diff --git a/.gitignore b/.gitignore
index 357250f..6050722 100644
--- a/.gitignore
+++ b/.gitignore
@@ -55,3 +55,6 @@ dkms.conf
 # Other
 *.txt
 build/
+debug
+.tests
+.old
diff --git a/Makefile b/Makefile
index 3382f8d..e358daf 100644
--- a/Makefile
+++ b/Makefile
@@ -1,64 +1,93 @@
 #!/usr/bin/make -f
-# ---
-#	Project: FIXME WRITE DOC !!
-#	Author: yann.magnin@epitech.eu
-# ---
-include global.mk
+## ---
+##	Project: sprite-coder
+##	Author:
+##		theo.cousinet@epitech.eu
+##		yann.magnin@epitech.eu
+## ---
 
-NAME	:= vhex
-EXEC	:= $(NAME).g1a
-HEADER	:= -Iinclude
-DEBUG	:= link_map.txt
-LDFLAG	:= -T bootstrap.ld
-ICON	:= icon.bmp
-BUILD	:= build/
+##---
+##	Static variables
+##--
+HEADER		:= include
+BUILD		:= build
+DEBUG		:= debug
+
+NAME		:= vhex
+EXEC		:= $(NAME).g1a
+LDFLAG		:= -T $(NAME).ld
+MEMORY_MAP	:= $(DEBUG)/$(NAME).map
+ICON		:= icon.bmp
 
 
+COMPILER	:= sh3eb-elf-
+CC		:= $(COMPILER)gcc
+OBJCOPY		:= $(COMPILER)objcopy
+WRAPPER		:= g1a-wrapper
+CFLAGS		:= -Werror -Wall -W -Wextra -std=c18 -m3 -mb -mrenesas \
+			-ffreestanding -nostdlib -fstrict-volatile-bitfields \
+			-Wno-unused-const-variable -Wno-unused-function \
+			-Wno-unused-variable -Wno-unused-but-set-variable \
+			-Wno-unused-parameter
+
+
+red		:= \033[1;31m
+green		:= \033[1;32m
+blue		:= \033[1;34m
+white		:= \033[1;37m
+nocolor		:= \033[1;0m
+
+
+
+
+##---
+##	Automated variables
+##---
 SRC		:=
-DIRECTORY	:= src/ $(sort $(dir $(wildcard src/*/*/)))
+DIRECTORY	:= $(shell find src -not -path "*/\.*" -type d)
+# Get all source files
 $(foreach path,$(DIRECTORY),$(eval		\
-	SRC	+= $(wildcard $(path)*.c) 	\
-			$(wildcard $(path)*.s)	\
-			$(wildcard $(path)*.S))	\
-)
-OBJ	:= $(patsubst src_%,$(BUILD)%.o,$(subst /,_,$(basename $(SRC))))
+	SRC	+= $(wildcard $(path)/*.c)	\
+			$(wildcard $(path)/*.S)	\
+			$(wildcard $(path)/*.s)	\
+))
+# Geneate all object files
+OBJ	:= $(patsubst %,$(BUILD)/%.o,$(subst /,_,$(subst src/,,$(basename $(SRC)))))
 
-#all: ;@echo $(SRC) $(OBJ)
-all: | $(BUILD) $(EXEC)
 
-install: $(EXEC)
-	sudo p7 send $<
+
+
+##---
+##	General rules
+##---
+all: | $(BUILD) $(DEBUG) $(EXEC)
 
 $(EXEC): $(OBJ)
-	@ printf "$(green)/-------\n/  Link files\n/-------$(nocolor)\n"
-	$(CC) -Wl,-M $(LDFLAG) $(CFLAGS) -o $(BUILD)$(NAME).elf $^ $(HEADER) -lgcc > $(DEBUG)
-	$(OBJCPY) -R .comment -R .bss -O binary $(BUILD)$(NAME).elf $(BUILD)$(NAME).bin
-	$(WRAPPER) $(BUILD)$(NAME).bin -o $@ -i $(ICON)
+	$(CC) -Wl,-M $(LDFLAG) $(CFLAGS) -o $(DEBUG)/$(NAME).elf $(OBJ) -I $(HEADER) -lgcc > $(MEMORY_MAP)
+	$(OBJCOPY) -R .comment -R .bss -O binary $(DEBUG)/$(NAME).elf $(DEBUG)/$(NAME).bin
+	$(WRAPPER) $(DEBUG)/$(NAME).bin -o $@ -i $(ICON)
 
-$(BUILD):
+$(BUILD) $(DEBUG):
 	@ printf "Create $(blue)$@$(nocolor) directory\n"
 	@ mkdir -p $@
 
+install: $(EXEC)
+	sudo p7 send --force $^
 
-#
-# TODO: find better way to do the job
-# Units tests part.
-#
-tests:
-	gcc -std=c11 -Wall -Wno-error=deprecated-declarations -Wno-deprecated-declarations \
-	-Werror -D DEBUG -o unit_tests $(HEADER) -I. src/history.c src/string/strtotab.c \
-	src/string/atoi_base.c $(wildcard tests/*.c) --coverage -lcriterion
-	./unit_tests
-	gcovr --exclude tests/ --branches
-	rm *.gc*
-	rm ./unit_tests
+check:
+	@ echo 'src: $(SRC)'
+	@ echo 'obj: $(OBJ)'
+	@ echo 'directory: $(DIRECTORY)'
 
 
 
+##---
+##	  Automated rules
+##---
 define rule-src
-$(patsubst src_%,$(BUILD)%.o,$(subst /,_,$(basename $1))): $1
+$(patsubst %,$(BUILD)/%.o,$(subst /,_,$(subst src/,,$(basename $1)))): $1
 	@ printf "compiling $(white)$$<$(nocolor)..."
-	@ $(CC) $(CFLAGS) -o $$@ -c $$< $(HEADER) -lgcc
+	@ $(CC) $(CFLAGS) -o $$@ -c $$< -I $(HEADER) -lgcc
 	@ printf "$(green)[ok]$(nocolor)\n"
 endef
 
@@ -67,19 +96,16 @@ $(foreach source,$(SRC),$(eval		\
 )
 
 
-#---
-#	Clean rules
-#---
+
+
+##---
+##	Cleaning rules
+##---
 clean:
-	@ printf "$(red)Delete objects files$(nocolor)\n"
 	rm -rf $(BUILD)
-	rm -f *.gc*
-	rm -f $(DEBUG)
-	rm -f $(NAME).bin
-	rm -f $(NAME).elf
+	rm -rf $(DEBUG)
 
 fclean: clean
-	@ printf "$(red)Delete binary files$(nocolor)\n"
 	rm -f $(EXEC)
 
 re: fclean all
@@ -87,4 +113,4 @@ re: fclean all
 
 
 
