diff --git a/.gitignore b/.gitignore
index 767efe3..6caafaa 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,3 @@
-# Sources for old gint versions.
-gint.old.1/**
-gint.old.2/**
-
 # Build directory
 build/**
 
@@ -11,3 +7,6 @@ build/**
 
 # Object files.
 *.o
+
+# Some notes.
+LIBC
diff --git a/Makefile b/Makefile
index 9a01f78..e358b80 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@
 # Modules
 modules-gint	= core keyboard mmu mpu rtc screen timer \
 		  bopti display gray tales
-modules-libc	= setjmp string
+modules-libc	= setjmp string stdio
 
 # Targets
 target-g1a	= gintdemo.g1a
@@ -39,7 +39,7 @@ demo-res	= $(notdir $(wildcard demo/resources/*))
 demo-obj	= $(patsubst %,build/demo_%.o,$(demo-src) $(demo-res))
 demo-elf	= build/gintdemo.elf
 demo-bin	= build/gintdemo.bin
-demo-libs	= -lgcc -L. -lgint -lc
+demo-libs	= -L. -lgint -lc -lgcc
 
 # Specific objects
 obj-lib-spec	= build/display_font_system.bmp.o
diff --git a/Makefile.old b/Makefile.old
deleted file mode 100644
index ea3834a..0000000
--- a/Makefile.old
+++ /dev/null
@@ -1,141 +0,0 @@
-#! /usr/bin/make -f
-
-#---
-#	fx-9860g lib Makefile.
-#---
-
-
-
-#
-#	Variables and configuration.
-#
-
-#  Tools
-cc = sh3eb-elf-gcc
-as = sh3eb-elf-as
-ar = sh3eb-elf-ar
-ob = sh3eb-elf-objcopy
-wr = g1a-wrapper
-
-# Output files
-g1a = ginttest.g1a
-bin = build/ginttest.bin
-elf = build/ginttest.elf
-
-#  Command-line options
-cflags	= -m3 -mb -nostdlib -ffreestanding -W -Wall \
-          -I . -isystem include
-lib	= -lgcc -L. -lgint -lc
-
-
-
-#
-#	Source and object files.
-#
-
-# Gint library.
-src-lib = crt0.c syscalls.s \
-          gint.c gint_vbr.s gint_7705.c gint_7305.c \
-          mpu.c keyboard.c screen.c display.c gray.c timer.c tales.c \
-          bopti.c
-hea-lib = 7305.h 7705.h gint.h \
-          stdlib.h \
-          mpu.h keyboard.h screen.h display.h gray.h timer.h tales.h
-obj-lib = $(patsubst %, build/%.o, $(src-lib))
-hdr-lib = $(patsubst %, include/%, $(hea-lib))
-
-#  Standard library.
-src-std = setjmp.s string.c
-hea-std = setjmp.h string.h ctype.h
-obj-std = $(patsubst %, build/%.o, $(src-std))
-hdr-std = $(patsubst %, include/%, $(hea-str))
-
-#  Test application.
-src-app = ginttest.c
-img-app = bitmap_opt.bmp swords.bmp sprites.bmp symbol.bmp symbol2.bmp \
-          illustration.bmp
-res-app = $(patsubst %, build/%.o, $(img-app)) build/font.o
-
-
-#
-#	Building rules.
-#
-
-all: build libgint.a libc.a ginttest.g1a
-
-build:
-	mkdir -p build
-
-libgint.a: $(obj-lib)
-	$(ar) rcs libgint.a $(obj-lib)
-	@ echo "\033[32;1mLibrary file size: "`stat -c %s libgint.a` \
-		"bytes\033[0m"
-
-libc.a: $(obj-std)
-	$(ar) rcs libc.a $(obj-std)
-	@ echo "\033[32;1mStandard file size: "`stat -c %s libc.a` \
-		"bytes\033[0m"
-
-$(g1a): libgint.a $(src-app) $(res-app)
-	$(cc) $(src-app) $(res-app) -T ginttest.ld -o $(elf) $(cflags) $(lib)
-	$(ob) -R .comment -R .bss -O binary $(elf) $(bin)
-	$(wr) $(bin) -o ginttest.g1a -i icon.bmp
-	@ echo "\033[32;1mBinary file size: "`stat -c %s $(bin)`" bytes\033[0m"
-	@ sh3eb-elf-objdump -h build/ginttest.elf
-
-
-
-#
-#	Resource management.
-#
-
-build/%.c.o: src/%.c $(hdr-lib) $(hdr-std)
-	$(cc) $(cflags) -O2 -c $< -o $@
-
-build/%.s.o: src/%.s
-	$(as) -c $^ -o $@
-
-build/%.bmp.o: resources/%.bmp
-	fxconv $^ -o $@ --preview
-
-build/font.o: resources/font.bmp
-	fxconv --font $^ -o $@
-
-# File gint.c should not be optimized... looks like attribute((interrupt_
-# handler)) doesn't like it. (It could be a gint bug also, I should check.)
-build/gint.c.o: src/gint.c $(hdr-lib) $(hdr-std)
-	$(cc) $(cflags) -c $< -o $@
-
-%.c.o: %.c $(hdr-lib) $(hdr-std)
-	$(cc) $(cflags) -c $< -o $@
-%.s.o: %.s
-	$(as) -c $^ -o $@
-
-
-
-#
-#	Cleaning rules.
-#
-
-clean:
-	@ rm -f $(obj-lib) $(obj-std) $(obj-app) $(res-app)
-	@ rm -f $(bin) $(elf)
-mrproper: clean
-	@ rm -f build/*
-	@ rm -f ginttest.g1a libc.a libgint.a
-distclean: mrproper
-
-re: distclean all
-
-
-
-#
-#	Installing shorthand.
-#
-
-install:
-	usb-connector SEND ginttest.g1a ginttest.g1a fls0
-
-
-
-.PHONY: all clean mrproper distclean re install
diff --git a/README.md b/README.md
index 847a24b..5892e31 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ gint (pronounce 'guin') is a low-level library for fx-9860G calculators. It
 provides the tools needed to develop programs under Linux using the gcc
 toolchain (sh3eb-elf).
 