-.PHONY: clean re fclean install tests
+.PHONY: re fclean clean all install
diff --git a/bootstrap.ld b/bootstrap.ld
deleted file mode 100644
index 042fae1..0000000
--- a/bootstrap.ld
+++ /dev/null
@@ -1,52 +0,0 @@
-OUTPUT_ARCH(sh3)
-OUTPUT_FORMAT(elf32-sh)
-ENTRY(_initialize)
-
-MEMORY
-{
-	rom	: o = 0x00300200, l = 512k
-	ram	: o = 0x08100000, l = 8k
-}
-
-SECTIONS
-{
-	. = ORIGIN(rom);
-	.pretext : {
-		*(.pretext.entry)
-		*(.pretext)
-	} > rom
-
-	.text	: {
-		*(.text)
-	} > rom
-
-	.rodata	: SUBALIGN(4) {
-		*(.rodata)
-		. = ALIGN(4);
-		_bcmd_cache = . ;
-		*(.cmd.cache)
-		_ecmd_cache = . ;
-	} > rom
-
-
-	. = ORIGIN(ram);
-	.bss (NOLOAD) : {
-		_bbss = . ;
-		*(.bss)
-		*(COMMON)
-	} > ram : NONE
-	_sbss = SIZEOF(.bss);
-
-	.data ALIGN(4) : ALIGN(4) {
-		_bdata_rom = LOADADDR(.data) ;
-		_bdata_ram = . ;
-		*(.data)
-	} > ram AT> rom
-	_sdata = SIZEOF(.data) ;
-
-	/* unused sections */
-	/DISCARD/ : {
-		*(.comment)
-		*(.comment.*)
-	}
-}
diff --git a/global.mk b/global.mk
deleted file mode 100644
index aff5d7f..0000000
--- a/global.mk
+++ /dev/null
@@ -1,28 +0,0 @@
-# Global options, used in each Makefile in the project
-# If you have to change a tool name, or to add an option
-# for every part of the project, this is the good place.
-
-COMPILER	:= sh3eb-elf-
-CC		:= $(COMPILER)gcc
-OBJCPY		:= $(COMPILER)objcopy
-AR		:= $(COMPILER)ar
-LD		:= $(COMPILER)ld
-WRAPPER		:= g1a-wrapper
-
-CFLAGS		:= -Werror -Wall -W -Wextra -std=c18 -m3 -mb -mrenesas \
-			-ffreestanding -nostdlib -fstrict-volatile-bitfields \
-			-Wno-unused-const-variable
-
-BUILD-DIR	:= build/
-SRC-DIR		:= src/
-
-red		:= \033[1;31m
-green		:= \033[1;32m
-blue		:= \033[1;34m
-white		:= \033[1;37m
-nocolor		:= \033[1;0m
-
-define n
-# Force new line character
-
-endef
diff --git a/include/kernel/atomic.h b/include/kernel/atomic.h
new file mode 100644
index 0000000..f6c56c6
--- /dev/null
+++ b/include/kernel/atomic.h
@@ -0,0 +1,10 @@
+#ifndef __KERNEL_ATOMIC_H__
+# define __KERNEL_ATOMIC_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+extern void atomic_start(void);
+extern void atomic_end(void);
+
+#endif /*__KERNEL_ATOMIC_H__*/
diff --git a/include/kernel/attributes.h b/include/kernel/attributes.h
new file mode 100644
index 0000000..ba0890b
--- /dev/null
+++ b/include/kernel/attributes.h
@@ -0,0 +1,9 @@
+#ifndef __KERNEL_ARCH_ATTRIBUTES_H__
+# define __KERNEL_ARCH_ATTRIBUTES_H__
+
+// Generate "anonyme name" for each gaps.
+#define gap_name2(name)	_##name
+#define gap_name(name)	gap_name2(name)
+#define GAPS(bytes)	const uint8_t gap_name(__LINE__)[bytes]
+
+#endif /*__KERNEL_ARCH_ATTRIBUTES_H__*/
diff --git a/include/kernel/context.h b/include/kernel/context.h
new file mode 100644
index 0000000..f89e0d7
--- /dev/null
+++ b/include/kernel/context.h
@@ -0,0 +1,40 @@
+#ifndef __KERNEL_CONTEXT_H__
+# define __KERNEL_CONTEXT_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+typedef struct fx9860_context_s
+{
+	struct {
+		uint16_t control;
+		uint16_t autofix;
+		uint16_t scan_mode;
+		uint16_t scan_state;
+		uint16_t interrupt;
+		uint16_t scan_wait;
+		uint16_t scan_interval;
+		uint16_t kyoutdr;
+		uint16_t kyindr;
+	} keyboard;
+	struct {
+		uint16_t ipra;
+		uint16_t iprb;
+		uint16_t iprc;
+		uint16_t iprd;
+		uint16_t ipre;
+		uint16_t iprf;
+		uint16_t iprg;
+		uint16_t iprh;
+		uint16_t ipri;
+		uint16_t iprj;
+		uint16_t iprk;
+		uint16_t iprl;
+	} intc;
+} fx9860_context_t;
+
+// Context primitive.
+extern void fx9860_context_save(fx9860_context_t *context);
+extern void fx9860_context_restore(fx9860_context_t *context);
+
+#endif /*__KERNEL_CONTEXT_H__*/
diff --git a/include/kernel/hardware/intc.h b/include/kernel/hardware/intc.h
new file mode 100644
index 0000000..6d1fac1
--- /dev/null
+++ b/include/kernel/hardware/intc.h
@@ -0,0 +1,514 @@
+#ifndef __KERNEL_MODULES_SH7724_INTC_H__
+# define __KERNEL_MODULES_SH7724_INTC_H__
+
+#include <stdint.h>
+#include <stddef.h>
+#include <kernel/union_types.h>
+#include <kernel/attributes.h>
+
+struct SH7305_intc_s
+{
+	//---
+	// Interrupt priority register.
+	//---
+	volatile word_union(IPRA,
+		uint8_t TMU0_0	: 4;	/* Timer 0 */
+		uint8_t TMU0_1	: 4;	/* Timer 1 */
+		uint8_t TMU0_2	: 4;	/* Timer 2 */
+		uint8_t IrDA	: 4;	/* Infrared Communication */
+	);
+	GAPS(2);
+	volatile word_union(IPRB,
+		uint8_t const	: 4;
+		uint8_t LCDC	: 4;	/* LCD Controller */
+		uint8_t DMAC1A	: 4;	/* Direct Memory Controller 1 */
+		uint8_t const	: 4;
+	);
+	GAPS(2);
+	volatile word_union(IPRC,
+		uint8_t TMU1_0	: 4;	/* TMU1 Channel 0 */
+		uint8_t TMU1_1	: 4;	/* TMU1 Channel 1 */
+		uint8_t TMU1_2	: 4;	/* TMU1 Channel 2 */
+		uint8_t const	: 4;
+	);
+	GAPS(2);
+	volatile word_union(IPRD,
+		uint8_t const	: 4;
+		uint8_t MMCIF	: 4;	/* MultiMedia Card Interface */
+		uint8_t const	: 4;
+		uint8_t const	: 4;
+	);
+	GAPS(2);
+	volatile word_union(IPRE,
+		uint8_t DMAC0A	: 4;	/* Direct Memory Controller 1 */
+		uint8_t const	: 4;
+		uint8_t const	: 4;	/* Extra TMU ?? */
+		uint8_t const	: 4;
+	);
+	GAPS(2);
+	volatile word_union(IPRF,
+		uint8_t KEYSC	: 4;	/* Key Scan Interface */
+		uint8_t DMAC0B	: 4;	/* Direct Memory transfer / error info */
+		uint8_t USB0_1	: 4;	/* USB Controller */
+		uint8_t CMT	: 4;	/* Compare Match Timer*/
+	);
+	GAPS(2);
+	volatile word_union(IPRG,
+		uint8_t SCIF0	: 4;	/* SCIF0 transfert / error info */
+		uint8_t const	: 4;	/* Extra TMU ?? */
+		uint8_t const	: 4;	/* Extra TMU ?? */
+		uint8_t const	: 4;
+	);
+	GAPS(2);
+	volatile word_union(IPRH,
+		uint8_t MSIOF0	: 4;	/* Clock-synchronized SCIF channel 0 */
+		uint8_t MSIOF1	: 4;	/* Clock-synchronized SCIF channel 1 */
+		uint8_t const	: 4;
+		uint8_t const	: 4;
+	);
+	GAPS(2);
+	volatile word_union(IPRI,
+		uint8_t const	: 4;	/* Extra TMU ?? */
+		uint8_t const	: 4;
+		uint8_t const	: 4;
+		uint8_t const	: 4;
+	);
+	GAPS(2);
+	volatile word_union(IPRJ,
+		uint8_t const	: 4;	/* Extra TMU ?? */
+		uint8_t const	: 4;
+		uint8_t FSI	: 4;	/* FIFO - buffered Serial Interface */
+		uint8_t SDHI1	: 4;	/* SD Card Host channel 1 */
+	);
+	GAPS(2);
+	volatile word_union(IPRK,
+		uint8_t RTC	: 4;	/* Real Time Clock */
+		uint8_t DMAC1B	: 4;	/* DMAC1 transfer/error info */
+		uint8_t const	: 4;
+		uint8_t SDHI0	: 4;	/* SD Card Host channel 0 */
+	);
+	GAPS(2);
+	volatile word_union(IPRL,
+		uint8_t const	: 4;	/* Extra TMU ?? */
+		uint8_t const	: 4;
+		uint8_t TPU	: 4;	/* Timer-Pulse Unit */
+		uint8_t const	: 4;
+	);
+	GAPS(0x52);
+
+
+	//---
+	// Interrupt mask register.
+	// FIXME
+	// This is the SH7224 Interrupt mask registers, so find
+	// the interrupt mask regiters for the SH7305.
+	//---
+	volatile byte_union(IMR0,
+		uint8_t const	: 1;
+		uint8_t TUNI2	: 1;	/* TMU1 (timer2) */
+		uint8_t TUNI1	: 1;	/* TMU1 (timer1) */
+		uint8_t TUNI0	: 1;	/* TMU1 (timer0) */
+		uint8_t SDHII3	: 1;	/* SDHI1 */
+		uint8_t SDHII2	: 1;	/* SDHI1 */
+		uint8_t SDHII1	: 1;	/* SDHI1 */
+		uint8_t SDHII0	: 1;	/* SDHI1 */
+	);
+	GAPS(3);
+	volatile byte_union(IMR1,
+		uint8_t VOUI	: 1;	/* VIO */
+		uint8_t VEU1I	: 1;	/* VIO */
+		uint8_t BEU0I	: 1;	/* VIO */
+		uint8_t CEU0I	: 1;	/* VIO */
+		uint8_t DEI3	: 1;	/* DMAC0A */
+		uint8_t DEI2	: 1;	/* DMAC0A */
+		uint8_t DEI1	: 1;	/* DMAC0A */
+		uint8_t DEI0	: 1;	/* DMAC0A */
+	);
+	GAPS(3);
+	volatile byte_union(IMR2,
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t VPUI	: 1;	/* VPU */
+		uint8_t ATAPI	: 1;	/* ATAPI */
+		uint8_t EtherMAC: 1;	/* Ether */
+		uint8_t const	: 1;
+		uint8_t SCIFA0	: 1;	/* SCIFA0 */
+	);
+	GAPS(3);
+	volatile byte_union(IMR3,
+		uint8_t DEI3	: 1;	/* DMAC1A */
+		uint8_t DEI2	: 1;	/* DMAC1A */
+		uint8_t DEI1	: 1;	/* DMAC1A */
+		uint8_t DEI0	: 1;	/* DMAC1A */
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t IRDAI	: 1;	/* IrDA */
+	);
+	GAPS(3);
+	volatile byte_union(IMR4,
+		uint8_t const	: 1;
+		uint8_t TUNI2	: 1;	/* TMU0 (timer2) */
+		uint8_t TUNI1	: 1;	/* TMU0 (timer1) */
+		uint8_t TUNI0	: 1;	/* TMU0 (timer0) */
+		uint8_t JPUI	: 1;	/* JPU */
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t LCDCI	: 1;	/* LCDC */
+	);
+	GAPS(3);
+	volatile byte_union(IMR5,
+		uint8_t KEYI	: 1;	/* KEYSC */
+		uint8_t DADERR	: 1;	/* DMAC0B */
+		uint8_t DEI5	: 1;	/* DMAC0B */
+		uint8_t DEI4	: 1;	/* DMAC0B */
+		uint8_t VEU0I	: 1;	/* VEU3F0 */
+		uint8_t SCIF2	: 1;	/* SCIF */
+		uint8_t SCIF1	: 1;	/* SCIF */
+		uint8_t SCIF0	: 1;	/* SCIF */
+	);
+	GAPS(3);
+	volatile byte_union(IMR6,
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t ICBI	: 1;	/* ICB */
+		uint8_t SCIFA4	: 1;	/* SCIFA4 */
+		uint8_t CEU1I	: 1;	/* CEU1 */
+		uint8_t const	: 1;
+		uint8_t MSIOFI1	: 1;	/* MSIOF */
+		uint8_t MSIOFI0	: 1;	/* MSIOF */
+	);
+	GAPS(3);
+	volatile byte_union(IMR7,
+		uint8_t DTE0I	: 1;	/* I2C0 */
+		uint8_t WAITT0I	: 1;	/* I2C0 */
+		uint8_t TACK0I	: 1;	/* I2C0 */
+		uint8_t AL0I	: 1;	/* I2C0 */
+		uint8_t DTE1I	: 1;	/* I2C1 */
+		uint8_t WAITT1I	: 1;	/* I2C1 */
+		uint8_t TACK1I	: 1;	/* I2C1 */
+		uint8_t AL1I	: 1;	/* I2C1 */
+	);
+	GAPS(3);
+	volatile byte_union(IMR8,
+		uint8_t SDHII3	: 1;	/* SDHI0 */
+		uint8_t SDHII2	: 1;	/* SDHI0 */
+		uint8_t SDHII1	: 1;	/* SDHI0 */
+		uint8_t SDHII0	: 1;	/* SDHI0 */
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t SCIFA5	: 1;	/* SCIFA5 */
+		uint8_t FSI	: 1;	/* FSI */
+	);
+	GAPS(3);
+	volatile byte_union(IMR9,
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t CMTI	: 1;	/* CMT */
+		uint8_t const	: 1;
+		uint8_t USI1	: 1;	/* USB */
+		uint8_t USI0	: 1;	/* USB */
+		uint8_t const	: 1;
+	);
+	GAPS(3);
+	volatile byte_union(IMR10,
+		uint8_t const	: 1;
+		uint8_t DADERR	: 1;	/* DMAC1B */
+		uint8_t DEI5	: 1;	/* DMAC1B */
+		uint8_t DEI4	: 1;	/* DMAC1B */
+		uint8_t const	: 1;
+		uint8_t ATI	: 1;	/* RTC */
+		uint8_t PRI	: 1;	/* RTC */
+		uint8_t CUI	: 1;	/* RTC */
+	);
+	GAPS(3);
+	volatile byte_union(IMR11,
+		uint8_t BRK	: 1;	/* 2DG */
+		uint8_t CEI	: 1;	/* 2DG */
+		uint8_t INI	: 1;	/* 2DG */
+		uint8_t TRI	: 1;	/* 2DG */
+		uint8_t const	: 1;
+		uint8_t TPUI	: 1;	/* TPU */
+		uint8_t LMBI	: 1;	/* ICB */
+		uint8_t TSIFI	: 1;	/* TSIF */
+	);
+	GAPS(3);
+	volatile byte_union(IMR12,
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t _2DDMAC	: 1;	/* 2DDMAC */
+	);
+	GAPS(15);
+
+	
+	//---
+	// Interrupt clear mask register.
+	// FIXME
+	// This is the SH7224 Interrupt mask registers, so find
+	// the interrupt mask regiters for the SH7305.
+	//---
+	volatile byte_union(IMCR0,
+		uint8_t const	: 1;
+		uint8_t TUNI2	: 1;	/* TMU1 (timer2) */
+		uint8_t TUNI1	: 1;	/* TMU1 (timer1) */
+		uint8_t TUNI0	: 1;	/* TMU1 (timer0) */
+		uint8_t SDHII3	: 1;	/* SDHI1 */
+		uint8_t SDHII2	: 1;	/* SDHI1 */
+		uint8_t SDHII1	: 1;	/* SDHI1 */
+		uint8_t SDHII0	: 1;	/* SDHI1 */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR1,
+		uint8_t VOUI	: 1;	/* VIO */
+		uint8_t VEU1I	: 1;	/* VIO */
+		uint8_t BEU0I	: 1;	/* VIO */
+		uint8_t CEU0I	: 1;	/* VIO */
+		uint8_t DEI3	: 1;	/* DMAC0A */
+		uint8_t DEI2	: 1;	/* DMAC0A */
+		uint8_t DEI1	: 1;	/* DMAC0A */
+		uint8_t DEI0	: 1;	/* DMAC0A */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR2,
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t VPUI	: 1;	/* VPU */
+		uint8_t ATAPI	: 1;	/* ATAPI */
+		uint8_t EtherMAC: 1;	/* Ether */
+		uint8_t const	: 1;
+		uint8_t SCIFA0	: 1;	/* SCIFA0 */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR3,
+		uint8_t DEI3	: 1;	/* DMAC1A */
+		uint8_t DEI2	: 1;	/* DMAC1A */
+		uint8_t DEI1	: 1;	/* DMAC1A */
+		uint8_t DEI0	: 1;	/* DMAC1A */
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t IRDAI	: 1;	/* IrDA */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR4,
+		uint8_t const	: 1;
+		uint8_t TUNI2	: 1;	/* TMU0 (timer2) */
+		uint8_t TUNI1	: 1;	/* TMU0 (timer1) */
+		uint8_t TUNI0	: 1;	/* TMU0 (timer0) */
+		uint8_t JPUI	: 1;	/* JPU */
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t LCDCI	: 1;	/* LCDC */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR5,
+		uint8_t KEYI	: 1;	/* KEYSC */
+		uint8_t DADERR	: 1;	/* DMAC0B */
+		uint8_t DEI5	: 1;	/* DMAC0B */
+		uint8_t DEI4	: 1;	/* DMAC0B */
+		uint8_t VEU0I	: 1;	/* VEU3F0 */
+		uint8_t SCIF2	: 1;	/* SCIF */
+		uint8_t SCIF1	: 1;	/* SCIF */
+		uint8_t SCIF0	: 1;	/* SCIF */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR6,
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t ICBI	: 1;	/* ICB */
+		uint8_t SCIFA4	: 1;	/* SCIFA4 */
+		uint8_t CEU1I	: 1;	/* CEU1 */
+		uint8_t const	: 1;
+		uint8_t MSIOFI1	: 1;	/* MSIOF */
+		uint8_t MSIOFI0	: 1;	/* MSIOF */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR7,
+		uint8_t DTE0I	: 1;	/* I2C0 */
+		uint8_t WAITT0I	: 1;	/* I2C0 */
+		uint8_t TACK0I	: 1;	/* I2C0 */
+		uint8_t AL0I	: 1;	/* I2C0 */
+		uint8_t DTE1I	: 1;	/* I2C1 */
+		uint8_t WAITT1I	: 1;	/* I2C1 */
+		uint8_t TACK1I	: 1;	/* I2C1 */
+		uint8_t AL1I	: 1;	/* I2C1 */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR8,
+		uint8_t SDHII3	: 1;	/* SDHI0 */
+		uint8_t SDHII2	: 1;	/* SDHI0 */
+		uint8_t SDHII1	: 1;	/* SDHI0 */
+		uint8_t SDHII0	: 1;	/* SDHI0 */
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t SCIFA5	: 1;	/* SCIFA5 */
+		uint8_t FSI	: 1;	/* FSI */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR9,
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t CMTI	: 1;	/* CMT */
+		uint8_t const	: 1;
+		uint8_t USI1	: 1;	/* USB */
+		uint8_t USI0	: 1;	/* USB */
+		uint8_t const	: 1;
+	);
+	GAPS(3);
+	volatile byte_union(IMCR10,
+		uint8_t const	: 1;
+		uint8_t DADERR	: 1;	/* DMAC1B */
+		uint8_t DEI5	: 1;	/* DMAC1B */
+		uint8_t DEI4	: 1;	/* DMAC1B */
+		uint8_t const	: 1;
+		uint8_t ATI	: 1;	/* RTC */
+		uint8_t PRI	: 1;	/* RTC */
+		uint8_t CUI	: 1;	/* RTC */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR11,
+		uint8_t BRK	: 1;	/* 2DG */
+		uint8_t CEI	: 1;	/* 2DG */
+		uint8_t INI	: 1;	/* 2DG */
+		uint8_t TRI	: 1;	/* 2DG */
+		uint8_t const	: 1;
+		uint8_t TPUI	: 1;	/* TPU */
+		uint8_t LMBI	: 1;	/* ICB */
+		uint8_t TSIFI	: 1;	/* TSIF */
+	);
+	GAPS(3);
+	volatile byte_union(IMCR12,
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t const	: 1;
+		uint8_t _2DDMAC	: 1;	/* 2DDMAC */
+	);
+	GAPS(0xbff0e);
+
+	//---
+	//	Interrupt Control registers 0
+	//---
+	volatile word_union(ICR0,
+		uint8_t NMIL	:1;	/* Non Maskable Interrupt Input level */
+		uint8_t MAI	:1;	/* Non Maskable Interrupt interrupt Mask */
+		uint8_t const	:4;	/* All 0 */
+		uint8_t NMIB	:1;	/* Non Maskable Interrupt Block Mode */
+		uint8_t NMIE	:1;	/* Non Maskable Interrupt Edge Select */
+		uint8_t const	:2;	/* All 1 */
+		uint8_t LVLMODE	:1;	/* Interrupt Source Retention Mode */
+		uint8_t const	:5;	/* All 0 */
+	);
+	GAPS(0x0e);
+	
+
+	//---
+	//	Interrupt Priority registers
+	//---
+	volatile long_union(INTPRI00,
+		uint32_t IRQ0	: 4;	/* Interrupt Request 0 */
+		uint32_t IRQ1	: 4;	/* Interrupt Request 1 */
+		uint32_t IRQ2	: 4;	/* Interrupt Request 2 */
+		uint32_t IRQ3	: 4;	/* Interrupt Request 3 */
+		uint32_t IRQ4	: 4;	/* Interrupt Request 4 */
+		uint32_t IRQ5	: 4;	/* Interrupt Request 5 */
+		uint32_t IRQ6	: 4;	/* Interrupt Request 6 */
+		uint32_t IRQ7	: 4;	/* Interrupt Request 7 */
+	);
+	GAPS(8);
+
+	//---
+	//	Interrupt Control register 1
+	//---
+	volatile word_union(ICR1,
+		uint8_t IRQ0S	:2;	/* Interrupt Request 0 Sense Select */
+		uint8_t IRQ1S	:2;	/* Interrupt Request 1 Sense Select */
+		uint8_t IRQ2S	:2;	/* Interrupt Request 2 Sense Select */
+		uint8_t IRQ3S	:2;	/* Interrupt Request 3 Sense Select */
+		uint8_t IRQ4S	:2;	/* Interrupt Request 4 Sense Select */
+		uint8_t IRQ5S	:2;	/* Interrupt Request 5 Sense Select */
+		uint8_t IRQ6S	:2;	/* Interrupt Request 6 Sense Select */
+		uint8_t IRQ7S	:2;	/* Interrupt Request 7 Sense Select */
+	);
+	GAPS(6);
+
+	//---
+	//	Interrupt request register.
+	//---
+	volatile byte_union(INTREQ00,
+		uint8_t IRQ0	: 1;	/* Interrupt Request 0 */
+		uint8_t IRQ1	: 1;	/* Interrupt Request 1 */
+		uint8_t IRQ2	: 1;	/* Interrupt Request 2 */
+		uint8_t IRQ3	: 1;	/* Interrupt Request 3 */
+		uint8_t IRQ4	: 1;	/* Interrupt Request 4 */
+		uint8_t IRQ5	: 1;	/* Interrupt Request 5 */
+		uint8_t IRQ6	: 1;	/* Interrupt Request 6 */
+		uint8_t IRQ7	: 1;	/* Interrupt Request 7 */
+	);
+	GAPS(0x1f);
+
+	//---
+	//	Interrupt mask register.
+	//---
+	volatile byte_union(INTMSK00,
+		uint8_t IRQ0	: 1;	/* Interrupt Request 0 */
+		uint8_t IRQ1	: 1;	/* Interrupt Request 1 */
+		uint8_t IRQ2	: 1;	/* Interrupt Request 2 */
+		uint8_t IRQ3	: 1;	/* Interrupt Request 3 */
+		uint8_t IRQ4	: 1;	/* Interrupt Request 4 */
+		uint8_t IRQ5	: 1;	/* Interrupt Request 5 */
+		uint8_t IRQ6	: 1;	/* Interrupt Request 6 */
+		uint8_t IRQ7	: 1;	/* Interrupt Request 7 */
+	);
+	GAPS(0x1f);
+
+	//---
+	//	Interrupt mask clear register. (write only).
+	//---
+	volatile byte_union(INTMSKCLR00,
+		uint8_t IRQ0	: 1;	/* Interrupt Request 0 */
+		uint8_t IRQ1	: 1;	/* Interrupt Request 1 */
+		uint8_t IRQ2	: 1;	/* Interrupt Request 2 */
+		uint8_t IRQ3	: 1;	/* Interrupt Request 3 */
+		uint8_t IRQ4	: 1;	/* Interrupt Request 4 */
+		uint8_t IRQ5	: 1;	/* Interrupt Request 5 */
+		uint8_t IRQ6	: 1;	/* Interrupt Request 6 */
+		uint8_t IRQ7	: 1;	/* Interrupt Request 7 */
+	);
+	GAPS(0x5b);
+
+	//---
+	//	Non Maskable Interrupt flags control register
+	//---
+	volatile word_union(NMIFCR,
+		uint16_t const NMIL	: 1;	/* NMI input Level */
+		uint16_t const		: 14;	/* All 0 */
+		uint16_t NMIFL		: 1;	/* NMI Interrupt Request Detection */
+	);
+	GAPS(0x5bff3e);
+
+	//---
+	//	User interrupt mask level register.
+	//---
+	volatile long_union(USERMSK,
+		uint32_t SECRET	: 8;	/* Only write 0xa5 */
+		uint32_t const	: 8;	/* All 0 */
+		uint32_t UIMASK	: 4;	/* User Interrupt Mask Level */
+		uint32_t const	: 4;	/* All 0 */
+	);
+};
+
+#define SH7305_INTC	(*(volatile struct SH7305_intc_s	*)0xa4080000)
+#endif /*__KERNEL_MODULES_SH7724_INTC_H__*/
diff --git a/include/kernel/hardware/keysc.h b/include/kernel/hardware/keysc.h
new file mode 100644
index 0000000..f6ea2e3
--- /dev/null
+++ b/include/kernel/hardware/keysc.h
@@ -0,0 +1,66 @@
+#ifndef __KERNEL_MODULES_SH7724_KEYSC_H__
+# define __KERNEL_MODULES_SH7724_KEYSC_H__
+
+#include <stdint.h>
+#include <stddef.h>
+#include <kernel/union_types.h>
+#include <kernel/attributes.h>
+
+struct sh7305_keysc_s
+{
+	volatile const uint16_t KIUDATA[6];
+	volatile word_union(CONTROL,
+		uint16_t KEYIE		: 1;	/* Key Interrupt enable */
+		uint16_t const		:13;	/* All 0 */
+		uint16_t INTMODE	: 2;	/* Key Interrupt mode (?) */
+	);
+	volatile word_union(AUTOFIX,
+		uint16_t ENABLE		: 1;	/* enable AUTOFIX (?) */
+		uint16_t const		: 8;	/* All 0 */
+		uint16_t UNKNOWN0	: 3;	/* ????? */
+		uint16_t const		: 1;	/* All 0 */
+		uint16_t UNKNOWN1	: 3;	/* ????? */
+	);
+	volatile word_union(SCAN_MODE,
+		uint16_t UNKNOWN0	: 3;	/* Scan Timing (?) */
+		uint16_t UNKNOWN1	: 3;	/* Scan mode (?) */
+		uint16_t const		: 10;	/* All 0 */
+	);
+	volatile word_union(SCAN_STATE,
+		uint16_t const		:15;	/* All 0 */
+		uint16_t STATE		: 1;	/* ????? */
+	);
+	volatile word_union(INTERRUPT,
+		uint16_t const		: 1;	/* All 0 */
+		uint16_t KYCPU_IE	: 7;	/* KEYSC interrupt setup (see Planet Casio's bible) */
+		uint16_t const STATUS	: 8;	/* Indicate the "type" of interruption (pressed, released, etc) */
+	);
+	volatile word_union(SCAN_WAIT,
+		uint16_t const		: 1;	/* All 0 */
+		uint16_t TIME		:15;	/* Time between interrupt */
+	);
+	volatile uint16_t SCAN_INTERVAL;
+	volatile word_union(KYOUTDR,
+		uint16_t const		: 4;	/* All 0 */
+		uint16_t KYO5DT		: 2;	/* Key Controll ouput 5 */
+		uint16_t KYO4DT		: 2;	/* Key Controll ouput 4 */
+		uint16_t KYO3DT		: 2;	/* Key Controll ouput 3 */
+		uint16_t KYO2DT		: 2;	/* Key Controll ouput 2 */
+		uint16_t KYO1DT		: 2;	/* Key Controll ouput 1 */
+		uint16_t KYO0DT		: 2;	/* Key Controll ouput 0 */
+	);
+	volatile word_union(KYINDR,
+		uint16_t const		: 8;	/* All 0 */
+		uint16_t KYDIR6		: 1;	/* Key Direction 6 */
+		uint16_t KYDIR5		: 1;	/* Key Direction 5 */
+		uint16_t KYDIR4		: 1;	/* Key Direction 4 */
+		uint16_t KYDIR3		: 1;	/* Key Direction 3 */
+		uint16_t KYDIR2		: 1;	/* Key Direction 2 */
+		uint16_t KYDIR1		: 1;	/* Key Direction 1 */
+		uint16_t KYDIR0		: 1;	/* Key Direction 0 */
+	);
+};
+
+#define SH7305_KEYSC	(*(volatile struct sh7305_keysc_s *)0xa44b0000)
+
+#endif /*__KERNEL_MODULES_SH7724_KEYSC_H__*/
diff --git a/include/kernel/hardware/t6k11.h b/include/kernel/hardware/t6k11.h
new file mode 100644
index 0000000..1010fea
--- /dev/null
+++ b/include/kernel/hardware/t6k11.h
@@ -0,0 +1,10 @@
+#ifndef __KERNEL_HARDWARE_T6K11_H__
+# define __KERNEL_HARDWARE_T6K11_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+// Screen primitive
+extern void t6k11_display(void *vram);
+
+#endif /*__KERNEL_HARDWARE_T6K11_H__*/
diff --git a/include/kernel/tty.h b/include/kernel/tty.h
new file mode 100644
index 0000000..57f224a
--- /dev/null
+++ b/include/kernel/tty.h
@@ -0,0 +1,25 @@
+#ifndef __KERNEL_TTY_H__
+# define __KERNEL_TTY_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+struct tty_s
+{
+	struct {
+		uint8_t x;
+		uint8_t y;
+		struct {
+			uint8_t x;
+			uint8_t y;
+		} max;
+	} cursor;
+};
+
+// primitives.
+extern int tty_open(void);
+extern int tty_write(char const *buffer, ...);
+//extern void tty_read(char *buffer, size_t count);
+extern int tty_close(void);
+
+#endif /*__KERNEL_TTY_H__*/
diff --git a/include/types.h b/include/kernel/types.h
similarity index 78%
rename from include/types.h
rename to include/kernel/types.h
index 3258831..6c30e36 100644
--- a/include/types.h
+++ b/include/kernel/types.h
@@ -16,6 +16,16 @@ typedef int32_t ssize_t;
 # define __ssize_t_defined
 #endif
 