-By the way, gint is free software ; you may use it for any purpose, share it,
+By the way, gint is free software; you may use it for any purpose, share it,
 modify it and share you changes. No credit of any kind is needed, though
 appreciated.
 
@@ -15,7 +15,8 @@ Interrupt handler
 -----------------
 
 The interrupt handler is the lowest-level part of the library. It directly
-accesses the peripheral modules and performs keyboard analyzes, swaps screen buffers, etc.
+accesses the peripheral modules and performs keyboard analyzes, swaps screen
+buffers, etc.
 
 gint does not allow user programs to use their own handlers. However, it is
 possible to map interrupt-driven events to user callbacks using the public API
@@ -37,11 +38,15 @@ register access and implements a few standard functions.
 Building and installing
 -----------------------
 
+There a some dependencies:
+* The `sh3eb-elf` toolchain somewhere in the PATH
+* The fxSDK installed and available in the PATH
+
 The easiest way to build gint is simply to enter a terminal and execute `make`.
 This will build the following components :
 * `libgint.a`, the gint library
 * `libc.a`, a (very) few standard procedures
-* `ginttest.g1a`, a test application
+* `gintdemo.g1a`, a test application
 
 The common `clean`, `mrproper`, and `distclean` rules will clean the directory.
 
@@ -50,13 +55,18 @@ The common `clean`, `mrproper`, and `distclean` rules will clean the directory.
 Source organization
 -------------------
 