+// Define MPU arch.
+typedef enum mpu_e
+{
+	MPU_SH7305,
+	MPU_SH7724,
+	MPU_SH7337,
+	MPU_SH7355,
+	MPU_UNKNOWN,
+} mpu_t;
+
 // Force inline function.
 #define INLINE	__attribute__((always_inline)) inline
 
diff --git a/include/kernel/union_types.h b/include/kernel/union_types.h
new file mode 100644
index 0000000..37cc0d3
--- /dev/null
+++ b/include/kernel/union_types.h
@@ -0,0 +1,32 @@
+#ifndef __KERNEL_MODULES_TYPES_H__
+# define __KERNEL_MODULES_TYPES_H__
+
+#include <stdint.h>
+#include <stddef.h>
+
+#define byte_union(name, fields)			\
+	union {						\
+		uint8_t BYTE;				\
+		struct {				\
+			fields				\
+		} __attribute__((packed, aligned(1)));	\
+	} __attribute__((packed, aligned(1))) name
+
+#define word_union(name, fields)			\
+	union {						\
+		uint16_t WORD;				\
+		struct {				\
+			fields				\
+		} __attribute__((packed, aligned(2)));	\
+	} __attribute__((packed, aligned(2))) name
+
+#define long_union(name, fields)			\
+	union {						\
+		uint32_t LONG_WORD;			\
+		struct {				\
+			fields				\
+		} __attribute__((packed, aligned(4)));	\
+	} __attribute__((packed, aligned(4))) name
+
+
+#endif /*__KERNEL_MODULES_TYPES_H__*/
diff --git a/include/lib/display.h b/include/lib/display.h
new file mode 100644
index 0000000..0238cef
--- /dev/null
+++ b/include/lib/display.h
@@ -0,0 +1,32 @@
+#ifndef __LIB_DISPLAY_H__
+# define __LIB_DISPLAY_H__
+
+#include <stddef.h>
+#include <stdint.h>
+
+
+// Define font bitmap informations.
+#define KERNEL_FONT_BITMAP_WIDTH	127	// Bitmap width
+#define KERNEL_FONT_BITMAP_HEIGHT	23	// Bitmap height
+#define KERNEL_FONT_BITMAP_CWIDTH	4	// Character width (bitmap)
+#define KERNEL_FONT_BITMAP_CHEIGHT	6	// Character height (bitmap)
+#define KERNEL_FONT_REAL_WIDTH		3	// Charater width (real)
+#define KERNEL_FONT_REAL_HEIGHT		5	// Character height (real)
+#define KERNEL_FONT_NB_CHAR_X		((KERNEL_FONT_BITMAP_WIDTH / KERNEL_FONT_BITMAP_CWIDTH) + 1)
+#define KERNEL_FONT_NB_CHAR_Y		((KERNEL_FONT_BITMAP_HEIGHT / KERNEL_FONT_BITMAP_CHEIGHT) + 1)
+
+// Define screen informations.
+#define DISPLAY_SCREEN_WIDTH	128
+#define DISPLAY_SCREEN_HEIGHT	64
+
+// Primtives
+extern void dclear(void);
+extern void dprint(int x, int y, char const *str, ...);
+extern void dascii(int x, int y, char const c);
+extern void dscroll(int line);
+extern void dupdate(void);
+
+// Sheared Video RAM
+extern uint32_t *VRAM;
+
+#endif /*__LIB_DISPLAY_H__*/
diff --git a/include/lib/stdio.h b/include/lib/stdio.h
new file mode 100644
index 0000000..c60de95
--- /dev/null
+++ b/include/lib/stdio.h
@@ -0,0 +1,12 @@
+#ifndef __LIB_STDIO_H__
+# define __LIB_STDIO_H__
+
+#include <stddef.h>
+#include <stdint.h>
+#include <stdarg.h>
+
+/* vsprintf(), sprintf() - formatted output conversion. */
+void vsprintf(char *str, char const *format, va_list ap);
+void sprintf(char *str, char const *format, ...);
+
+#endif /*__LIB_STDIO_H__*/
diff --git a/include/lib/string.h b/include/lib/string.h
new file mode 100644
index 0000000..7575735
--- /dev/null
+++ b/include/lib/string.h
@@ -0,0 +1,24 @@
+#ifndef __STRING_H__
+# define __STRING_H__
+
+#include <stdint.h>
+#include <stddef.h>
+
+/* memset() - fill memory with a constant byte. */
+void *memset(void *s, int c, size_t n);
+void *memcpy(void *dest, const void *src, size_t n);
+
+/* strcat() - concatenate two string */
+char *strcat(char *dest, char const *src);
+
+/* strcmp() - compare two strings */
+int strcmp(const char *s1, const char *s2);
+
+/* strcpy(), strncpy() - copy a string. */
+char *strncpy(char *dest, char const *str, size_t size);
+char *strcpy(char *dest, char const *src);
+
+/* strlen - calculate the lenght of a string. */
+size_t strlen(char const *str);
+
+#endif /*__STRING_H__*/
diff --git a/include/string.h b/include/string.h
deleted file mode 100644
index 2aeebf2..0000000
--- a/include/string.h
+++ /dev/null
@@ -1,46 +0,0 @@
-#ifndef __STRING_H__
-# define __STRING_H__
-
-#include <types.h>
-#include <stdarg.h>
-
-// Define weak symbols 
-#define WEAK __attribute__((weak))
-
-/* memset() - fill memory with a constant byte. */
-WEAK void *memset(void *s, int c, size_t n);
-
-#ifndef DEBUG
-/* vsprintf(), sprintf() - formatted output conversion. */
-void vsprintf(char *str, char const *format, va_list ap);
-void sprintf(char *str, char const *format, ...);
-#endif /* DEBUG */
-
-/* strcat() - concatenate two string */
-WEAK char *strcat(char *dest, char const *src);
-
-/* strcmp() - compare two strings */
-WEAK int strcmp(const char *s1, const char *s2);
-
-/* strcpy(), strncpy() - copy a string. */
-WEAK char *strncpy(char *dest, char const *str, size_t size);
-WEAK char *strcpy(char *dest, char const *src);
-
-/* strlen - calculate the lenght of a string. */
-WEAK size_t strlen(char const *str);
-
-
-
-//
-// Custom string function.
-//
-/* strtotab() - generate table of word and indicate the number of word. */
-int strtotab(int *argc, char ***argv, char const *str);
-
-/* strtotab_quit() - free all allocated memory by strtotab function. */
-void strtotab_quit(int *argc, char ***argv);
-
-/* atoi_base() - atoi wrapped function, but add the base number. */
-uint32_t atoi_base(char const *str, int base);
-
-#endif /*__STRING_H__*/
diff --git a/src/boot/crt0.c b/src/boot/crt0.c
deleted file mode 100644
index a354909..0000000
--- a/src/boot/crt0.c
+++ /dev/null
@@ -1,56 +0,0 @@
-#include <stdint.h>
-#include <stddef.h>
-extern int main(void);
-
-//defined by bootstrap.ld
-extern uint32_t bbss;
-extern uint32_t sbss;
-extern uint32_t bdata_rom;
-extern uint32_t bdata_ram;
-extern uint32_t sdata;
-
-
-//
-// section_dump()
-// copy a memory region using symbol information.
-//
-__attribute__((section(".pretext")))
-void section_dump(uint32_t * restrict dest, uint32_t * restrict load, size_t size)
-{
-	size_t i;
-
-	i = -1;
-	while (++i < size >> 2)
-		dest[i] = load[i];
-}
-
-//
-// section_reset()
-// clear a memory region using symbol information.
-//
-__attribute__((section(".pretext")))
-void section_reset(uint32_t *bsection, size_t size)
-{
-	size_t i;
-
-	i = -1;
-	while (++i < size >> 2)
-		bsection[i] = 0;
-}
-
-//
-// initialize() - the real add-in entry.
-// We are currently running in the storage memory, so we should
-// load data in RAM and wipe the bss section for initialize static
-// and global variables.
-//
-__attribute__((section(".pretext.entry")))
-int initialize(void)
-{
-	int exit;
-
-	section_reset(&bbss, (size_t)&sbss);
-	section_dump(&bdata_ram, &bdata_rom, (size_t)&sdata);
-	exit = main();
-	return (exit);
-}
diff --git a/src/commands/cache.c b/src/commands/cache.c
deleted file mode 100644
index e07726e..0000000
--- a/src/commands/cache.c
+++ /dev/null
@@ -1,30 +0,0 @@
-#include <command.h>
-#include <string.h>
-
-// External symbols defined by the linker script.
-extern uint32_t bcmd_cache;
-extern uint32_t ecmd_cache;
-
-//
-// cmd_cache_find()
-// Try to find the command into the command cache.
-//
-// NOTE:
-// The cache is generated during the compilation; all command
-// blocks is stored in the ".cmd.cache" section.
-// We use the section symbols to know where the cache end.
-// (see bootstrap.ld).
-//
-const struct cmd_block *cmd_cache_find(char const *name)
-{
-	const struct cmd_block *cache;
-	size_t i;
-	
-	i = -1;
-	cache = (void *)&bcmd_cache;
-	while ((ptrdiff_t)(&cache[++i]) != (ptrdiff_t)&ecmd_cache
-	&& strcmp(cache[i].name, name));
-	if ((ptrdiff_t)(&cache[i]) == (ptrdiff_t)&ecmd_cache)
-		return (NULL);
-	return (&cache[i]);
-}
diff --git a/src/commands/entry.c b/src/commands/entry.c
deleted file mode 100644
index e4a80fd..0000000
--- a/src/commands/entry.c
+++ /dev/null
@@ -1,57 +0,0 @@
-#include <command.h>
-#include <string.h>
-#include <errno.h>
-
-//
-// command_find
-// Try to find the user command in the internal cache and execute
-// the command's function.
-//
-static int command_find(int argc, char **argv, struct session_s *session,
-struct vhex_s *vhex)
-{
-	const struct cmd_block *command;
-	int tmp;
-
-	command = cmd_cache_find(*argv);
-	if (command == NULL)
-		return (EINVAL);
-	if (command->constructor == NULL){
-		strcpy(vhex->info, "function error");
-		return (ENOSYS);
-	}
-	tmp = session->anchor;
-	memset(vhex->info, '\0', CMD_LENGHT_MAX);
-	command->constructor(argc, argv, session, vhex->info);
-	if (*vhex->info == '\0')
-		sprintf(vhex->info, "%#x", session->anchor);
-	if (tmp != session->anchor)
-		session->cursor = 0;
-	return (0);
-}
-
-//
-// command_entry()
-// The goal of this part is to parse and execute the user's command.
-//
-void command_entry(struct session_s *session, struct vhex_s *vhex)
-{
-	char **argv;
-	int argc;
-	int ret;
-
-	if (history_update(&vhex->history.list, vhex->insert.cmd) == 0){
-		vhex->history.offset = 0;
-		vhex->history.deep += 1;
-	}
-	ret = strtotab(&argc, &argv, vhex->insert.cmd);
-	memset(vhex->insert.cmd, '\0', CMD_LENGHT_MAX);
-	if (ret != 0){
-		sprintf(vhex->info, "error (%d)", ret);
-		return;
-	}
-	if (command_find(argc, argv, session, vhex) != 0)
-		strcat(vhex->info, "command error");
-	session->mode = (session->anchor == 0x00000000) ? UNUSED : NORMAL;
-	strtotab_quit(&argc, &argv);
-}
diff --git a/src/commands/help.c b/src/commands/help.c
deleted file mode 100644
index 533cf3a..0000000
--- a/src/commands/help.c
+++ /dev/null
@@ -1,228 +0,0 @@
-#include <command.h>
-#include <syscalls.h>
-#include <string.h>
-#include <errno.h>
-
-// Internal prototype.
-static void help(int argc, char **argv, struct session_s *session, char *info);
-
-// Define help command into the cache section.
-CMDBLOCK("help", &help,
-"Help for Vhex version 1.0\n"
-"This chapter introduces\noperations available with vhex.\n"
-"\n"
-"I]   Keys mapping\n"
-"II]  Status bar\n"
-"III] Unused mode\n"
-"IV]  Command mode\n"
-"V]   Normal mode\n"
-"VI]  Credits\n"
-"VII] Copyright\n"
-"\n"
-"================================"
-"I] Keys mapping\n"
-"Move around: [UP], [DOWN]\n"
-"Change mode: [OPTN]\n"
-"Letter: [ALPHA] + [A ~ Z]\n"
-"Letter lock: [SHIFT] + [ALPHA]\n"
-"Letter unlock: [ALPHA]\n"
-"Number: [0 ~ 9]\n"
-"sessions: [F0 ~ F9]\n"
-"\n"
-"================================"
-"II] Status bar\n"
-"The first information (at the\nbottom left) display is the\nkeyboard status:\n"
-"   * [s] : shift mode.\n"
-"   * [l] : letter mode.\n"
-"   * [L] : caps lock.\n"
-"   * [n] : number mode.\n"
-"The second information is the\ncommand zone.\n"
-"The third information is the\ncurrent mode (unused, normal,\ncommand).\n"
-"And the last information is the session's id currently using.\n"
-"\n"
-"================================"
-"III] Unused mode\n"
-"This mode is set when the\nsession is not used.\n"
-"Basically you can't do a lot of things, but you can enter into\n"
-"the command mode using the\n[OPTN] key.\n"
-"\n"
-"================================"
-"IV] Normal mode.\n"
-"This mode allows the user to\nmove into the Virtual Memory\n"
-"using [UP] and [DOWN].\n"
-"Be careful, there is no security"
-"and some parts of the Virtual\n"
-"Memory can make your\ncalculator crash.\n"
-"If a crash occurs, don't worry, you have \"just\" read a\n"
-"non-readable space.\n"
-"Your machine will continue to\nwork perfectly after\nthe reset.\n"
-"\n"
-"================================"
-"V] Command mode\n"
-"The command mode is probably\nthe most important part\nof Vhex.\n"
-"It's the only way to move\nquickly into the different part\n"
-"of the Virtual Memory.\n"
-"To enter in command mode the\nuser can press the [OTPN] key,\n"
-"normally a \":#\" appear and\nthe user can write\ncommand.\n"
-"All commands currently\nintegrated in Vhex:\n"
-"    :systab\n"
-"    :vbrjmp <zone>\n"
-"    :syscall <id>\n"
-"    :ram <zone>\n"
-"    :rom\n"
-"    :help <command>\n"
-"We invited you to try\n\":help <cmd>\" if you don't know how a"
-" command work.\n"
-"Each command typed by the user\nis stored in a history that it\n"
-"can access using [UP] and\n[DOWN] keys.\n"
-"\n"
-"================================"
-"VI] Credits\n"
-"Special thank to:\n"
-"    - Lephenixnoir\n"
-"    - PierrotLL\n"
-"    - Simon Lothar\n"
-"    - Kristaba\n"
-"And all communities of Planet\nCasio for his help.\n"
-"specially to LephenixNoir for\nhis advices and his patience.\n"
-"\n"
-"================================"
-"VII] Copyright\n"
-"The Vhex programme use CC0\nlicence.\n"
-"It allows anyone to freely\nreuse, improve or modify my\n"
-"work for any purpose and\nwithout any legal restrictions, "
-"except those required by law.\n");
-
-/* get_nb_line() - Return the number of lines contain in the command's manual. */
-static int get_nb_line(char const *str)
-{
-	int nb_line;
-	int cursor;
-
-	if (str == NULL || *str == '\0')
-		return (-EBADMSG);
-	cursor = 0;
-	nb_line = 0;
-	do {
-		cursor += 1;
-		if (cursor >= COLUMN_OFFSET || *str == '\n'){
-			nb_line += 1;
-			cursor = 0;
-		}
-	} while (*(++str) != '\0');
-	return (nb_line + 1);
-}
-
-/* get_line() - Return the address of a target line */
-static const char *get_line(char const *str, int line)
-{
-	int cursor;
-	int nb_line;
-
-	if (line == 0)
-		return (str);
-	cursor = 0;
-	nb_line = 0;
-	do {
-		cursor += 1;
-		if (cursor >= COLUMN_OFFSET || *str == '\n'){
-			nb_line += 1;
-			cursor = 0;
-		}
-	} while (*(++str) != '\0' && nb_line < line);
-	return (str);
-}
-
-//
-// display_text() - Display only lines which should be visible.
-//
-// NOTE:
-// Due to the Casio's GetKey function, the font used is a little bit weird,
-// some characters have not the same size, so we can't calculate easily
-// the line size. (TODO: fix that).
-//
-static void display_text(char *buf, char const *str, int current_line)
-{
-	char const *text;
-	int nb_line;
-	int cursor;
-
-	text = get_line(str, current_line);
-	if (*text == '\0')
-		return;
-	nb_line = 0;
-	cursor = 0;
-	do {
-		if (*text != '\n'){
-			buf[cursor] = *text;
-			cursor += 1;
-		}
-		if (cursor >= COLUMN_OFFSET || *text == '\n'){
-			buf[cursor] = '\0';
-			print(0, nb_line * FONT_HEIGHT, buf);
-			nb_line += 1;
-			cursor = 0;
-			continue;
-		}
-	} while (*(++text) != '\0' && nb_line < LINE_OFFSET);
-	if (cursor != 0)
-		print(0, nb_line * FONT_HEIGHT, buf);
-}
-
-/* help_engine() - Display help information and handle keyboard. */
-static void help_engine(char const *text, int nb_line)
-{
-	char buf[COLUMN_OFFSET + 1];
-	unsigned int key;
-	int cursor;
-	int exit;
-
-	exit = 1;
-	cursor = 0;
-	while (exit != 0){
-		dclear();
-		// Display text.
-		display_text(buf, text, cursor);
-
-		// Display exit info.
-		dclear_area(0, SCREEN_HEIGHT - FONT_HEIGHT - 2, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1);
-		dline_horizontal(SCREEN_HEIGHT - FONT_HEIGHT - 2, 0, SCREEN_WIDTH - 1);
-		print(0, SCREEN_HEIGHT - FONT_HEIGHT, "press [EXIT]");
-		sprintf(buf, "%d/%d", cursor + 1, nb_line + 1);
-		print(SCREEN_WIDTH - (strlen(buf) * FONT_WIDTH) - 1, SCREEN_HEIGHT - FONT_HEIGHT, buf);
-		getkey(&key);
-
-		// Keys hanlding.
-		if (key == KEY_UP && cursor > 0)
-			cursor -= 1;
-		if (key == KEY_DOWN && cursor < nb_line)
-			cursor += 1;
-		if (key == KEY_EXIT)
-			exit = 0;
-	}
-}
-
-/* help() - display command manual pages. */
-static void help(int argc, char **argv, struct session_s *session, char *info)
-{
-	const struct cmd_block *command;
-	int nb_line;
-
-	(void)session;
-	command = cmd_cache_find((argc == 1) ? "help" : argv[1]);
-	if (command == NULL){
-		strcpy(info, "command error");
-		return;
-	}
-	nb_line = 0;
-	if (command->man != NULL)
-		nb_line = get_nb_line(command->man);
-	if (command->man == NULL || nb_line < 0){
-		strcpy(info, "no help entry");
-		return;
-	}
-	nb_line -= LINE_OFFSET + 1;
-	if (nb_line < 0)
-		nb_line = 0;
-	help_engine(command->man, nb_line);
-}
diff --git a/src/commands/jump_address.c b/src/commands/jump_address.c
deleted file mode 100644
index fdaf618..0000000
--- a/src/commands/jump_address.c
+++ /dev/null
@@ -1,65 +0,0 @@
-#include <command.h>
-#include <string.h>
-
-// Internal prototype.
-static void address_jump(int argc, char **argv, struct session_s *session, char *info);
-
-// Define the command block into the cache.
-CMDBLOCK("jmp", &address_jump,
-"JMP command help\n"
-"This command takes one\nparameter: the address (hexa)\n"
-"you would jump into the Virtual Memory.\n"
-"\n"
-"Be careful, there is no security"
-"and some parts of the Virtual\n"
-"Memory can make your\ncalculator crash.\n"
-"\n"
-"If a crash occurs, don't worry, you have \"just\" read a\n"
-"non-readable space.\n"
-"Your calculator will continue\nto work perfectly after\nthe reset.\n"
-"\n"
-"Virtual Memory map:\n"
-"Area P0 - 2Go - MMU enable\n"
-"0x00300000 : add-in header\n"
-"0x00300200 : add-in mapping\n"
-"0x08000000 : RAM (cache)\n"
-"Area P1 - 500Mo - MMU disable\n"
-"0x80000000 : ROM (cache)\n"
-"0x88000000 : RAM (cache)\n"
-"Area P2 - 500Mo - MMU disable\n"
-"0xa0000000 : ROM (no cache)\n"
-"0xa8000000 : RAM (no cache)\n"
-"Area P3 - 500Mo - MMU enable\n"
-"?????? CRASH ??????\n"
-"Area P4 - 500Mo - MMU disable\n"
-"0xe0000000 : Store queue area\n"
-"0xe5000000 : On chip RAM\n"
-"0xf0000000 : Instr. cache addr\n"
-"0xf1000000 : Instr. cache data\n"
-"0xf2000000 : Instr. TLB addr\n"
-"0xf3000000 : Instr. TLB data\n"
-"0xf4000000 : Operand cache addr\n"
-"0xf5000000 : Operand cache data\n"
-"0xf6000000 : TLB/PMB cache addr\n"
-"0xf7000000 : TLB/PMB cache data\n"
-"0xfc000000 : Control register\n"
-);
-
-static INLINE int check_address(char *str)
-{
-	--str;
-	while ((*(++str) >= '0' && *str <= '9') || (*str >= 'a' && *str <= 'f'));
-	return ((*str != '\0') ? 1 : 0);
-}
-
-/* address_jump() - jump into Virtual Memory. */
-static void address_jump(int argc, char **argv, struct session_s *session, char *info)
-{
-	if (argc != 2 || check_address(argv[1]) != 0){
-		strcpy(info, "arguments error");
-		return;
-	}
-	// clear the lower bits to force align the address.
-	// (one instruction takes 2 bytes, so we need to respect the alignment).
-	session->anchor = atoi_base(argv[1], 16) >> 1 << 1;
-}
diff --git a/src/commands/jump_ram.c b/src/commands/jump_ram.c
deleted file mode 100644
index 5099064..0000000
--- a/src/commands/jump_ram.c
+++ /dev/null
@@ -1,51 +0,0 @@
-#include <command.h>
-#include <string.h>
-
-// Internal prototype.
-static void ram_jump(int argc, char **argv, struct session_s *session, char *info);
-
-/* Define the command block into the cache section. */
-CMDBLOCK("ram", &ram_jump,
-"RAM command help\n"
-"This function allows user to\njump into different parts of\n"
-"the RAM mapped in the Virtual\nMemory.\n"
-"\n"
-":ram p0\n"
-"Jump into the P0 area, basically"
-"the user space who is managed\n"
-"by the Memory Management\nUnit.\n"
-"\n"
-":ram p1\n"
-"Jump into the RAM mapped in the P1 area; MMU is disabled and\n"
-"the area is cached.\n"
-"\n"
-":ram p2\n"
-"Jump into the RAM mapped in the P2 area; MMU is disable "
-"and the area is not cached.\n"
-"\n"
-":ram p4\n"
-"Jump into the internal chip\nmemory area; MMU is enabled\n"
-"and the area is cached.\n"
-);
-
-/* ram_jump() - jump into the RAM mapped in different parts of the Virtual Memory. */
-static void ram_jump(int argc, char **argv, struct session_s *session, char *info)
-{
-	if (argc != 2){
-		strcpy(info, "argument error");
-		return;
-	}
-	if (strcmp(argv[1], "p0") && strcmp(argv[1], "p1")
-	&& strcmp(argv[1], "p2") && strcmp(argv[1], "p4")){
-		sprintf(info, "bad argument");
-		return;
-	}
-	if (!strcmp(argv[1], "p0"))
-		session->anchor = 0x08100000;
-	if (!strcmp(argv[1], "p1"))
-		session->anchor = 0x88000000;
-	if (!strcmp(argv[1], "p2"))
-		session->anchor = 0xa8000000;
-	if (!strcmp(argv[1], "p4"))
-		session->anchor = 0xe5000000;
-}
diff --git a/src/commands/jump_rom.c b/src/commands/jump_rom.c
deleted file mode 100644
index d449b42..0000000
--- a/src/commands/jump_rom.c
+++ /dev/null
@@ -1,44 +0,0 @@
-#include <command.h>
-#include <string.h>
-
-// internal prototype.
-static void rom_jump(int argc, char **argv, struct session_s *session, char *info);
-
-// Define the command into the cache.
-CMDBLOCK("rom", &rom_jump,
-"ROM command help\n"
-"This command allows user to\njump into different parts of\n"
-"the ROM mapped in the Virtual\nMemory.\n"
-"\n"
-":rom addin\n"
-"Jump into the dynamic add-in\nmapping area.\n"
-"Normaly you can see the\nVhex binary :)\n"
-"(see \":help jmp\" to get the\nVirtual Memory map)\n"
-"\n"
-":rom p1\n"
-"Jump into the ROM mapped in\nthe P1 area.\n"
-"MMU is disable and the area\nis cached.\n"
-"\n"
-"rom p2\n"
-"Jump into the ROM mapped in\nthe P2 area.\n"
-"MMU is disable and the area\nis not cached.\n"
-);
-
-/* rom_jump() - jump into the ROM mapped in different parts of the Virtual Memory. */
-static void rom_jump(int argc, char **argv, struct session_s *session, char *info)
-{
-	if (argc != 2){
-		strcpy(info, "argument error");
-		return;
-	}
-	if (strcmp(argv[1], "addin") && strcmp(argv[1], "p1") && strcmp(argv[1], "p2")){
-		sprintf(info, "bad argument");
-		return;
-	}
-	if (!strcmp(argv[1], "addin"))
-		session->anchor = 0x00300200;
-	if (!strcmp(argv[1], "p1"))
-		session->anchor = 0x80000000;
-	if (!strcmp(argv[1], "p2"))
-		session->anchor = 0xa0000000;
-}
diff --git a/src/commands/jump_syscall.c b/src/commands/jump_syscall.c
deleted file mode 100644
index 14cf4b3..0000000
--- a/src/commands/jump_syscall.c
+++ /dev/null
@@ -1,120 +0,0 @@
-#include <command.h>
-#include <string.h>
-
-// Internal prototype.
-static void syscall_jump(int argc, char **argv, struct session_s *session, char *info);
-
-/* Define command block into the cache section. */
-CMDBLOCK("syscall", &syscall_jump,
-"SYSCALL command help\n"
-"Take one parameter: syscall id.\n"
-"This command will jump at the\nsyscall's code entry.\n"
-"\n"
-"Syscall list (not exhaustive):\n"
-"0x013 : GLibAddinAppExecutionCheck\n"
-"0x014 : GLibGetAddinLibInfo\n"
-"0x014 : GLibGetOSVersionInfo\n"
-"0x01c : Bdisp_WriteGraph_VRAM\n"
-"0x01d : Bdisp_WriteGraph_DD\n"
-"0x01e : Bdisp_WriteGraph_DDVRAM\n"
-"0x022 : Bdisp_ReadArea_VRAM\n"
-"0x023 : Bdisp_ReadArea_DD_OS\n"
-"0x024 : Bdisp_GetDisp_DD\n"
-"0x026 : DD_GET\n"
-"0x028 : Bdisp_PutDisp_DD\n"
-"0x030 : Bdisp_DrawLineVRAM\n"
-"0x031 : Bdisp_ClearLine_VRAM\n"
-"0x118 : Bcre_cychdr\n"
-"0x119 : Bdel_cychdr\n"
-"0x142 : Bdisp_AllClr_DD\n"
-"0x143 : Bdisp_AllClr_VRAM\n"
-"0x144 : Bdisp_AllClr_DDVRAM\n"
-"0x145 : Bdisp_GetDisp_VRAM\n"
-"0x147 : Bdisp_SetPoint_DD\n"
-"0x148 : Bdisp_SetPoint_DDVRAM\n"
-"0x149 : Bdisp_GetPoint_VRAM\n"
-"0x14a : Bdisp_AreaClr_DD\n"
-"0x14b : Bdisp_AreaClr_VRAM\n"
-"0x14c : Bdisp_AreaClr_DDVRAM\n"
-"0x14d : Bdisp_AreaReverseVRAM\n"
-"0x11a : Bsta_cychdr\n"
-"0x11b : Bstp_cychdr\n"
-"0x11f : Bdisp_PutDispArea_DD\n"
-"0x1e7 : BfileFLS_CloseFile\n"
-"0x218 : flsFindCLose\n"
-"0x242 : Bkey_Set_RepeatTime\n"
-"0x243 : Bkey_Get_RepeatTime\n"
-"0x244 : Bkey_Set_RepeatTime_Default\n"
-"0x247 : Bkey_GetKeyWait\n"
-"0x24c : Chattering\n"
-"0x374 : BMCSRenameVariable\n"
-"0x3ed : SetFlagPaturn\n"
-"0x3fa : Hmem_SetMMU\n"
-"0x420 : BSrl_DummyWAIT\n"
-"0x42c : Bfile_OpenFile_OS\n"
-"0x42d : Bfile_CloseFile_OS\n"
-"0x42e : Bfile_GetMediaFree_OS\n"
-"0x42f : Bfile_GetFileSize_OS\n"
-"0x431 : Bfile_SeekFile_OS\n"
-"0x432 : Bfile_ReadFile_OS\n"
-"0x434 : Bfile_CreateEntry\n"
-"0x435 : Bfile_WriteFile_OS\n"
-"0x439 : Bfile_DeleteEntry\n"
-"0x43b : Bfile_FindFirst\n"
-"0x43d : Bfile_FindClose\n"
-"0x43c : Bfile_FindNext\n"
-"0x462 : GetAppName\n"
-"0x494 : CallBackAtQuitMainFunction\n"
-"0x807 : Locate_OS\n"
-"0x82b : MCSPutVar2\n"
-"0x830 : MCSOvwDat2\n"
-"0x836 : MCSDelVar2\n"
-"0x840 : MCSGetDlen2\n"
-"0x841 : MCSGetData1\n"
-"0x844 : MCSGetCapa\n"
-"0x8fe : PopUpWin\n"
-"0x808 : Print\n"
-"0x809 : PrintRev\n"
-"0x80b : PrintRev\n"
-"0x80d : PrintRLine\n"
-"0x80a : PrintC\n"
-"0x80c : PrintLine\n"
-"0x813 : SaveDisp\n"
-"0x814 : RestoreDisp\n"
-"0x90f : GetKey\n"
-"0x9ad : PrintXY\n"
-"0xacc : free\n"
-"0xacd : malloc\n"
-"0xc4f : PrintMiniSd\n"
-"0xe6b : calloc\n"
-"0xe6d : realloc\n"
-"0x1032 : Bkey_GetKeyTableInfo\nJumpFunc\n"
-);
-
-static INLINE int check_address(char *str)
-{
-	--str;
-	while ((*(++str) >= '0' && *str <= '9') || (*str >= 'a' && *str <= 'f'));
-	return ((*str != '\0') ? 1 : 0);
-}
-
-//
-// syscall_jump()
-// Casio doesn't use the TRAPA instruction (software interruption), for switch from
-// user mode to privileged mode. They just jump always at 0x80010070 and use the
-// table of syscall addresses to redirect the jump. (and the table address is always
-// stored at 0x8001007c).
-//
-static void syscall_jump(int argc, char **argv, struct session_s *session, char *info)
-{
-	uint32_t *systab;
-	uint32_t id;
-
-	if (argc != 2 || check_address(argv[1]) != 0){
-		strcpy(info, "arguments error");
-		return;
-	}
-	id = atoi_base(argv[1], 16);
-	systab = (void*)(*(uint32_t *)0x8001007c);
-	session->anchor = systab[id];
-}
diff --git a/src/commands/jump_systab.c b/src/commands/jump_systab.c
deleted file mode 100644
index f2c236f..0000000
--- a/src/commands/jump_systab.c
+++ /dev/null
@@ -1,29 +0,0 @@
-#include <command.h>
-#include <string.h>
-
-// Internal prototype.
-static void systab_jump(int argc, char **argv, struct session_s *session, char *info);
-
-// Define the command block into the cache
-CMDBLOCK("systab", &systab_jump,
-"SYSTAB command help\n"
-"This function allows user to\njump into the Casio \"syscall\n"
-"handler\".\n"
-"\n"
-"Curiously, Casio doesn't use the"
-"TRAPA instruction for handle\n"
-"syscall, but jump at\n0x80010070.\n"
-"This don't explain why we are\nalways in privileged mode, but\n"
-"now we can affirm that Casio\ndo it intentionally.\n"
-);
-
-/* systab_jump() - Jump into the Casio "syscall handler". */
-static void systab_jump(int argc, char **argv, struct session_s *session, char *info)
-{
-	if (argc != 1){
-		strcpy(info, "argument error");
-		return;
-	}
-	(void)argv;
-	session->anchor = 0x80010070;
-}
diff --git a/src/commands/jump_vbr.c b/src/commands/jump_vbr.c
deleted file mode 100644
index 461c5c8..0000000
--- a/src/commands/jump_vbr.c
+++ /dev/null
@@ -1,49 +0,0 @@
-#include <command.h>
-#include <string.h>
-
-// Internal prototype
-static void vbrjmp(int argc, char **argv, struct session_s *session, char *info);
-
-// TODO: write doc.
-CMDBLOCK("vbrjmp", &vbrjmp,
-"VBR JUMP command help\n"
-"This command jump into Casio's\nhandlers.\n"
-"\n"
-"Due to the SH3 / SH4 VBR system\n, there are 3 vectors offset\n"
-"called by the processor:\n"
-"    * exception (VBR + 0x100)\n"
-"    * tlb miss  (VBR + 0x400)\n"
-"    * interrupt (VBR + 0x600)\n"
-"\n"
-"You can access to each handler\nusing this command list:\n"
-":vbrjmp except  VBR + 0x100\n"
-":vbrjmp fault   VBR + 0x400\n"
-":vbrjmp int     VBR + 0x600\n"
-);
-
-//
-// vbr_jump() - jump to the exception, tlb or interrupt, Casio handler.
-// Due to the SH3 / SH4 VBR system, there are 3 vectors offset called
-// by the processor:
-// 	* vbr + 0x100 -> general exeptions.
-// 	* vbr + 0x400 -> tlb miss.
-//	* vbr + 0x600 -> interrupts.
-//
-static void vbrjmp(int argc, char **argv, struct session_s *session, char *info)
-{
-	if (argc != 2){
-		strcpy(info, "arguments error");
-		return;
-	}
-	if (strcmp(argv[1], "fault") && strcmp(argv[1], "except") && strcmp(argv[1], "int")){
-		sprintf(info, "bad argument");
-		return;
-	}
-	__asm__ volatile ("stc vbr, %0" : "=r"(session->anchor));
-	if (!strcmp(argv[1], "except"))
-		session->anchor += 0x100;
-	if (!strcmp(argv[1], "fault"))
-		session->anchor += 0x400;
-	if (!strcmp(argv[1], "int"))
-		session->anchor += 0x600;
-}
diff --git a/src/commands/quit.c b/src/commands/quit.c
deleted file mode 100644
index 9a3832e..0000000
--- a/src/commands/quit.c
+++ /dev/null
@@ -1,18 +0,0 @@
-#include <command.h>
-#include <string.h>
-
-// internal prototype.
-static void quit(int argc, char **argv, struct session_s *session, char *info);
-
-// Define the command into the cache.
-CMDBLOCK("quit", &quit, NULL);
-
-/* quit() - switch to UNUSED mode */
-static void quit(int argc, char **argv, struct session_s *session, char *info)
-{
-	(void)argc;
-	(void)argv;
-	strcpy(info, "exit");
-	session->mode = UNUSED;
-	session->anchor = 0x00000000;
-}
diff --git a/src/commands/where.c b/src/commands/where.c
deleted file mode 100644
index 8228d1f..0000000
--- a/src/commands/where.c
+++ /dev/null
@@ -1,16 +0,0 @@
-#include <command.h>
-#include <string.h>
-
-// internal prototype.
-static void where(int argc, char **argv, struct session_s *session, char *info);
-
-// Define the command into the cache.
-CMDBLOCK("where", &where, NULL);
-
-/* where() - display the user positision in the Virtual Memory. */
-static void where(int argc, char **argv, struct session_s *session, char *info)
-{
-	(void)argc;
-	(void)argv;
-	sprintf(info, "%#x", session->anchor + (session->cursor << 1));
-}
diff --git a/src/display/intructions.c b/src/display/intructions.c
deleted file mode 100644
index 6c5aacc..0000000
--- a/src/display/intructions.c
+++ /dev/null
@@ -1,72 +0,0 @@
-#include <utils.h>
-#include <syscalls.h>
-#include <opcode.h>
-#include <string.h>
-
-//TODO: move me ?
-static INLINE int get_shift(uint16_t mask)
-{
-	int i;
-
-	if (mask == 0x0000)
-		return (0);
-	i = -1;
-	while (++i < 16 && !(mask & (0x01 << i)));
-	return (i);
-}
-
-/* get_instructions() - find mnemonic and instruction argument(s) */
-static void get_instructions(char *str, uint16_t bytes_code)
-{
-	int shift[ARGUMENTS_MAX];
-	size_t i;
-	size_t j;
-
-	i = -1;
-	while (opcode[++i].name != NULL
-	&& (bytes_code & opcode[i].mask) != opcode[i].code);
-	if (opcode[i].name == NULL){
-		strcpy(str, "????");
-		return;
-	}
-	j = -1;
-	while (++j < ARGUMENTS_MAX)
-		shift[j] = get_shift(opcode[i].arg_mask[j]);
-	//TODO: update this.
-	sprintf(str, opcode[i].name,
-	(bytes_code & opcode[i].arg_mask[0]) >> shift[0],
-	(bytes_code & opcode[i].arg_mask[1]) >> shift[1],
-	(bytes_code & opcode[i].arg_mask[2]) >> shift[2]);
-}
-
-//
-// display_instructions()
-// Translate "on-the-fly" each binary instructions stored at
-// the anchor location.
-// Almost instructions can be translated; only FPU instructions
-// is not handled because it's not available on the SH3 based MPU.
-//
-void display_instructions(const struct session_s *session)
-{
-	char mnemonic[128];
-	uint16_t *area;
-	char buf[64];
-	size_t y;
-
-	if (session->mode == COMMAND){
-		restore_window(1);
-		return;
-	}
-	if (session->mode == UNUSED || session->anchor == 0x00000000){
-		print((SCREEN_WIDTH >> 1) - ((sizeof("Empty session") * FONT_WIDTH) >> 1),
-		(SCREEN_HEIGHT >> 1) - (FONT_HEIGHT >> 1), "Empty session");
-		return;
-	}
-	y = -1;
-	area = (void*)(session->anchor + (session->cursor << 1));
-	while (++y < LINE_OFFSET){
-		get_instructions(mnemonic, area[y]);
-		sprintf(buf, "%4x %4x %s", &(area[y]), area[y], mnemonic);
-		print(0, y * FONT_HEIGHT, buf);
-	}
-}
diff --git a/src/display/metainfos.c b/src/display/metainfos.c
deleted file mode 100644
index 4cc000f..0000000
--- a/src/display/metainfos.c
+++ /dev/null
@@ -1,27 +0,0 @@
-#include <utils.h>
-#include <syscalls.h>
-#include <string.h>
-
-/* display_metainfo() - display the "status" bar and display user's information */
-void display_metainfos(const struct vhex_s *vhex, const struct session_s *session)
-{
-	static const char *mode_name[] = {"unused", "command", "normal", "free"};
-	static const char insert_name[] = {'l', 'L', 'n', 's'};
-	const void *tmp;
-	char buf[32];
-
-	// clear area
-	dclear_area(0, SCREEN_HEIGHT - FONT_HEIGHT - 2, SCREEN_WIDTH - 1, SCREEN_HEIGHT - 1);
-	dline_horizontal(SCREEN_HEIGHT - FONT_HEIGHT - 2, 0, SCREEN_WIDTH - 1);
-
-	// Display informations
-	sprintf(buf, "[%s][%d]", mode_name[session->mode], vhex->current_session);
-	print(SCREEN_WIDTH - (strlen(buf) * FONT_WIDTH) - 1, SCREEN_HEIGHT - FONT_HEIGHT, buf);
-	if (session->mode == COMMAND)
-		sprintf(buf, "[%c]:%s#", insert_name[vhex->insert.mode], vhex->insert.cmd);
-	else {
-		tmp = (*vhex->info == '\0') ? vhex->insert.cmd : vhex->info;
-		sprintf(buf, "[%c] %s", insert_name[vhex->insert.mode], tmp);
-	}
-	print(0, SCREEN_HEIGHT - FONT_HEIGHT, buf);
-}
diff --git a/src/history.c b/src/history.c
deleted file mode 100644
index b549b63..0000000
--- a/src/history.c
+++ /dev/null
@@ -1,64 +0,0 @@
-#ifndef DEBUG
-# include <history.h>
-# include <syscalls.h>
-#else
-# include "history.h"
-# include <stdlib.h>
-#endif
-#include <string.h>
-#include <errno.h>
-
-//---
-// history_update()
-// Add new history node to the chained list. This is a singly
-// linked list, but the node insertion from the beginning.
-//
-// Exemple: add node A, B, C and D
-// 1. A -> NULL
-// 2. B -> A -> NULL
-// 3. C -> B -> A -> NULL
-// 4. D -> C -> B -> A -> NULL
-//---
-int history_update(struct node **list, const char *data)
-{
-	void *swap;
-
-	if (list == NULL)
-		return (EFAULT);
-	swap = *list;
-	*list = (struct node *)malloc(sizeof(struct node));
-	if (*list == NULL){
-		*list = swap;
-		return (ENOMEM);
-	}
-	strcpy((void*)(*list)->data, data);
-	(*list)->next = swap;
-	return (0);
-}
-
-//
-// history_get()
-// primitive function which will return the data stored in
-// the "offset" position in the list.
-//
-const void *history_get(struct node *list, off_t offset)
-{
-	if (list == NULL)
-		return (NULL);
-	if (offset == 0)
-		return (list->data);
-	return (history_get(list->next, offset - 1));
-}
-
-//
-// history_quit()
-// Free all allocated memory.
-//
-void history_quit(struct node **list)
-{
-	if (list == NULL || *list == NULL)
-		return;
-	history_quit(&(*list)->next);
-	free(*list);
-	*list = NULL;
-}
diff --git a/src/kernel/bootstrap/fx9860_context.c b/src/kernel/bootstrap/fx9860_context.c
new file mode 100644
index 0000000..3487746
--- /dev/null
+++ b/src/kernel/bootstrap/fx9860_context.c
@@ -0,0 +1,59 @@
+#include <kernel/context.h>
+#include <kernel/hardware/keysc.h>
+#include <kernel/hardware/intc.h>
+
+void fx9860_context_save(fx9860_context_t *context)
+{
+	// Save Interrupt Controller (INTC)
+	context->intc.ipra = SH7305_INTC.IPRA.WORD;
+	context->intc.iprb = SH7305_INTC.IPRB.WORD;
+	context->intc.iprc = SH7305_INTC.IPRC.WORD;
+	context->intc.iprd = SH7305_INTC.IPRD.WORD;
+	context->intc.ipre = SH7305_INTC.IPRE.WORD;
+	context->intc.iprf = SH7305_INTC.IPRF.WORD;
+	context->intc.iprg = SH7305_INTC.IPRG.WORD;
+	context->intc.iprh = SH7305_INTC.IPRH.WORD;
+	context->intc.ipri = SH7305_INTC.IPRI.WORD;
+	context->intc.iprj = SH7305_INTC.IPRJ.WORD;
+	context->intc.iprk = SH7305_INTC.IPRK.WORD;
+	context->intc.iprl = SH7305_INTC.IPRL.WORD;
+
+	// Save Key Scan (KEYSC) context.
+	context->keyboard.control = SH7305_KEYSC.CONTROL.WORD;
+	context->keyboard.autofix = SH7305_KEYSC.AUTOFIX.WORD;
+	context->keyboard.scan_mode = SH7305_KEYSC.SCAN_MODE.WORD;
+	context->keyboard.scan_state = SH7305_KEYSC.SCAN_STATE.WORD;
+	context->keyboard.interrupt = SH7305_KEYSC.INTERRUPT.WORD;
+	context->keyboard.scan_wait = SH7305_KEYSC.SCAN_WAIT.WORD;
+	context->keyboard.scan_interval = SH7305_KEYSC.SCAN_INTERVAL;
+	context->keyboard.kyoutdr = SH7305_KEYSC.KYOUTDR.WORD;
+	context->keyboard.kyindr = SH7305_KEYSC.KYINDR.WORD;
+}
+
+void fx9860_context_restore(fx9860_context_t *context)
+{
+	// Restore Key Scan (KEYSC) context.
+	SH7305_KEYSC.CONTROL.WORD = context->keyboard.control;
+	SH7305_KEYSC.AUTOFIX.WORD = context->keyboard.autofix;
+	SH7305_KEYSC.SCAN_MODE.WORD = context->keyboard.scan_mode;
+	SH7305_KEYSC.SCAN_STATE.WORD = context->keyboard.scan_state;
+	SH7305_KEYSC.INTERRUPT.WORD = context->keyboard.interrupt;
+	SH7305_KEYSC.SCAN_WAIT.WORD = context->keyboard.scan_wait;
+	SH7305_KEYSC.SCAN_INTERVAL = context->keyboard.scan_interval;
+	SH7305_KEYSC.KYOUTDR.WORD = context->keyboard.kyoutdr;
+	SH7305_KEYSC.KYINDR.WORD = context->keyboard.kyindr;
+
+	// Restore Interrupt Controller (INTC)
+	SH7305_INTC.IPRA.WORD = context->intc.ipra;
+	SH7305_INTC.IPRB.WORD = context->intc.iprb;
+	SH7305_INTC.IPRC.WORD = context->intc.iprc;
+	SH7305_INTC.IPRD.WORD = context->intc.iprd;
+	SH7305_INTC.IPRE.WORD = context->intc.ipre;
+	SH7305_INTC.IPRF.WORD = context->intc.iprf;
+	SH7305_INTC.IPRG.WORD = context->intc.iprg;
+	SH7305_INTC.IPRH.WORD = context->intc.iprh;
+	SH7305_INTC.IPRI.WORD = context->intc.ipri;
+	SH7305_INTC.IPRJ.WORD = context->intc.iprj;
+	SH7305_INTC.IPRK.WORD = context->intc.iprk;
+	SH7305_INTC.IPRL.WORD = context->intc.iprl;
+}
diff --git a/src/kernel/bootstrap/mpu.c b/src/kernel/bootstrap/mpu.c
new file mode 100644
index 0000000..6804b71
--- /dev/null
+++ b/src/kernel/bootstrap/mpu.c
@@ -0,0 +1,64 @@
+#include <kernel/types.h>
+
+/* check_sh3 - Detecting sh3-based MPU */
+static mpu_t check_sh3(uint16_t tplcr)
+{
+	if (tplcr == 0x0fff)
+		return (MPU_SH7337);
+	if (tplcr == 0x00ff)
+		return (MPU_SH7355);
+	return (MPU_UNKNOWN);
+}
+
+/* check_sh3 - Detecting sh4-based MPU */
+static mpu_t check_sh4(void)
+{
+	volatile uint32_t *pvr	= (void *)0xff000030;
+	volatile uint32_t *prr	= (void *)0xff000044;
+	uint32_t product;
+
+	if ((*pvr & 0xffffff00) != 0x10300b00)
+		return (MPU_UNKNOWN);
+	product = *prr & 0xfffffff0;
+	if (product == 0x00002c00)
+		return (MPU_SH7305);
+	if (product == 0x00002200)
+		return (MPU_SH7724);
+	return (MPU_UNKNOWN);
+}
+
+//
+// get_mpu()
+//
+// Return the MPU identifier of the calculator.
+// Thanks to SimonLothar and Lephenixnoir for this function
+// and related information.
+//
+// Processor version register (PVR) and product control register (PRR)
+// hold information about the MPU version, they but are only accessible on
+// SH-4-based MPUs.
+// To detect SH-3-based MPUs, this function uses port L control register
+// (PLCR), whose bits 8 to 15 cannot be set with SH7337 where bits 8 to 11
+// can be set with SH7355.
+//
+// Additionally, the CPU core ID register (CPIDR) at 0xff000048 returns 1
+// on SH7305.
+//
+mpu_t mpu_get(void)
+{
+	volatile uint16_t *plcr	= (void *)0xa4000114;
+	uint16_t splcr;
+	uint16_t tplcr;
+	mpu_t mpu;
+
+	// Check port L control register.
+	splcr = *plcr;
+	*plcr = 0xffff;
+	tplcr = *plcr;
+	*plcr = splcr;
+
+	mpu = check_sh3(tplcr);
+	if (mpu != MPU_UNKNOWN)
+		return (mpu);
+	return (check_sh4());
+}
diff --git a/src/kernel/bootstrap/section_actions.s b/src/kernel/bootstrap/section_actions.s
new file mode 100644
index 0000000..776bd7f
--- /dev/null
+++ b/src/kernel/bootstrap/section_actions.s
@@ -0,0 +1,49 @@
+.globl	_section_wipe
+.global	_section_load
+.type	_section_load, @function
+.type	_section_wipe, @function
+
+.align 2
+/*
+** section_map(uint32_t *dest, uint32_t *src, size_t size)
+** Load section using his symbols.
+*/
+_section_load:
+	shlr2	r6		! sections are force 4-aligned by the linker. 
+	tst	r6, r6		! check null section...
+	bt	load_loop_end	! ...if null, exit.
+
+load_loop_entry:
+	mov.l	@r5, r1		! get "src" data.
+	mov.l	r1, @r4		! copy into the "dest" section.
+	add	#4, r5		! update "src" address.
+	dt	r6		! check the load size.
+	bf/s	load_loop_entry	! loop jump.
+	add	#4, r4		! update "dest" address.
+
+load_loop_end:
+	rts			! clean exit.
+	nop			! delayed branch.
+	
+
+/*
+** section_wipe(uint32_t *bsection, size_t size)
+** Wipe section using his symbols.
+*/
+_section_wipe:
+	mov	#0, r0		! wipe data.
+	shlr2	r5		! the section force 4-aligned by the linker.
+	tst	r5, r5		! Check null section...
+	bt	wipe_loop_end	! ...if null, exit !
+
+wipe_loop_entry:
+	mov.l	r0, @r4		! wipe section part.
+	dt	r5		! check the section size.
+	bf/s	wipe_loop_entry	! loop jump.
+	add	#4, r4		! address update.
+
+wipe_loop_end:
+	rts			! clean exit.
+	nop			! delayed branch.
+	
+.end
diff --git a/src/kernel/bootstrap/start.c b/src/kernel/bootstrap/start.c
new file mode 100644
index 0000000..012bb09
--- /dev/null
+++ b/src/kernel/bootstrap/start.c
@@ -0,0 +1,151 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <kernel/context.h>
+#include <kernel/atomic.h>
+#include <kernel/types.h>
+#include <lib/display.h>
+#include <lib/string.h>
+
+// Internal symbols
+//uint32_t gcc_fix[256];
+//uint32_t *VRAM = gcc_fix;
+mpu_t current_mpu = MPU_UNKNOWN;
+const char *casio_os_version = (void*)0xa0010020;
+fx9860_context_t casio_context;
+uint32_t casio_vbr;
+
+// Symbols defined by the linker
+extern uint32_t bbss;
+extern uint32_t sbss;
+extern uint32_t bdata_ram;
+extern uint32_t bdata_rom;
+extern uint32_t sdata;
+extern uint32_t bvhex_ram;
+extern uint32_t bvhex_rom;
+extern uint32_t svhex;
+extern uint32_t vhex_vbr;
+
+// Internal functions.
+extern void section_wipe(uint32_t *section, size_t size);
+extern void section_load(uint32_t *dest, uint32_t *src, size_t size);
+extern uint32_t vbr_set(uint32_t new_vbr);
+extern uint32_t vbr_get(void);
+extern mpu_t mpu_get(void);
+extern int main(void);
+extern void vhex_context_set(void);
+
+
+__attribute__((section(".pretext")))
+int start(void)
+{
+	int error;
+
+	// Wipe .bss section and dump .data / Vhex sections
+	section_wipe(&bbss, (size_t)&sbss);
+	section_load(&bdata_ram, &bdata_rom, (size_t)&sdata);
+	section_load(&bvhex_ram, &bvhex_rom, (size_t)&svhex);
+
+	// Check MPU hardware.
+	current_mpu = mpu_get();
+	if (current_mpu != MPU_SH7305)
+	{
+		return (0);
+	}
+
+	// Mask interrupt, change context and switch VBR.
+	atomic_start();
+	fx9860_context_save(&casio_context);
+	casio_vbr = vbr_set((uint32_t)&vhex_vbr);
+	vhex_context_set();
+	atomic_end();
+
+// VBR test.
+	__asm__ volatile ("trapa #0");
+
+	// Call high level abstraction.
+	error = main();
+
+	// Mask interrupt, change context and switch VBR.
+	atomic_start();
+	fx9860_context_restore(&casio_context);
+	vbr_set(casio_vbr);
+	atomic_end();
+
+	// Return the abstraction error.
+	return (error);
+}
+
+//
+// initialize() - kernel entry
+// This is the "real" entry of the kernel (after stack and CPU configuration).
+// This part *SHOULD* be exception safe because the CPU block all exception and interruption,
+// so if an exception occur during the "bootstrap" part, the processor will "crash".
+//
+/*void initialize(void)
+{
+	interrupt_block();
+	printk(KERN_NOTICE, "Kernel initialization...\n");
+
+	// Wipe BSS section !
+	printk(KERN_NOTICE, "Wipe bss / dump data...\n");
+	memcpy(&bdata_ram, &bdata_rom, (size_t)&sdata);
+	memset(&bbss, 0x00, (size_t)&sbss);
+
+
+	// Check MPU.
+	current_mpu = mpu_get();
+	if (current_mpu != MPU_SH7305)
+	{
+		printk(KERN_NOTICE, "ARCH ERROR !\n");
+		int i = -1;
+		while (++i < 500000);
+		return (0);
+	}
+
+	// Dump kernel and data.
+	printk(KERN_NOTICE, "Dump VBR space...\n");
+	memcpy(&bvhex_ram, &bvhex_rom, (size_t)&svhex);
+
+	// Initialize Interruption (extern module, VBR, handlers)
+	printk(KERN_NOTICE, "Initialize hardware context...\n");
+	sh7305_context_initialize();
+
+	// Save / set new VBR.
+	printk(KERN_NOTICE, "Switch VBR / SR register...\n");
+	__asm__ volatile (
+			"stc    vbr, %0;"
+			"stc    sr, %1;"
+			"ldc    %2, vbr;"
+			"ldc    %3, sr"
+			: "=r"(casio_vbr), "=r"(casio_sr)
+			: "r"(&vhex_vbr), "r"(0x60000000)
+			:
+			);
+
+	printk(KERN_NOTICE, "Initialize heap space...\n");
+	pm_heap_initialize((void*)0x8806000, (void*)0x8808000, 32);
+
+	// Kernel initialized !
+	printk(KERN_NOTICE, "Kernel initialized !\n");
+	interrupt_unblock();
+
+	// Call shell.
+	shell_entry();
+
+	// Kernel exit part.
+	printk(KERN_NOTICE, "Kernel exit !");
+	interrupt_block();
+
+	// restore Casio's context.
+	printk(KERN_NOTICE, "Restore hardware context...\n");
+	sh7305_context_restore();
+
+	// Restore VBR / CPU configurations.
+	printk(KERN_NOTICE, "Restore VBR / SR...\n");
+	__asm__ volatile ("ldc %0, vbr" : : "r"(&casio_vbr) : );
+	__asm__ volatile ("ldc %0, sr"  : : "r"(casio_sr) : );
+
+	// Clean exit.
+	interrupt_unblock();
+	return (0);
+}*/
diff --git a/src/kernel/bootstrap/vbr.s b/src/kernel/bootstrap/vbr.s
new file mode 100644
index 0000000..93e6c73
--- /dev/null
+++ b/src/kernel/bootstrap/vbr.s
@@ -0,0 +1,35 @@
+.global	_vbr_get
+.global	_vbr_set
+
+.type	_vbr_set, @function
+.type	_vbr_get, @function
+
+.text
+.align 2
+_vbr_get:
+	stc	vbr, r0		! Get VBR register.
+	rts			! Exit
+	nop			! (db) nop
+
+_vbr_set:
+	! Block interrupt	
+	stc	sr, r1		! Get SR register.
+	mov	r1, r3		! Save current SR data.
+	mov.l	.bl_mask, r2	! Get SR.BL mask.
+	or	r2, r1		! Set SR.BL to 1.
+	ldc	r1, sr		! Update SR register.
+
+	! Get / Changle VBR
+	stc	vbr, r0		! Get VBR register.
+	ldc	r4, vbr		! Update VBR register.
+
+	! Unblock interrupt.
+	ldc	r3, sr		! Restore SR register.
+
+	! Exit
+	rts			! Exit
+	nop			! (db) nop
+
+.align 4
+.bl_mask:	.long 0x100000f0
+.end
diff --git a/src/kernel/bootstrap/vhex_context.c b/src/kernel/bootstrap/vhex_context.c
new file mode 100644
index 0000000..0b6c18b
--- /dev/null
+++ b/src/kernel/bootstrap/vhex_context.c
@@ -0,0 +1,52 @@
+#include <stdint.h>
+#include <stddef.h>
+#include <kernel/hardware/keysc.h>
+#include <kernel/hardware/intc.h>
+
+void vhex_context_set(void)
+{
+	// Initialize Interrupt Controller (INTC).
+	SH7305_INTC.IPRA.WORD = 0x0000;
+	SH7305_INTC.IPRB.WORD = 0x0000;
+	SH7305_INTC.IPRC.WORD = 0x0000;
+	SH7305_INTC.IPRD.WORD = 0x0000;
+	SH7305_INTC.IPRE.WORD = 0x0000;
+	SH7305_INTC.IPRF.WORD = 0x0000;
+	SH7305_INTC.IPRG.WORD = 0x0000;
+	SH7305_INTC.IPRH.WORD = 0x0000;
+	SH7305_INTC.IPRI.WORD = 0x0000;
+	SH7305_INTC.IPRJ.WORD = 0x0000;
+	SH7305_INTC.IPRK.WORD = 0x0000;
+	SH7305_INTC.IPRL.WORD = 0x0000;
+
+	// Configure Key Scan (KEYSC)
+/*	SH7305_INTC.IMR5.KEYI = 1;			// Mask KEYSC interrupt.
+	SH7305_INTC.IPRF.KEYSC = 15;			// Disable KEYSC interrupt.
+	SH7305_KEYSC.CONTROL.KEYIE = 0;			// Disable KEYSC interrupt during init.
+	SH7305_KEYSC.CONTROL.INTMODE = 0b00;		// Use default (?) interrupt mode.
+	SH7305_KEYSC.AUTOFIX.ENABLE = 1;		// Enable key bounce fix (?)
+	SH7305_KEYSC.AUTOFIX.UNKNOWN0 = 0b100;		// Unknown, use Casio's value. (autofix)
+	SH7305_KEYSC.AUTOFIX.UNKNOWN1 = 0b10;		// Unknown, use Casio's value. (autofix)
+	SH7305_KEYSC.SCAN_MODE.UNKNOWN0 = 0b000;	// Unknown, use Casio's value. (scan mode)
+	SH7305_KEYSC.SCAN_MODE.UNKNOWN1 = 0b010;	// Unknown, use Casio's value. (scan mode)
+	SH7305_KEYSC.INTERRUPT.KYCPU_IE = 0b0000100;	// Interrupt when one key is pressed or released.
+	SH7305_KEYSC.SCAN_WAIT.TIME = 0x00;		// No time between each interrupt.
+	SH7305_KEYSC.SCAN_INTERVAL = 0x98;		// Unknown, use Casio's value. (scan interval)
+	SH7305_KEYSC.KYOUTDR.KYO5DT = 0b11;		// Trigger when high-impedance state is detected.
+	SH7305_KEYSC.KYOUTDR.KYO4DT = 0b11;		// Trigger when high-impedance state is detected.
+	SH7305_KEYSC.KYOUTDR.KYO3DT = 0b11;		// Trigger when high-impedance state is detected.
+	SH7305_KEYSC.KYOUTDR.KYO2DT = 0b11;		// Trigger when high-impedance state is detected.
+	SH7305_KEYSC.KYOUTDR.KYO1DT = 0b11;		// Trigger when high-impedance state is detected.
+	SH7305_KEYSC.KYOUTDR.KYO0DT = 0b11;		// Trigger when high-impedance state is detected.
+	SH7305_KEYSC.KYINDR.KYDIR6 = 1;			// Scan [F1],[SHIFT],[ALPHA],[x,o,T],[div],[7],[4],[1],[0]
+	SH7305_KEYSC.KYINDR.KYDIR5 = 1;			// Scan [F2],[OPT],[^2],[log],[FD],[8],[5],[2],[.]
+	SH7305_KEYSC.KYINDR.KYDIR4 = 1;			// Scan [F3],[VAR],[^],[ln],[(],[9],[6],[3],[x10]
+	SH7305_KEYSC.KYINDR.KYDIR3 = 1;			// Scan [F4],[MENU],[EXIT],[sin],[)],[DEL],[x],[+],[(-)]
+	SH7305_KEYSC.KYINDR.KYDIR2 = 1;			// Scan [F5],[left],[down],[cos],[,],[%],[-],[EXE]
+	SH7305_KEYSC.KYINDR.KYDIR1 = 1;			// Scan [F6],[up],[right],[tan],[->]
+	SH7305_KEYSC.KYINDR.KYDIR0 = 1;			// Scan [AC/ON]
+	SH7305_KEYSC.CONTROL.KEYIE = 1;			// Enable KEYSC interrupt.
+	SH7305_INTC.IPRF.KEYSC = 15;			// Set KEYSC interrupt priority (max).
+	SH7305_INTC.IMCR5.KEYI = 1;			// Clear KEYSC interrupt mask.
+*/
+}
diff --git a/src/kernel/hardware/t6k11/display.s b/src/kernel/hardware/t6k11/display.s
new file mode 100644
index 0000000..d47a28b
--- /dev/null
+++ b/src/kernel/hardware/t6k11/display.s
@@ -0,0 +1,55 @@
+.global _t6k11_display
+.type	_t6k11_display, @function
+
+.text
+.align 2
+/*
+	_t6k11_display(void *vram)
+	This function will display the vram on the screen.
+	This is the T6K11 drivers, DO NOT USE this function if you are
+	not absolutly sure that what you are doing.
+
+	TODO: use DMA ?
+*/
+# register organisation:
+#	r0	Y axis loop.
+#	r1	LCD register selector. 
+#	r2	LCD data register.
+#	r3	X axis loop.
+#	r4	VRAM address.
+_t6k11_display:
+	mov.l r8, @-r15
+	mov.l r9, @-r15
+	mov.l 1f, r1
+	mov.l 2f, r2
+	mov #4, r6
+	mov #0, r7
+	mov #7, r8
+	mov #192, r5
+	mov #64, r0
+	loop_y:
+
+		mov.b r6, @r1
+		mov.b r5, @r2
+		mov.b r6, @r1
+		mov.b r7, @r2
+		mov.b r8, @r1
+		mov #16, r3
+		loop_x:
+
+			mov.b @r4+, r9
+			mov.b r9, @r2
+
+		dt r3
+		bf loop_x
+
+	dt r0
+	bf.s loop_y
+	add #1, r5
+	mov.l @r15+, r9
+	rts
+	mov.l @r15+, r8
+
+.align 4
+1:	.long 0xb4000000	/* LCD register selector */
+2:	.long 0xb4010000	/* LCD data register */
diff --git a/src/kernel/tty/close.c b/src/kernel/tty/close.c
new file mode 100644
index 0000000..bd0bacf
--- /dev/null
+++ b/src/kernel/tty/close.c
@@ -0,0 +1,7 @@
+#include <kernel/tty.h>
+
+int tty_close(void)
+{
+	// Do nothing for now.
+	return (0);
+}
diff --git a/src/kernel/tty/open.c b/src/kernel/tty/open.c
new file mode 100644
index 0000000..42cd727
--- /dev/null
+++ b/src/kernel/tty/open.c
@@ -0,0 +1,18 @@
+#include <kernel/tty.h>
+#include <lib/display.h>
+
+// Internal TTY object.
+struct tty_s tty;
+
+int tty_open(void)
+{
+	// Initialize TTY.
+	tty.cursor.x = 0;
+	tty.cursor.y = 0;
+	tty.cursor.max.x = DISPLAY_SCREEN_WIDTH / (KERNEL_FONT_REAL_WIDTH + 1);
+	tty.cursor.max.y = DISPLAY_SCREEN_HEIGHT / (KERNEL_FONT_REAL_HEIGHT + 1);
+
+	// Clear VRAM.
+	dclear();
+	return (0);
+}
diff --git a/src/kernel/tty/write.c b/src/kernel/tty/write.c
new file mode 100644
index 0000000..51fb577
--- /dev/null
+++ b/src/kernel/tty/write.c
@@ -0,0 +1,49 @@
+#include <kernel/tty.h>
+#include <lib/display.h>
+
+// Internal TTY object.
+extern struct tty_s tty;
+
+static void tty_new_line(void)
+{
+	tty.cursor.x = 0;
+	if (tty.cursor.y + 1 >= tty.cursor.max.y)
+	{
+		dscroll(KERNEL_FONT_REAL_HEIGHT + 1);
+		return;
+	}
+	tty.cursor.y = tty.cursor.y + 1;
+	return;
+}
+
+static void tty_update_cursor(void)
+{
+	tty.cursor.x = tty.cursor.x + 1;
+	if (tty.cursor.x >= tty.cursor.max.x)
+		tty_new_line();
+}
+
+int tty_write(char const *str, ...)
+{
+	int i;
+
+	// Do not handle strig format for now.
+	
+	// Display string format.
+	i = -1;
+	while (str[++i] != '\0')
+	{
+		// Check new line char.
+		if (str[i] == '\n')
+			tty_new_line();
+		// Display char.
+		dascii(
+			tty.cursor.x * (KERNEL_FONT_REAL_WIDTH + 1),
+			tty.cursor.y * (KERNEL_FONT_REAL_HEIGHT + 1),
+			str[i]
+		);
+		tty_update_cursor();
+	}
+	dupdate();
+	return (i);
+}
diff --git a/src/kernel/util/atomic.s b/src/kernel/util/atomic.s
new file mode 100644
index 0000000..6d7b28a
--- /dev/null
+++ b/src/kernel/util/atomic.s
@@ -0,0 +1,27 @@
+.global	_atomic_start
+.global	_atomic_end
+
+.type	_atomic_start, @function
+.type	_atomic_end, @function
+
+.align 2
+_atomic_start:
+	stc	sr, r1		! Get SR register.
+	mov.l	.bl_mask, r0	! Get SR.BL mask.
+	or	r0, r1		! Set SR.BL to 1.
+	ldc	r1, sr		! Update SR register.
+	rts			! Exit.
+	nop			! (db) nop.
+
+_atomic_end:
+	stc	sr, r1		! Get SR regiter.
+	mov.l	.bl_mask, r0	! Get SR.BL register.
+	not	r0, r0		! Get correct mask to remove the SR.BL bit.
+	and	r0, r1		! Set SR.BL to 0.
+	ldc	r1, sr		! Update SR register.
+	rts			! Exit.
+	nop			! (db) nop.
+
+.align 4
+.bl_mask:	.long (1 << 28)
+.end
diff --git a/src/kernel/vbr/exception.c b/src/kernel/vbr/exception.c
new file mode 100644
index 0000000..6fe5a78
--- /dev/null
+++ b/src/kernel/vbr/exception.c
@@ -0,0 +1,38 @@
+#include <lib/display.h>
+
+__attribute__((section(".vhex.exception"), interrupt_handler))
+void exception_handler(void)
+{
+	uint32_t spc;
+	uint32_t ssr;
+	uint32_t sr;
+
+
+	// Get some registers's data.
+	__asm__ volatile (
+		"stc	spc, %0;"
+		"stc	ssr, %1;"
+		"stc	sr, %2"
+		: "=r"(spc), "=r"(ssr), "=r"(sr)
+		:
+		:
+	);
+
+	// Write exception informations.
+	dclear();
+	dprint(0, 0,
+		"Ho crap ! Exception !\n"
+		"tra:    %#x\n"
+		"expevt: %#x\n"
+		"spc:    %#x\n"
+		"ssr:    %#x\n"
+		"sr:     %#x",
+		*((uint32_t *)0xff000020),
+		*((uint32_t *)0xff000024),
+		spc,
+		ssr,
+		sr
+	);
+	dupdate();
+	while (1);
+}
diff --git a/src/kernel/vbr/interrupt.c b/src/kernel/vbr/interrupt.c
new file mode 100644
index 0000000..f1d6f32
--- /dev/null
+++ b/src/kernel/vbr/interrupt.c
@@ -0,0 +1,10 @@
+#include <lib/display.h>
+
+__attribute__((section(".vhex.interrupt"), interrupt_handler))
+void interrupt_handler(void)
+{
+	dclear();
+	dprint(0, 0, "Interrupt handler (%#x)\n", *(uint32_t*)0xff000028);
+	dupdate();
+	while (1);
+}
diff --git a/src/kernel/vbr/tlb.c b/src/kernel/vbr/tlb.c
new file mode 100644
index 0000000..41d6280
--- /dev/null
+++ b/src/kernel/vbr/tlb.c
@@ -0,0 +1,38 @@
+#include <lib/display.h>
+
+__attribute__((section(".glados.tlb"), interrupt_handler))
+void tlb_handler(void)
+{
+	uint32_t spc;
+	uint32_t ssr;
+	uint32_t sr;
+
+
+	// Get some registers's data.
+	__asm__ volatile (
+		"stc	spc, %0;"
+		"stc	ssr, %1;"
+		"stc	sr, %2"
+		: "=r"(spc), "=r"(ssr), "=r"(sr)
+		:
+		:
+	);
+
+	// Write exception informations.
+	dclear();
+	dprint(0, 0,
+		"Ho crap ! Exception !\n"
+		"tra:    %#x\n"
+		"expevt: %#x\n"
+		"spc:    %#x\n"
+		"ssr:    %#x\n"
+		"sr:     %#x",
+		*((uint32_t *)0xff000020),
+		*((uint32_t *)0xff000024),
+		spc,
+		ssr,
+		sr
+	);
+	dupdate();
+	while (1);
+}
diff --git a/src/keys.c b/src/keys.c
deleted file mode 100644
index 36ef02f..0000000
--- a/src/keys.c
+++ /dev/null
@@ -1,170 +0,0 @@
-#include <utils.h>
-#include <syscalls.h>
-#include <command.h>
-#include <string.h>
-
-//
-// check_session()
-// Check if the pressed key is [Fx], and switch the current session.
-//
-static int check_session(unsigned int key, struct vhex_s *vhex)
-{
-	static const unsigned int keys_switch[SESSIONS_SLOT] = {
-		KEY_F1, KEY_F2, KEY_F3,
-		KEY_F4, KEY_F5, KEY_F6
-	};
-	size_t i;
-
-	i = -1;
-	while (++i < SESSIONS_SLOT && key != keys_switch[i]);
-	if (i < SESSIONS_SLOT){
-		vhex->current_session = i;
-		return (0);
-	}
-	return (-1);
-}
-
-//
-// check_special()
-// As explained below, the Casio getkey function has an internal status.
-// Here we check if a "special" keys are pressed and update internal Vhex
-// "keyboard's status".
-//
-static int check_special(unsigned int key, struct vhex_s *vhex, struct session_s *session)
-{
-	if (!(key == KEY_OPTN || key == KEY_SHIFT || key == KEY_ALPHA))
-		return (-1);
-	if (vhex->insert.mode == LETTER){
-		vhex->insert.mode = NUMBER;
-		if (key == KEY_ALPHA)
-			return (0);
-	}
-	if (key == KEY_OPTN){
-		if (session->mode != COMMAND){
-			memset(vhex->info, '\0', CMD_LENGHT_MAX);
-			session->mode = COMMAND;
-			save_window(1);
-		}
-		else
-			session->mode = (session->anchor == 0x00000000) ? UNUSED : NORMAL;
-	}
-	if (key == KEY_SHIFT)
-		vhex->insert.mode = (vhex->insert.mode == SHIFT) ? NUMBER : SHIFT;
-	if (key == KEY_ALPHA){
-		//TODO: update this.
-		if (vhex->insert.mode == SHIFT)
-			vhex->insert.mode = CAPS_LOCK;
-		else if (vhex->insert.mode == CAPS_LOCK)
-			vhex->insert.mode = NUMBER;
-		else
-			vhex->insert.mode = LETTER;
-	}
-	return (0);
-}
-
-//
-// check_alphanum()
-// Check if the key pressed is an alphanumeric character and update the user command.
-//
-/* TODO: find better way to do the job (?) */
-static int check_alphanum(unsigned int key, struct vhex_s *vhex, struct session_s *session)
-{
-	static const unsigned int keys_alpha[] = {
-		KEY_A, KEY_B, KEY_C, KEY_D, KEY_E, KEY_F, KEY_G, KEY_H,
-		KEY_I, KEY_J, KEY_K, KEY_L, KEY_M, KEY_N, KEY_O, KEY_P,
-		KEY_Q, KEY_R, KEY_S, KEY_T, KEY_U, KEY_V, KEY_W, KEY_X,
-		KEY_Y, KEY_Z
-	};
-	static const unsigned int keys_number[] = {
-		KEY_0, KEY_1, KEY_2, KEY_3, KEY_4,
-		KEY_5, KEY_6, KEY_7, KEY_8, KEY_9
-	};
-	unsigned int *cache;
-	size_t size;
-	size_t end;
-	size_t i;
-	char buf;
-
-	if (session->mode != COMMAND)
-		return (-1);
-	i = -1;
-	size = strlen(vhex->insert.cmd);
-	end = (vhex->insert.mode == NUMBER) ? 10 : 26; 
-	cache = (vhex->insert.mode == NUMBER) ? (void *)keys_number : (void *)keys_alpha;
-	while (++i < end && key != cache[i]);
-	if (i >= end)
-		return (-1);
-	if (size < CMD_LENGHT_MAX){
-		buf = (vhex->insert.mode == NUMBER) ? '0' + i : 'a' + i;
-		strcat(vhex->insert.cmd, &buf);
-	}
-	if (vhex->insert.mode == LETTER)
-		vhex->insert.mode = NUMBER;
-	vhex->history.offset = 0;
-	return (0);
-}
-
-//
-// check_arrow()
-// Check if the key pressed is an arrow key.
-// Here we just check left and right key, but they do not have the same action when
-// the mode is COMMAND or not; basically:
-// 	* COMMAND	: Udpate the user's command using the history.
-// 	* NORMAL	: Move the anchor cursor.
-// 	* UNUSED	: Do nothing.
-//
-static int check_arrow(unsigned int key, struct vhex_s *vhex, struct session_s *session)
-{
-	if (key != KEY_UP && key != KEY_DOWN)
-		return (-1);
-	if (session->mode == COMMAND
-	&& ((key == KEY_UP && vhex->history.offset < vhex->history.deep)
-	|| (key == KEY_DOWN && vhex->history.offset > 0))){
-		if (vhex->history.offset == 0)
-			strcpy(vhex->insert.backup, vhex->insert.cmd);
-		vhex->history.offset += (key == KEY_UP) ? 1 : -1;
-		if (vhex->history.offset > 0)
-			strcpy(vhex->insert.cmd,
-			history_get(vhex->history.list, vhex->history.offset - 1));
-		else
-			strcpy(vhex->insert.cmd, vhex->insert.backup);
-	}
-	if (session->mode == NORMAL)
-			session->cursor += (key == KEY_UP) ? -1 : 1;
-	return (0);
-}
-
-//
-// key_handling()
-// We need to do several things here; the Casio getkey function handles [SHIFT], [ALPHA]
-// and [MENU] key and it is able to do some special thing using the key combination like
-// shutdown the calculator, change the brightness or return to the main menu using.
-// But when the user press on [SHIFT] or [ALPHA], getkey() return not the same value for
-// the same key (and we cannot know the "status").
-// So we need to "emulate" the getkey's status and execute the appropriate action with
-// the key returned by Casio.
-//
-void key_handling(struct vhex_s *vhex, struct session_s *session, unsigned int key)
-{
-	size_t size;
-
-	if (check_session(key, vhex) == 0
-	|| check_special(key, vhex, session) == 0
-	|| check_arrow(key, vhex, session) == 0
-	|| check_alphanum(key, vhex, session) == 0
-	|| session->mode != COMMAND)
-		return;
-	if (key == KEY_DEL || key == KEY_INS){
-		size = strlen(vhex->insert.cmd);
-		if (size > 0)
-			strncpy(vhex->insert.cmd, vhex->insert.cmd, size - 1);
-	}
-	if (key == KEY_SPACE)
-		strcat(vhex->insert.cmd, " ");
-	if (key == KEY_QUOTE)
-		strcat(vhex->insert.cmd, "\"");
-	if (key == KEY_ENTER){
-		vhex->insert.mode = NUMBER;
-		command_entry(session, vhex);
-	}
-}
diff --git a/src/lib/display/dascii.c b/src/lib/display/dascii.c
new file mode 100644
index 0000000..082fcdb
--- /dev/null
+++ b/src/lib/display/dascii.c
@@ -0,0 +1,109 @@
+#include <lib/display.h>
+#include <kernel/types.h>
+
+static const uint8_t kernel_font_bitmap[] = {
+	0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
+	0xee, 0xee, 0xee, 0xef, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55,
+	0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x56, 0xaa, 0xaa, 0xaa, 0xaa,
+	0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xad,
+	0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55,
+	0x55, 0x55, 0x55, 0x5e, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee,
+	0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xee, 0xe0, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
+	0x2a, 0x92, 0x11, 0x11, 0x28, 0x00, 0x00, 0x38, 0xbb, 0xab, 0xbb, 0xbb,
+	0x80, 0x08, 0x23, 0x02, 0x57, 0x31, 0x52, 0x41, 0x22, 0x00, 0x01, 0x51,
+	0x11, 0x54, 0x41, 0x55, 0x22, 0x27, 0x21, 0x04, 0x0a, 0xc4, 0x40, 0x82,
+	0xae, 0x0e, 0x04, 0xa2, 0xee, 0xee, 0xe2, 0xee, 0x00, 0x80, 0x24, 0x00,
+	0x1c, 0xd1, 0x41, 0x04, 0x08, 0x80, 0x11, 0x45, 0x04, 0x45, 0x45, 0x44,
+	0x88, 0x9c, 0x80, 0x10, 0x2b, 0x09, 0x81, 0x10, 0x02, 0x01, 0x03, 0x8b,
+	0xb8, 0xbb, 0x8b, 0xb8, 0x20, 0x82, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0c, 0xee,
+	0xec, 0xee, 0xea, 0xee, 0xa8, 0xae, 0xee, 0xee, 0x6e, 0xaa, 0xaa, 0xae,
+	0xe0, 0xe4, 0x05, 0x55, 0x15, 0x11, 0x14, 0x89, 0x51, 0xd5, 0x55, 0x55,
+	0x09, 0x55, 0x55, 0x45, 0x10, 0x54, 0x0b, 0xb2, 0x2b, 0xba, 0xb9, 0x13,
+	0x22, 0xaa, 0xba, 0xb3, 0x92, 0xaa, 0x91, 0x12, 0x10, 0x80, 0x55, 0x54,
+	0x54, 0x45, 0x52, 0x25, 0x45, 0x55, 0x47, 0x51, 0x25, 0x57, 0x52, 0x44,
+	0x11, 0x00, 0xca, 0xee, 0xce, 0x8e, 0xae, 0xca, 0xea, 0xae, 0x8e, 0xac,
+	0x4e, 0x4a, 0xa4, 0xee, 0x0e, 0x0e, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+	0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x12, 0x00,
+	0x90, 0x9a, 0x11, 0x23, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x19,
+	0x30, 0x39, 0x14, 0x31, 0x52, 0x54, 0x00, 0x42, 0x76, 0x26, 0x35, 0x37,
+	0x55, 0x55, 0x57, 0x22, 0x20, 0x70, 0x6c, 0x86, 0xee, 0x6c, 0xc4, 0xa4,
+	0xea, 0xaa, 0xac, 0xc4, 0xaa, 0xa4, 0xa4, 0x84, 0x26, 0xe1, 0x55, 0x15,
+	0x08, 0x54, 0x89, 0x89, 0x55, 0x58, 0xd0, 0x49, 0x55, 0xd4, 0x90, 0x88,
+	0x99, 0xc1, 0xb1, 0x99, 0x93, 0x2b, 0xb2, 0x9a, 0xa9, 0x20, 0xa3, 0x19,
+	0x92, 0xa9, 0x39, 0x93, 0x03, 0x80
+};
+
+void dascii(int x, int y, char const c)
+{
+	off_t bitmap_offset_x;
+	off_t bitmap_offset_y;
+	off_t vram_offset_y;
+	int real_width;
+	int real_height;
+	uint8_t pixel_test;
+	int pixel_cursor;
+	int i;
+	int j;
+
+	// Calculate the charactere position (bitmap)
+	bitmap_offset_y = (c / KERNEL_FONT_NB_CHAR_X) * (KERNEL_FONT_BITMAP_WIDTH * KERNEL_FONT_BITMAP_CHEIGHT);
+	bitmap_offset_x = (c - ((c / KERNEL_FONT_NB_CHAR_X) * KERNEL_FONT_NB_CHAR_X)) * KERNEL_FONT_BITMAP_CWIDTH;
+
+	// Set default size.
+	real_width = KERNEL_FONT_REAL_WIDTH;
+	real_height = KERNEL_FONT_REAL_HEIGHT;
+
+	// Check X axis culling.
+	if (x < 0)
+	{
+		bitmap_offset_x = bitmap_offset_x + x;
+		real_width = KERNEL_FONT_REAL_WIDTH + x;
+		x = 0;
+	}
+	else if (x + KERNEL_FONT_REAL_WIDTH >= DISPLAY_SCREEN_WIDTH)
+		real_width = DISPLAY_SCREEN_WIDTH - x;
+
+	// Check Y axis culling.
+	if (y < 0)
+	{
+		real_height = KERNEL_FONT_REAL_HEIGHT + y;
+		bitmap_offset_y = bitmap_offset_y + ((-y) * KERNEL_FONT_BITMAP_WIDTH);
+		y = 0;
+	}
+	else if (y + KERNEL_FONT_REAL_HEIGHT >= DISPLAY_SCREEN_HEIGHT)
+		real_height = DISPLAY_SCREEN_HEIGHT - y;
+
+	// Check potential error.
+	// @note we do not check real_height because the while() while do the job for us.
+	if (real_width < 0)
+		return;
+
+	// Calculate VRAM buffer starting position.
+	// @note:
+	// 	The screen width size is always 128 and we
+	// 	use 4-aligned Video RAM so 32 pixel per "slot"
+	// 	and 128 / 32 = 4
+	// 	y * 4 can be optimised by used shift operator
+	// 	this is why we use y << 2 because 2^2 = 4.
+	vram_offset_y = y << 2;
+
+	// Draw character, pixer per pixel... (x_x)
+	i = -1;
+	while (++i < real_height)
+	{
+		j = -1;
+		while (++j < real_width)
+		{
+			pixel_cursor = bitmap_offset_x + bitmap_offset_y + j;
+			pixel_test = 0x80 >> (pixel_cursor & 0x07);
+			if (pixel_test & kernel_font_bitmap[pixel_cursor >> 3])
+			{
+				VRAM[((x + j) >> 5) + vram_offset_y] |= 0x80000000 >> ((x + j) & 0x1f);
+			}
+		}
+		bitmap_offset_y = bitmap_offset_y + KERNEL_FONT_BITMAP_WIDTH; 
+		vram_offset_y = vram_offset_y + 4;
+	}
+}
diff --git a/src/lib/display/dclear.c b/src/lib/display/dclear.c
new file mode 100644
index 0000000..1490b75
--- /dev/null
+++ b/src/lib/display/dclear.c
@@ -0,0 +1,10 @@
+#include <lib/display.h>
+
+void dclear(void)
+{
+	int i;
+
+	i = 256;
+	while (--i >= 0)
+		VRAM[i] = 0x00000000;
+}
diff --git a/src/lib/display/dprint.c b/src/lib/display/dprint.c
new file mode 100644
index 0000000..b790ca5
--- /dev/null
+++ b/src/lib/display/dprint.c
@@ -0,0 +1,31 @@
+#include <lib/stdio.h>
+#include <lib/display.h>
+#include <stdarg.h>
+
+void dprint(int x, int y, char const *str, ...)
+{
+	char buffer[512];
+	int default_pos_x;
+	va_list ap;
+	int i;
+
+	// printf string manipulation.
+	// TODO: remove me !
+	va_start(ap, str);
+	vsprintf(buffer, str, ap);
+	va_end(ap);
+
+	i = -1;
+	default_pos_x = x;
+	while (buffer[++i] != '\0')
+	{
+		if (buffer[i] == '\n')
+		{
+			y = y + KERNEL_FONT_REAL_HEIGHT + 1;
+			x = default_pos_x;
+			continue;
+		}
+		dascii(x, y, buffer[i]);
+		x = x + KERNEL_FONT_REAL_WIDTH + 1;
+	}
+}
diff --git a/src/lib/display/dscroll.c b/src/lib/display/dscroll.c
new file mode 100644
index 0000000..a371a34
--- /dev/null
+++ b/src/lib/display/dscroll.c
@@ -0,0 +1,26 @@
+#include <lib/display.h>
+
+void dscroll(int lines)
+{
+	int i;
+
+	// Scoll n lines
+	i = 0;
+	while ((i >> 2) < 63 - lines)
+	{
+		VRAM[i + 0] = VRAM[i + (lines << 2) + 0];
+		VRAM[i + 1] = VRAM[i + (lines << 2) + 1];
+		VRAM[i + 2] = VRAM[i + (lines << 2) + 2];
+		VRAM[i + 3] = VRAM[i + (lines << 2) + 3];
+		i = i + 4;
+	}
+	// Clear last n lines
+	while ((i >> 2) < 64)
+	{
+		VRAM[i + 0] = 0x0000;
+		VRAM[i + 1] = 0x0000;
+		VRAM[i + 2] = 0x0000;
+		VRAM[i + 3] = 0x0000;
+		i = i + 4;
+	}
+}
diff --git a/src/lib/display/dupdate.c b/src/lib/display/dupdate.c
new file mode 100644
index 0000000..1ec82a9
--- /dev/null
+++ b/src/lib/display/dupdate.c
@@ -0,0 +1,8 @@
+#include <lib/display.h>
+#include <kernel/hardware/t6k11.h>
+
+//FIXME: Check OS 3.00 !
+void dupdate(void)
+{
+	t6k11_display(VRAM);
+}
diff --git a/src/lib/stdio/sprintf.c b/src/lib/stdio/sprintf.c
new file mode 100644
index 0000000..a9bcdd0
--- /dev/null
+++ b/src/lib/stdio/sprintf.c
@@ -0,0 +1,10 @@
+#include <lib/stdio.h>
+
+void sprintf(char *str, char const *format, ...)
+{
+	va_list ap;
+
+	va_start(ap, format);
+	vsprintf(str, format, ap);
+	va_end(ap);
+}
diff --git a/src/string/sprintf.c b/src/lib/stdio/vsprintf.c
similarity index 88%
rename from src/string/sprintf.c
rename to src/lib/stdio/vsprintf.c
index 483de7c..1e24a9d 100644
--- a/src/string/sprintf.c
+++ b/src/lib/stdio/vsprintf.c
@@ -1,4 +1,4 @@
-#include <string.h>
+#include <lib/stdio.h>
 