-gint is made of *modules*. Each module has its own source directory (which is
-`/src/module`), and its associated header file in `/include`. A module folder
-contains three types of files :
-* Internal headers: shared only among the files of a module
-* Single-function source files: to avoid linking against the whole library,
-  some functions have their own object files. Their names are the function
-  names.
-* Other source files: contain multiple functions that always work together, or
-  are lightweight enough not to be separated. Their names often begin with
-  `module_`.
+gint is made of *modules*. Each module may have any of the following
+components:
+* A header file in `/include`
+* An internal header file in `/include/internals`
+* Single-function source files in `/src/module`: to avoid linking against the
+  whole library, some functions have their own object files. Their names are
+  those of the functions.
+* Other source files in `/src/module`: contain multiple functions that always
+  work together, or are lightweight enough not to be separated. Their names
+  often begin with `module_`.
+* Other files in `/src/module`: the `display` module contains a font, I think.
+
+The demo application is in the `demo` directory.
+
+The `doc` folder contains some documentation.
diff --git a/TODO b/TODO
index 9a46c54..e2f2ba8 100644
--- a/TODO
+++ b/TODO
@@ -12,6 +12,7 @@
 @  vram overflow
 @  keyboard test threaded interface
 
++  have timers use structures from 7705.h and 7305.h
 +  full and partial transparency
 +  gint vs. ML with 248x124 at (-60, -28)
 +  call exit handlers
@@ -25,7 +26,6 @@
 +  bitmap parts
 
 -  improve exception handler debugging information (if possible)
--  write and test gray engine
 -  full rtc driver (time)
 -  callbacks and complete user API
 
diff --git a/demo/gintdemo.c b/demo/gintdemo.c
index cfadaae..4f14e51 100644
--- a/demo/gintdemo.c
+++ b/demo/gintdemo.c
@@ -9,79 +9,36 @@
 #include <gray.h>
 
 #include <stdint.h>
+#include <stdarg.h>
 #include <7305.h>
 
+#include <internals/stdio.h>
+
 
 
 //---
-//	A few ugly procedures for displaying text. Will have to enhance this
-//	soon -- which means printf().
+//	A few procedures for displaying text aligned on a 21*8 grid.
+//	Not really beautiful... but this will do.
 //---
 
+void print(int x, int y, const char *format, ...)
+{
+	if(x < 1 || x > 21 || y < 1 || y > 8) return;
+
+	va_list args;
+	va_start(args, format);
+	__printf(0, format, args);
+	va_end(args);
+
+	if(gray_runs()) gtext(__stdio_buffer, x * 6 - 5, y * 8 - 8);
+	else dtext(__stdio_buffer, x * 6 - 5, y * 8 - 8);
+}
+
 void locate(const char *str, int x, int y)
 {
 	if(x < 1 || x > 21 || y < 1 || y > 8) return;
-	if(gray_runs()) gtext(str, x * 6 - 5, y * 8 - 7);
-	else dtext(str, x * 6 - 5, y * 8 - 7);
-}
-
-void locate_hex(unsigned int n, int x, int y)
-{
-	char str[11] = "0x";
-	int i;
-
-	for(i = 0; i < 8; i++)
-	{
-		str[9 - i] = (n & 0xf) + '0' + 39 * ((n & 0xf) > 9);
-		n >>= 4;
-	}
-	str[10] = 0;
-	locate(str, x, y);
-}
-void locate_bin(unsigned char n, int x, int y)
-{
-	char str[9];
-	int i;
-
-	for(i = 0; i < 8;i ++)
-	{
-		str[7 - i] = (n & 1) + '0';
-		n >>= 1;
-	}
-	str[8] = 0;
-	locate(str, x, y);
-}
-void locate_hexa(unsigned int n, int digits, int x, int y)
-{
-	char str[20];
-	int i;
-
-	for(i = digits - 1; i >= 0; i--)
-	{
-		str[i] = (n & 0xf) + '0' + 39 * ((n & 0xf) > 9);
-		n >>= 4;
-	}
-
-	str[digits] = 0;
-	locate(str, x, y);
-}
-void locate_int(int n, int x, int y)
-{
-	char str[20] = { 0 };
-	int i, o = 0;
-	int digits = 0, copy = n;
-
-	if(!n) { str[o++] = '0'; locate(str, x, y); return; }
-	if(n < 0) str[o++] = '-', n = -n;
-	while(copy) digits++, copy /= 10;
-
-	for(i = 0; i < digits; i++)
-	{
-		str[o + digits - i - 1] = n % 10 + '0';
-		n /= 10;
-	}
-
-	locate(str, x, y);
+	if(gray_runs()) gtext(str, x * 6 - 5, y * 8 - 8);
+	else dtext(str, x * 6 - 5, y * 8 - 8);
 }
 
 
@@ -90,6 +47,26 @@ void locate_int(int n, int x, int y)
 //	Test applications.
 //---
 
+/*
+	keyboard_test_binary()
+	Prints a byte as binary/
+*/
+void keyboard_test_binary(int byte, int x, int y)
+{
+	char str[9];
+	int i = 7;
+
+	str[8] = 0;
+	while(i >= 0)
+	{
+		str[i] = '0' + (byte & 1);
+		byte >>= 1;
+		i--;
+	}
+
+	locate(str, x, y);
+}
+
 /*
 	keyboard_test_timer()
 	Displays a keyboard test. The keyboard state is displayed as well, but	
@@ -103,17 +80,17 @@ void keyboard_test_timer(void)
 
 	dclear_area(5, 10, 71, 34);
 
-	locate_bin(state[0], 5, 10);
-	locate_bin(state[1], 5, 16);
-	locate_bin(state[2], 5, 22);
-	locate_bin(state[3], 5, 28);
-	locate_bin(state[4], 5, 34);
+	keyboard_test_binary(state[0], 1, 1);
+	keyboard_test_binary(state[1], 1, 2);
+	keyboard_test_binary(state[2], 1, 3);
+	keyboard_test_binary(state[3], 1, 4);
+	keyboard_test_binary(state[4], 1, 5);
 
-	locate_bin(state[5], 40, 10);
-	locate_bin(state[6], 40, 16);
-	locate_bin(state[7], 40, 22);
-	locate_bin(state[8], 40, 28);
-	locate_bin(state[9], 40, 34);
+	keyboard_test_binary(state[5], 10, 1);
+	keyboard_test_binary(state[6], 10, 2);
+	keyboard_test_binary(state[7], 10, 3);
+	keyboard_test_binary(state[8], 10, 4);
+	keyboard_test_binary(state[9], 10, 5);
 
 	dupdate();
 }
@@ -304,10 +281,10 @@ void gray_test(void)
 			}
 
 			locate("light", 15, 2);
-			locate_int(delays[0], 15, 3);
+			print(15, 3, "%d", delays[0]);
 
 			locate("dark", 15, 5);
-			locate_int(delays[1], 15, 6);
+			print(15, 6, "%d", delays[1]);
 
 			locate("\x02", 14, selected ? 6 : 3);
 
@@ -328,7 +305,7 @@ void gray_test(void)
 			selected = !selected;
 			break;
 		case KEY_F2:
-			delays[0] = 993;
+			delays[0] = isSH3() ? 985 : 994;
 			delays[1] = 1609;
 			break;
 		case KEY_F3:
@@ -356,6 +333,25 @@ void gray_test(void)
 	gray_stop();
 }
 
+/*
+	printf_test()
+	Tests formatting functions.
+*/
+void printf_test(void)
+{
+	dclear();
+	locate("Formatted printing", 1, 1);
+
+	print(2, 3, "%%4.2d   5 :\"%4.2d\"", 5);
+	print(2, 4, "%%-3c   '&':\"%-3c\"", '&');
+	print(2, 5, "%%#05x  27 :\"%#05x\"", 27);
+	print(2, 6, "%%1s   \"tr\":\"%1s\"", "tr");
+	print(2, 7, "%%6p  NULL :\"%7p\"", NULL);
+
+	dupdate();
+	while(getkey() != KEY_EXIT);
+}
+
 /*
 static const unsigned char screen[1024] = {
 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
@@ -537,12 +533,8 @@ void tlb_debug(void)
 	{
 		dclear();
 