 static size_t strbase(char *dest, uint32_t nb, size_t size, int base)
 {
@@ -43,7 +43,7 @@ static size_t strndump(char *dest, char const *str, size_t size)
 	return (i);
 }
 
-__attribute__((weak)) void vsprintf(char *str, char const *format, va_list ap)
+void vsprintf(char *str, char const *format, va_list ap)
 {
 	size_t size;
 	size_t len;
@@ -102,12 +102,3 @@ __attribute__((weak)) void vsprintf(char *str, char const *format, va_list ap)
 	}
 	*str = '\0';
 }
-
-__attribute__((weak)) void sprintf(char *str, char const *format, ...)
-{
-	va_list ap;
-
-	va_start(ap, format);
-	vsprintf(str, format, ap);
-	va_end(ap);
-}
diff --git a/src/lib/string/memcpy.c b/src/lib/string/memcpy.c
new file mode 100644
index 0000000..f8cc900
--- /dev/null
+++ b/src/lib/string/memcpy.c
@@ -0,0 +1,9 @@
+#include <lib/string.h>
+#include <lib/display.h>
+
+void *memcpy(void *dest, const void *src, size_t count)
+{
+	for (size_t i = 0 ; i < count ; i = i + 1)
+		((uint8_t*)dest)[i] = ((uint8_t*)src)[i];
+	return (dest);
+}
diff --git a/src/string/memset.c b/src/lib/string/memset.c
similarity index 51%
rename from src/string/memset.c
rename to src/lib/string/memset.c
index 6392c74..6c20f8a 100644
--- a/src/string/memset.c
+++ b/src/lib/string/memset.c
@@ -1,7 +1,7 @@
-#include <utils.h>
+#include <lib/string.h>
 