-		locate("TLB", 1, 1);
-		locate("way=", 8, 1);
-		locate("0\0001\0002\0003" + (way << 1), 12, 1);
-		locate_int(entry, 16 + (entry < 10), 1);
-		locate("-", 18, 1);
-		locate_int((entry + 2 > 31) ? (31) : (entry + 2) , 19, 1);
+		print(1, 1, "TLB    way=%d   %d-%d", way, entry,
+			entry > 29 ? 31 : entry + 2);
 
 		for(i = 0; i < 3 && entry < 32; i++, entry++)
 		{
@@ -567,14 +559,11 @@ void tlb_debug(void)
 			}
 
 			r = 2 * i + 3;
-			locate_hexa(pointer_base, 8, 1, r);
-			locate(":", 11, r);
-			locate_hexa(ppn << 10, 8, 12, r);
+			print(1, r, "%08x  :%08x", pointer_base, ppn << 10);
 
 			r++;
 			locate((d & 0x08) ? "4k" : "1k", 1, r);
-			locate("pr=", 5, r);
-			locate(protection[(d >> 5) & 3], 8, r);
+			print(5, r, "pr=%s", protection[(d >> 5) & 3]);
 			locate((d & 0x02) ? "shared" : "exclusive", 13, r);
 		}
 
@@ -614,6 +603,7 @@ void main_menu(int *category, int *app)
 		"Image rendering",
 		"Text rendering",
 		"Real-time clock",
+		"Text formatting",
 		NULL
 	};
 	const char *list_perfs[] = {
@@ -626,14 +616,15 @@ void main_menu(int *category, int *app)
 		NULL
 	};
 	const char **list;
+	int list_len;
 
 	extern unsigned int bgint, egint;
 	extern unsigned int romdata;
-	int gint_size = &egint - &bgint;
+	int gint_size = (char *)&egint - (char *)&bgint;
 
 
 
-	static int tab = 0, index = 0;
+	static int tab = 0, index = 0, scroll = 0;
 	// Set to 1 when interface has to be redrawn.
 	int leave = 1;
 	int i;
@@ -654,14 +645,10 @@ void main_menu(int *category, int *app)
 		{
 		case 0:
 			locate("Demo application", 1, 1);
-			locate("gint version:", 2, 3);
-			locate(GINT_VERSION_STR, 16, 3);
-			locate("handler size:", 2, 4);
-			locate_int(gint_size, (gint_size < 1000 ? 18 : 17), 4);
-			locate("mpu type:", 2, 5);
-			locate(mpu, 21 - strlen(mpu), 5);
-			locate("romdata:", 2, 6);
-			locate_hex((unsigned int)&romdata, 11, 6);
+			print(2, 3, "gint version: %5s", GINT_VERSION_STR);
+			print(2, 4, "handler size: %5d", gint_size);
+			print(2, 5, "mpu type:   %7s", mpu);
+			print(2, 6, "romdata:   %08x", &romdata);
 
 			list = NULL;
 			break;
@@ -682,16 +669,24 @@ void main_menu(int *category, int *app)
 			break;
 
 		default:
-			locate("Tab ", 1, 1);
-			locate_int(tab, 5, 1);
+			print(1, 1, "Tab %d", tab);
 			break;
 		}
 		dimage(&res_opt_menu_start, 0, 56);
 
 		if(list)
 		{
-			for(i = 0; list[i]; i++) locate(list[i], 2, i + 2);
-			dreverse_area(0, 8 * index + 9, 127, 8 * index + 16);
+			list_len = 0;
+			while(list[list_len]) list_len++;
+
+			for(i = scroll; list[i] && i < scroll + 6; i++)
+				locate(list[i], 2, i - scroll + 2);
+
+			if(scroll > 0) locate("\x0d", 20, 2);
+			if(scroll + 6 < list_len) locate("\x0e", 20, 7);
+
+			dreverse_area(0, 8 * (index - scroll) + 8, 127,
+				8 * (index - scroll) + 15);
 		}
 		dupdate();
 
@@ -706,27 +701,58 @@ void main_menu(int *category, int *app)
 			switch(getkey())
 			{
 			case KEY_F1:
-				tab = 0;
-				index = 0;
+				tab	= 0;
+				index	= 0;
 				break;
 			case KEY_F2:
-				tab = 1;
-				index = 0;
+				tab	= 1;
+				index	= 0;
+				scroll	= 0;
 				break;
 			case KEY_F3:
-				tab = 2;
-				index = 0;
+				tab	= 2;
+				index	= 0;
+				scroll	= 0;
 				break;
 			case KEY_F4:
-				tab = 3;
-				index = 0;
+				tab	= 3;
+				index	= 0;
+				scroll	= 0;
 				break;
 
 			case KEY_UP:
-				if(list && index) index--;
+				if(list && list_len > 1)
+				{
+					if(index)
+					{
+						index--;
+						if(index < scroll) scroll--;
+					}
+					else
+					{
+						index = list_len - 1;
+						scroll = list_len - 6;
+						if(scroll < 0) scroll = 0;
+					}
+				}
+				else leave = 0;
 				break;
 			case KEY_DOWN:
-				if(list && list[index + 1]) index++;
+				if(list && list_len > 1)
+				{
+					if(list[index + 1])
+					{
+						index++;
+						if(index >= scroll + 6)
+							scroll++;
+					}
+					else
+					{
+						index = 0;
+						scroll = 0;
+					}
+				}
+				else leave = 0;
 				break;
 
 			case KEY_EXE:
@@ -735,7 +761,6 @@ void main_menu(int *category, int *app)
 				if(app) *app = index + 1;
 				return;
 
-			case KEY_EXIT:
 			case KEY_MENU:
 				if(category) *category = 0;
 				if(app) *app = 0;
@@ -783,6 +808,9 @@ int main(void)
 		case 0x0105:
 //			rtc_test();
 			break;
+		case 0x0106:
+			printf_test();
+			break;
 
 		case 0x0301:
 			if(isSH3()) tlb_debug();
diff --git a/doc/bopti.md b/doc/bopti.md
index 5113f56..4cb6b2b 100644
--- a/doc/bopti.md
+++ b/doc/bopti.md
@@ -38,7 +38,8 @@ bitwise instructions, so that performance is maintained.
 
 Consider for instance a logical and operation (`(a, b) -> a & b`).
 Operating on pixels would need to move some data, test the value of a bit in
-the mask, edit the vram data, and eventually shift both the data and the mask, for all of the 32 pixels.
+the mask, edit the vram data, and eventually shift both the data and the mask,
+for all of the 32 pixels.
 One could not expect this from happening in less than 150 processor cycles
 (in comparison, using generic-purpose `setPixel()`-like functions would be at
 least 10 times as long). The smarter method operates directly on the longword
@@ -76,10 +77,9 @@ operations that correspond to the kind of image.
 
 *Detailed article: [Gray engine](gray-engine)*
 
-Gray pixels are made of one four colors, each of which is represented by two
-bits. Arguments `light` and `dark` of gray operation functions are longwords
-containing the least significant and most significant of these bits,
-respectively.
+Gray pixels are made of four colors represented by pairs of bits. Arguments
+`light` and `dark` of gray operation functions are longwords containing the
+least significant and most significant of these bits, respectively.
 