 //TODO: update me :(
-__attribute__((weak)) void *memset(void *s, int c, size_t n)
+void *memset(void *s, int c, size_t n)
 {
 	while ((int)--n >= 0)
 		((uint8_t*)s)[n] = c;
diff --git a/src/string/strcat.c b/src/lib/string/strcat.c
similarity index 73%
rename from src/string/strcat.c
rename to src/lib/string/strcat.c
index c1c1419..5cc1601 100644
--- a/src/string/strcat.c
+++ b/src/lib/string/strcat.c
@@ -1,6 +1,6 @@
-#include <string.h>
+#include <lib/string.h>
 
-__attribute__((weak)) char *strcat(char *dest, char const *src)
+char *strcat(char *dest, char const *src)
 {
 	size_t i;
 	size_t start;
diff --git a/src/lib/string/strcmp.c b/src/lib/string/strcmp.c
new file mode 100644
index 0000000..e225db5
--- /dev/null
+++ b/src/lib/string/strcmp.c
@@ -0,0 +1,13 @@
+#include <lib/string.h>
+
+int strcmp(const char *s1, const char *s2)
+{
+	if (s1 == NULL || s2 == NULL)
+		return (0);
+	while (*s1 != '\0' && *s2 != '\0' && *s1 == *s2)
+	{
+		s1 += 1;
+		s2 += 1;
+	}
+	return (*s1 - *s2);
+}
diff --git a/src/string/strcpy.c b/src/lib/string/strcpy.c
similarity index 66%
rename from src/string/strcpy.c
rename to src/lib/string/strcpy.c
index f5e78ff..a9eb95d 100644
--- a/src/string/strcpy.c
+++ b/src/lib/string/strcpy.c
@@ -1,6 +1,6 @@
-#include <string.h>
+#include <lib/string.h>
 
-__attribute__((weak)) char *strcpy(char *dest, char const *src)
+char *strcpy(char *dest, char const *src)
 {
 	size_t i;
 
@@ -13,7 +13,7 @@ __attribute__((weak)) char *strcpy(char *dest, char const *src)
 	return (dest);
 }
 
-__attribute__((weak)) char *strncpy(char *dest, char const *str, size_t size)
+char *strncpy(char *dest, char const *str, size_t size)
 {
 	size_t i;
 
diff --git a/src/string/strlen.c b/src/lib/string/strlen.c
similarity index 57%
rename from src/string/strlen.c
rename to src/lib/string/strlen.c
index 56cf1c6..d151965 100644
--- a/src/string/strlen.c
+++ b/src/lib/string/strlen.c
@@ -1,6 +1,6 @@
-#include <string.h>
+#include <lib/string.h>
 
-__attribute__((weak)) size_t strlen(char const *str)
+size_t strlen(char const *str)
 {
 	size_t i;
 
diff --git a/src/main.c b/src/main.c
deleted file mode 100644
index 74f9613..0000000
--- a/src/main.c
+++ /dev/null
@@ -1,49 +0,0 @@
-#include <utils.h>
-#include <string.h>
-#include <syscalls.h>
-
-//
-// vhex_constructor()
-// Initialize all information needed by the add-in: session,
-// GetKey configuration, ...
-//
-static void vhex_constructor(struct vhex_s *vhex)
-{
-	size_t i;
-
-	i = -1;
-	memset(vhex->info, '\0', CMD_LENGHT_MAX);
-	memset(vhex->insert.cmd, '\0', CMD_LENGHT_MAX);
-	//TODO: Auto detect GetKey configuration !!
-	vhex->insert.mode = NUMBER;
-	vhex->history.list = NULL;
-	vhex->history.offset = 0;
-	vhex->history.deep = 0;
-	vhex->current_session = 0;
-	while (++i < SESSIONS_SLOT){
-		vhex->session[i].mode = UNUSED;
-		vhex->session[i].anchor = 0x00000000;
-	}
-}
-
-//
-// main()
-// User entry, but we need to initialize some information before
-// starting the "main loop".
-//
-int main(void)
-{
-	struct vhex_s vhex;
-	unsigned int key;
-
-	key = 0;
-	vhex_constructor(&vhex);
-	while (1){
-		dclear();
-		display_instructions(&vhex.session[vhex.current_session]);
-		display_metainfos(&vhex, &vhex.session[vhex.current_session]);
-		getkey(&key);
-		key_handling(&vhex, &vhex.session[vhex.current_session], key);
-	}
-	return (0);
-}
diff --git a/src/string/atoi_base.c b/src/string/atoi_base.c
deleted file mode 100644
index f949050..0000000
--- a/src/string/atoi_base.c
+++ /dev/null
@@ -1,31 +0,0 @@
-#include <string.h>
-
-static INLINE int check_base(char n, int base)
-{
-	char max;
-
-	max = (base <= 10) ? '0' + base - 1 : ('a' + base - 11);
-	return ((max < n));
-}
-
-//
-// atoi_base()
-// Wrapped atoi function that takes the base which the number
-// (stored in the string) are encoded 
-//
-uint32_t atoi_base(char const *str, int base)
-{
-	uint32_t result;
-	size_t start;
-
-	start = -1;
-	result = 0;
-	while (str[++start] != '\0' && check_base(str[start], base) == 0){
-		result *= base;
-		if (str[start] <= '9')
-			result += str[start] - '0';
-		else
-			result += (str[start] - 'a') + 10;
-	}
-	return (result);
-}
diff --git a/src/string/strcmp.c b/src/string/strcmp.c
deleted file mode 100644
index f0e7635..0000000
--- a/src/string/strcmp.c
+++ /dev/null
@@ -1,12 +0,0 @@
-#include <string.h>
-
-__attribute__((weak)) int strcmp(const char *s1, const char *s2)
-{
-	if (s1 == NULL || s2 == NULL)
-		return (0);
-	while (*s1 != '\0' && *s2 != '\0' && *s1 == *s2){
-		s1 += 1;
-		s2 += 1;
-	}
-	return (*s1 - *s2);
-}
diff --git a/src/string/strtotab.c b/src/string/strtotab.c
deleted file mode 100644
index a5efe7c..0000000
--- a/src/string/strtotab.c
+++ /dev/null
@@ -1,143 +0,0 @@
-#ifndef DEBUG
-//# include <commands.h>
-# include <syscalls.h>
-#else
-//# include "commands.h"
-# include <stdlib.h>
-# include <stdio.h>
-#endif
-#include <string.h>
-#include <errno.h>
-
-// Internal prototypes.
-extern int strtotab(int *argc, char ***argv, char const *str);
-extern void strtotab_quit(int *argc, char ***argv);
-
-//
-// parser_get_word()
-// Get the word at the current cursor location.
-//
-static ssize_t parser_get_word(char ***tab, size_t *tab_pos,
-char const *str, int *counter)
-{
-	ssize_t i;
-
-	i = -1;
-	while (str[++i] != '\0' && str[i] != '\n' && str[i] != ' ' && str[i] != '\t');
-	if (*tab != NULL){
-		(*tab)[*tab_pos] = (char*)malloc(i + 1);
-		if ((*tab)[*tab_pos] == NULL)
-			return (-1);
-		memset((*tab)[*tab_pos], 0, i + 1);
-		strncpy((*tab)[(*tab_pos)++], str, i);
-	}
-	(*counter)++;
-	return (i);
-}
-
-//
-// parser_get_inibitor()
-// This function will get the content of an inhibitor (and check if the
-// inhibitor characteres are alone or not).
-//
-static ssize_t parser_get_inibitor(char ***tab, size_t *tab_pos,
-char const *str, int *counter)
-{
-	ssize_t i;
-
-	i = 0;
-	while (str[++i] != '\0' && str[i] != '\"');
-	if (str[i] != '\"')
-		return (0);
-	if (*tab != NULL){
-		(*tab)[*tab_pos] = (char*)malloc(i + 1);
-		if ((*tab)[*tab_pos] == NULL)
-			return (-1);
-		memset((*tab)[*tab_pos], 0, i + 1);
-		strncpy((*tab)[(*tab_pos)++], str + 1, i - 1);
-	}
-	(*counter)++;
-	return (i + 1);
-}
-
-//
-// parser_setup_arg()
-// This function removes useless spaces, tabs and handle '\"' inhibitor.
-// Return the number of word(s) stored in "str".
-//
-static int parser_entry(char ***tab, char const *str)
-{
-	size_t tab_pos;
-	ssize_t size;
-	int counter;
-
-	str--;
-	counter = 0;
-	tab_pos = 0;
-	while (*(++str) != '\0' && *str != '\n'){
-		if (*str == '\"'){
-			size = parser_get_inibitor(tab, &tab_pos, str, &counter);
-			if (size < 0)
-				return (-1);
-			str += size;
-		}
-		if (*str != ' ' && *str != '\t'){
-			size = parser_get_word(tab, &tab_pos, str, &counter) - 1;
-			if (size < 0)
-				return (-1);
-			str += size;
-		}
-	}
-	return (counter);
-}
-
-//
-// strtotab()
-// Generate word table and indicated the number of word find in the string.
-//
-int strtotab(int *argc, char ***argv, char const *str)
-{
-	int i;
-
-	// Check memory fault.
-	if (argc == NULL || argv == NULL || str == NULL)
-		return (EFAULT);
-
-	// Get the number of word.
-	*argv = NULL;
-	*argc = parser_entry(argv, str);
-	if (*argc <= 0)
-		return (EINVAL);
-
-	// Alloc tab.
-	*argv = (char **)malloc(sizeof(char *) * (*argc + 1));
-	if (*argv == NULL)
-		return (ENOMEM);
-	i = *argc;
-	while (--i >= 0)
-		(*argv)[i] = NULL;
-
-	// Get word.
-	if (parser_entry(argv, str) != *argc){
-		strtotab_quit(argc, argv);
-		return (ENOMEM);
-	}
-	(*argv)[*argc] = NULL;
-	return (0);
-}
-
-/* strtotab() - Free all allocated memory generated by "strtotab()" */
-void strtotab_quit(int *argc, char ***argv)
-{
-	if (argc == NULL || argv == NULL)
-		return;
-	if (*argv == NULL){
-		*argc = 0;
-		return;
-	}
-	while (--(*argc) >= 0)
-		free((*argv)[*argc]);
-	free(*argv);
-	*argv = NULL;
-	*argc = 0;
-}
diff --git a/src/syscalls.s b/src/syscalls.s
deleted file mode 100644
index 70c827b..0000000
--- a/src/syscalls.s
+++ /dev/null
@@ -1,98 +0,0 @@
-.global	_casio_GetKey
-.global	_casio_PrintMini
-.global	_casio_Bdisp_PutDisp_DD
-.global	_casio_Bdisp_AllClr_VRAM
-.global	_casio_Bdisp_DrawLine_VRAM
-.global	_casio_Bdisp_AreaClr_VRAM
-.global	_casio_RestoreDisp
-.global	_casio_SaveDisp
-.global	_casio_Malloc
-.global	_casio_Free
-
-.type	_casio_GetKey, @function
-.type	_casio_PrintMini, @function
-.type	_casio_Bdisp_PutDisp_DD, @function
-.type	_casio_Bdisp_AllClr_VRAM, @function
-.type	_casio_Bdisp_DrawLine_VRAM, @function
-.type	_casio_Bdisp_AreaClr_VRAM, @function
-.type	_casio_RestoreDisp, @function
-.type	_casio_SaveDisp, @function
-.type	_casio_Malloc, @function
-.type	_casio_Free, @function
-
-.align 2
-_casio_GetKey:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_getkey, r0
-	jmp @r1
-	nop
-	
-_casio_PrintMini:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_printMini, r0
-	jmp @r1
-	nop
-
-_casio_Bdisp_AllClr_VRAM:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_clear, r0
-	jmp @r1
-	nop
-
-_casio_Bdisp_PutDisp_DD:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_display, r0
-	jmp @r1
-	nop
-
-_casio_Bdisp_DrawLine_VRAM:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_line, r0
-	jmp @r1
-	nop
-
-_casio_Bdisp_AreaClr_VRAM:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_clear_area, r0
-	jmp @r1
-	nop
-
-_casio_RestoreDisp:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_restore_disp, r0
-	jmp @r1
-	nop
-
-_casio_SaveDisp:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_save_disp, r0
-	jmp @r1
-	nop
-
-_casio_Malloc:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_malloc, r0
-	jmp @r1
-	nop
-
-_casio_Free:
-	mov.l	.syscall_tab, r1
-	mov.l	.sys_free, r0
-	jmp @r1
-	nop
-
-
-.align 4
-.syscall_tab:		.long 0x80010070
-.sys_line:		.long 0x00000030
-.sys_clear:		.long 0x00000143 /*Bdisp_AllClr_VRAM */
-.sys_getkey:		.long 0x0000090f
-.sys_display:		.long 0x00000028
-.sys_printMini:		.long 0x00000c4f
-.sys_clear_area:	.long 0x0000014b
-.sys_restore_disp:	.long 0x00000814
-.sys_save_disp:		.long 0x00000813
-.sys_malloc:		.long 0x00000acd
-.sys_free:		.long 0x00000acc
-
-.end
diff --git a/src/user/main.c b/src/user/main.c
new file mode 100644
index 0000000..0f94379
--- /dev/null
+++ b/src/user/main.c
@@ -0,0 +1,34 @@
+#include <lib/stdio.h>
+#include <lib/display.h>
+#include <kernel/tty.h>
+
+int main(void)
+{
+	char *line;
+
+	// Open TTY and display entry message
+	tty_open();
+	tty_write("Welcome to Vhex !\n");
+
+	// Main loop
+	while (1)
+	{
+		// Write input indications.
+		// TODO: write current working directory ?
+		tty_write(">");
+
+		// Get each line writen by the user.
+		/*nbread = getline(&line, &size, 0);
+		if (nbread == EOF)
+		{
+			// TODO: check jobs ?
+			break;
+		}*/
+
+		// TODO: do some job.
+	}
+
+	// Close TTY and return.
+	tty_close();
+	return (0);
+}
diff --git a/tests/atoi_base_test.c b/tests/atoi_base_test.c
deleted file mode 100644
index 0297d8c..0000000
--- a/tests/atoi_base_test.c
+++ /dev/null
@@ -1,31 +0,0 @@
-#include <criterion/criterion.h>
-
-// Internal prototypes.
-extern uint32_t atoi_base(char const *str, int base);
-
-Test(atoi_base, base_10)
-{
-	uint32_t result;
-
-	result = atoi_base("12345", 10);
-	cr_assert_eq(result, 12345, "returned: %d\n", result);
-	cr_assert_eq(atoi_base("50926", 10), 50926);
-	cr_assert_eq(atoi_base("999999", 10), 999999);
-}
-
-Test(atoi_base, base_16)
-{
-	uint32_t result;
-
-	result = atoi_base("abcdef", 16);
-	cr_assert_eq(result, 0xabcdef, "returned: %#x\n", result);
-	cr_assert_eq(atoi_base("50926", 16), 0x50926);
-	cr_assert_eq(atoi_base("999999", 16), 0x999999);
-}
-
-Test(atoi_base, base_error)
-{
-	cr_assert_eq(atoi_base("xxxxxx", 16), 0);
-	cr_assert_eq(atoi_base("50926x56", 16), 0x50926);
-	cr_assert_eq(atoi_base("o", 16), 0);
-}
diff --git a/tests/history_test.c b/tests/history_test.c
deleted file mode 100644
index dac857f..0000000
--- a/tests/history_test.c
+++ /dev/null
@@ -1,52 +0,0 @@
-#include <criterion/criterion.h>
-#include "tests/internal.h"
-#include "history.h"
-#include <errno.h>
-
-
-//TODO: write doc.
-
-Test(history, add)
-{
-	struct node *list;
-
-	list = NULL;
-	cr_assert_eq(history_update(&list, "ls -l"), 0);
-	cr_assert_eq(history_update(&list, "cat -e"), 0);
-	cr_assert_eq(history_update(NULL, "cat -e"), EFAULT);
-	// malloc fails.
-	malloc_hook_update(FAIL_NEXT);
-	cr_assert_eq(history_update(&list, "cat -e"), ENOMEM);
-
-	// Check info.
-	cr_assert_str_eq(list->data, "cat -e");
-	cr_assert_str_eq(list->next->data, "ls -l");
-	cr_assert_null(list->next->next);
-}
-
-Test(history, get)
-{
-	struct node *list;
-
-	list = NULL;
-	history_update(&list, "ls -l");
-	history_update(&list, "cat -e");
-	cr_assert_str_eq(history_get(list, 1), "ls -l");
-	cr_assert_str_eq(history_get(list, 0), "cat -e");
-	cr_assert_null(history_get(list, 4));
-}
-
-Test(history, quit)
-{
-	struct node *list;
-
-	list = NULL;
-	history_quit(&list);
-	history_update(&list, "ls -l");
-	history_update(&list, "cat -e");
-	history_update(&list, "test");
-	history_update(&list, "yes");
-	history_quit(&list);
-	history_quit(NULL);
-	cr_assert_null(list);
-}
diff --git a/tests/internal.h b/tests/internal.h
deleted file mode 100644
index ff3b006..0000000
--- a/tests/internal.h
+++ /dev/null
@@ -1,25 +0,0 @@
-#ifndef __INTERNAL_H__
-# define __INTERNAL_H__
-
-#include <stddef.h>
-#include <stdint.h>
-
-//
-// status_t - all status available for hook.
-//	* FAIL_NONE	: force malloc to work normaly.
-//	* FAIL_NEXT	: force the next call of malloc to return NULL.
-//	* FAIL_NEXT_DYN	: force X-nth call of malloc to return NULL.
-//	* FAIL_ALWAYS	: force all malloc to return NULL.
-//
-typedef enum status_e
-{
-	FAIL_NONE,
-	FAIL_NEXT,
-	FAIL_ALWAYS,
-	FAIL_NEXT_DYN
-} status_t;
-
-/* malloc_hook_update - udpate the behavior of the malloc hook */
-void malloc_hook_update(status_t status, ...);
-
-#endif /*__INTERNAL_H__*/
diff --git a/tests/malloc_hook.c b/tests/malloc_hook.c
deleted file mode 100644
index fd54d84..0000000
--- a/tests/malloc_hook.c
+++ /dev/null
@@ -1,91 +0,0 @@
-#include "tests/internal.h"
-#include <malloc.h>
-#include <stdarg.h>
-
-// Internal prototypes / static symbols.
-static void my_malloc_init_hook(void);
-static void *my_malloc_hook(size_t size, const void *caller);
-static void *old_malloc_hook;
-static int hook_dyn_fail;
-static int hook_status;
-
-//
-// my_malloc_hook()
-// This function will replace the current malloc hook by our own
-// hook (which can return NULL if we want, it allows us to check
-// the behavior of our code).
-//
-// NOTE:
-// "man __malloc_hook" indicate to use "__malloc_initialize_hook"
-// which will execute the initialization routine. But from glibc 2.24
-// onwards, this variable has been removed from the API.
-// So, this is why we use "constructor" attribute to call our routine
-// at the beginning of the test.
-//
-__attribute__((constructor))
-static void my_malloc_init_hook(void)
-{
-	old_malloc_hook = __malloc_hook;
-	__malloc_hook = my_malloc_hook;
-	hook_status = FAIL_NONE;
-}
-
-//
-// my_malloc_hook()
-// For some tests we need to simulate (properly) a malloc fail; to do this
-// we use a malloc hook and add static variables to force him to return
-// NULL address.
-//
-// NOTE:
-// All hooks of the glibc will be removed because of their poor behavior
-// in multi threaded environment.
-// But recently we have seen that the malloc() function is defined by the
-// weak symbol, so it is probably possible to override malloc() and do
-// the same job.
-//
-static void *my_malloc_hook(size_t size, const void *caller)
-{
-	void *result;
-
-	if (hook_status != FAIL_NONE && hook_status != FAIL_NEXT_DYN){
-		if (hook_status == FAIL_NEXT)
-			hook_status = FAIL_NONE;
-		return (NULL);
-	}
-	if (hook_status == FAIL_NEXT_DYN){
-		hook_dyn_fail -= 1;
-		if (hook_dyn_fail <= 0){
-			hook_status = FAIL_NONE;
-			return (NULL);
-		}
-	}
-	__malloc_hook = old_malloc_hook;
-	result = malloc(size);
-	(void)caller;
-	//printf("caller: %p - area: %p\n", caller, result);
-	old_malloc_hook = __malloc_hook;
-	__malloc_hook = my_malloc_hook;
-	return (result);
-}
-
-//
-// malloc_hook_udpate()
-// This function is the only way to interact with the hook; it will
-// define the behavior of malloc:
-//	* FAIL_NEXT	: force the next call of malloc to return NULL.
-//	* FAIL_NEXT_DYN	: force X-nth call of malloc to return NULL.
-//	* FAIL_ALWAYS	: force all malloc return NULL.
-//	* FAIL_NONE	: force malloc to work normally.
-//
-void malloc_hook_update(status_t status, ...)
-{
-	va_list ap;
-
-	hook_dyn_fail = 0;
-	if (status == FAIL_NEXT_DYN){
-		va_start(ap, status);
-		hook_dyn_fail = va_arg(ap, int);
-		va_end(ap);
-	}
-	hook_status = status;
-}
diff --git a/tests/strtab_test.c b/tests/strtab_test.c
deleted file mode 100644
index 9372bdf..0000000
--- a/tests/strtab_test.c
+++ /dev/null
@@ -1,108 +0,0 @@
-#include <criterion/criterion.h>
-#include "tests/internal.h"
-#include <errno.h>
-
-// Internal prototypes.
-extern int strtotab(int *argc, char ***argv, char const *str);
-extern void strtotab_quit(int *argc, char ***argv);
-
-Test(strtotab, quote)
-{
-	char **argv;
-	int argc;
-	int ret;
-
-	ret = strtotab(&argc, &argv, "hey? \"What's \nup?\" yo!\"\n");
-	cr_expect_eq(ret, 0);
-	cr_expect_eq(argc, 3);
-	cr_assert_str_eq(argv[0], "hey?");
-	cr_assert_str_eq(argv[1], "What's \nup?");
-	cr_assert_str_eq(argv[2], "yo!\"");
-}
-
-Test(strtotab, noword)
-{
-	char **argv;
-	int argc;
-	int ret;
-
-	ret = strtotab(&argc, &argv, "");
-	cr_expect_eq(ret, EINVAL);
-	cr_expect_eq(argc, 0);
-	cr_assert_null(argv);
-}
-
-Test(strtotab, entry_error)
-{
-	char **argv;
-	int argc;
-	int ret;
-
-	ret = strtotab(NULL, &argv, "aaaaaaaaa aa");
-	cr_expect_eq(ret, EFAULT);
-	ret = strtotab(&argc, NULL, "aaaaaaaaa aa");
-	cr_expect_eq(ret, EFAULT);
-	ret = strtotab(&argc, &argv, NULL);
-	cr_expect_eq(ret, EFAULT);
-}
-
-Test(strtotab, spaces_tabs)
-{
-	char **argv;
-	int argc;
-	int ret;
-
-	ret = strtotab(&argc, &argv, "hey?            What's\t\t \t  up?");
-	cr_expect_eq(ret, 0);
-	cr_expect_eq(argc, 3);
-	cr_assert_str_eq(argv[0], "hey?");
-	cr_assert_str_eq(argv[1], "What's");
-	cr_assert_str_eq(argv[2], "up?");
-}
-
-Test(strtotab, normal)
-{
-	char **argv;
-	int argc;
-	int ret;
-
-	ret = strtotab(&argc, &argv, "hey? What's up?\n");
-	cr_expect_eq(ret, 0);
-	cr_assert_eq(argc, 3);
-	cr_assert_str_eq(argv[0], "hey?");
-	cr_assert_str_eq(argv[1], "What's");
-	cr_assert_str_eq(argv[2], "up?");
-}
-
-Test(strtotab, alloc_fails)
-{
-	char **argv;
-	int argc;
-	int ret;
-
-	malloc_hook_update(FAIL_NEXT);
-	ret = strtotab(&argc, &argv, "hey? \"What's up?");
-	cr_assert_eq(ret, ENOMEM);
-	malloc_hook_update(FAIL_NEXT_DYN, 2);
-	ret = strtotab(&argc, &argv, "hey? \"What's up?");
-	cr_assert_eq(ret, ENOMEM);
-	malloc_hook_update(FAIL_NEXT_DYN, 2);
-	ret = strtotab(&argc, &argv, "\"What's\" up?");
-	cr_assert_eq(ret, ENOMEM);
-
-}
-
-Test(strtotab, quit)
-{
-	char **argv;
-	int argc;
-
-	strtotab(&argc, &argv, "hey? What's up?");
-	strtotab_quit(&argc, &argv);
-	cr_assert_eq(argc, 0);
-	cr_assert_null(argv);
-	strtotab_quit(NULL, &argv);
-	strtotab_quit(&argc, NULL);
-	argv = NULL;
-	strtotab_quit(&argc, &argv);
-}
diff --git a/vhex.g1a b/vhex.g1a
index 8d620d4..fec54df 100644
Binary files a/vhex.g1a and b/vhex.g1a differ
diff --git a/vhex.ld b/vhex.ld
new file mode 100644
index 0000000..b419ecd
--- /dev/null
+++ b/vhex.ld
@@ -0,0 +1,93 @@
+OUTPUT_ARCH(sh3)
+OUTPUT_FORMAT(elf32-sh)
+ENTRY(_start)
+
+MEMORY
+{
+	/*
+	** bootram is the RAM physical location for global variable
+	** during the bootloader step.
+	** This location is realy important because no Casio's OS data
+	** should be overwrite (specially TLB information stored by Casio).
+	*/
+	bootram	(rwx)	: o = 0x88040000, l = 252k
+	osram	(rwx)	: o = 0x8807f000, l = 4k
+	rom  	(rx)	: o = 0x00300200, l = 512k
+}
+
+SECTIONS
+{
+	/*
+	** ROM sections
+	*/
+	. = ORIGIN(rom);
+	.text	: {
+		*(.pretext)
+		*(.text)
+
+		. = ALIGN(4);
+		*(.rodata)
+		*(.rodata.*)
+	} > rom
+
+
+	/*
+	** RAM sctions
+	*/
+	. = ORIGIN(bootram);
+
+	/* BootStrap Stack: should be wiped later ! */
+	/* (we force the section to be non loadable when the program is run) */
+	.bss (NOLOAD) : {
+		_bbss = . ;
+		*(.bss)
+		*(COMMON)
+		. = ALIGN(4);
+	} > bootram :NONE
+	_sbss = SIZEOF(.bss);
+
+	/* Read-write data going to RAM */
+	.data	: ALIGN(4) {
+		_bdata_rom = LOADADDR(.data) ;
+		_bdata_ram = . ;
+		*(.data)
+
+		/* Video RAM space */
+		_VRAM = ALIGN(4);
+		. = (. + 1024);
+	} > bootram AT> rom
+	_sdata = SIZEOF(.data);
+
+
+	/*
+	** VBR space !
+	*/
+	/* Interrupt / exception handlers */
+	.vhex : SUBALIGN(4) {
+		_bvhex_rom = LOADADDR(.vhex) ;
+		_bvhex_ram = . ;
+		_vhex_vbr = . - 0x100;
+		*(.vhex.exception) ;
+		. = _vhex_vbr + 0x400 ;
+		*(.vhex.tlb) ;
+		. = _vhex_vbr + 0x600 ;
+		*(.vhex.interrupt) ;
+		. = ALIGN(4);
+	} > osram AT> rom
+	_svhex = SIZEOF(.vhex);
+
+	/* unwanted section */
+	/DISCARD/ : {
+		*(.debug_info)
+		*(.debug_abbrev)
+		*(.debug_loc)
+		*(.debug_aranges)
+		*(.debug_ranges)
+		*(.debug_line)
+		*(.debug_str)
+		*(.jcr)
+		*(.eh_frame_hdr)
+		*(.eh_frame)
+		*(.comment)
+	}
+}