 	white     = 0 [00]
 	lightgray = 1 [01]
@@ -168,7 +168,7 @@ darken(light, dark, x) = (light | (dark & x), (light & x) | (x ^ dark))
 darken2(light, dark, x) = (light | x, (light & x) | dark)
 ~~~
 
-One could easily check that these functions do their jobs when `x  = 1` and
+One could easily check that these functions do their jobs when `x = 1` and
 leave the data unchanged when `x = 0`.
 
 
@@ -183,7 +183,8 @@ Images are made of *layers*, each of which describe the mask for an operation.
 When an image is rendered, *bopti* draws some of those layers in the vram
 using the operation functions.
 
-* Non-transparent monochrome images only have one layer, which describes the mask for the `draw` operation.
+* Non-transparent monochrome images only have one layer, which describes the
+mask for the `draw` operation.
 * Transparent monochrome images have two layers. The first describes the mask
 for the `draw` operation, while the other is the `alpha` operation mask (which
 means that it indicates which pixels are transparent).
@@ -199,7 +200,7 @@ transparent), and the third indicates the color.
 Layers are encoded as a bit map. The image is split into a *grid*, which is
 made of 32-pixel *columns*, and an *end*.
 
-	   32     32     32    e
+	   32     32     32   end
 	+------+------+------+---+
 	|      |      |      |   |
 	|      |      |      |   |
diff --git a/gintdemo.g1a b/gintdemo.g1a
index 7a61a46..10aa989 100644
Binary files a/gintdemo.g1a and b/gintdemo.g1a differ
diff --git a/include/7305.h b/include/7305.h
index 1eb7e71..3288678 100644
--- a/include/7305.h
+++ b/include/7305.h
@@ -5,7 +5,8 @@
 	Double-underscore prefixed structures (e.g. __st_rtc_counter) are used
 	internally but are not meant to be used in user programs.
 
-	Underscore-prefixed names (e.g. _R64CNT) indicate write-only registers.
+	Underscore-prefixed names (e.g. _R64CNT) are used to avoid name
+	conflicts (e.g. STRUCTURE.RTC would expand to STRUCTURE.((T *)0x...)).
 */
 
 #pragma pack(push, 1)
@@ -20,7 +21,6 @@
 struct _st_rtc
 {
 	unsigned char const R64CNT;
-
 	gap(1);
 
 	union {
@@ -31,7 +31,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RSECCNT;
-
 	gap(1);
 
 	union {
@@ -42,7 +41,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RMINCNT;
-
 	gap(1);
 
 	union {
@@ -53,12 +51,10 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RHRCNT;
-
 	gap(1);
 
 	// 0=Sunday, 1=Monday, ..., 6=Saturday, 7=Reserved (prohibited).
 	unsigned char RWKCNT;
-
 	gap(1);
 
 	union {
@@ -69,7 +65,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RDAYCNT;
-
 	gap(1);
 
 	union {
@@ -80,7 +75,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RMONCNT;
-
 	gap(1);
 
 	union {
@@ -101,7 +95,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RSECAR;
-
 	gap(1);
 
 	union {
@@ -112,7 +105,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RMINAR;
-
 	gap(1);
 
 	union {
@@ -124,7 +116,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RHRAR;
-
 	gap(1);
 
 	union {
@@ -136,7 +127,6 @@ struct _st_rtc
 			unsigned DAY		:3;
 		};
 	} RWKAR;
-
 	gap(1);
 
 	union {
@@ -148,7 +138,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RDAYAR;
-
 	gap(1);
 
 	union {
@@ -160,7 +149,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RMONAR;
-
 	gap(1);
 
 	union {
@@ -174,7 +162,6 @@ struct _st_rtc
 			unsigned AF		:1;
 		};
 	} RCR1;
-
 	gap(1);
 
 	union {
@@ -188,7 +175,6 @@ struct _st_rtc
 			unsigned START		:1;
 		};
 	} RCR2;
-
 	gap(1);
 
 	union {
@@ -200,7 +186,6 @@ struct _st_rtc
 			unsigned ONES		:4;
 		};
 	} RYRAR;
-
 	gap(2);
 
 	union {
@@ -357,7 +342,6 @@ struct _st_intx
 			unsigned IrDA		:4;
 		};
 	} IPRA;
-
 	gap(2);
 
 	union {
@@ -369,7 +353,6 @@ struct _st_intx
 			unsigned BEU2_1		:4;
 		};
 	} IPRB;
-
 	gap(2);
 
 	union {
@@ -381,7 +364,6 @@ struct _st_intx
 			unsigned SPU		:4;
 		};
 	} IPRC;
-
 	gap(2);
 
 	union {
@@ -393,7 +375,6 @@ struct _st_intx
 			unsigned ATAPI		:4;
 		};
 	} IPRD;
-
 	gap(2);
 
 	union {
@@ -405,19 +386,17 @@ struct _st_intx
 			unsigned VPU5F		:4;
 		};
 	} IPRE;
-
 	gap(2);
 
 	union {
 		unsigned short WORD;
 		struct {
-			unsigned KEYSC		:4;
+			unsigned _KEYSC		:4;
 			unsigned DMAC0B		:4;
 			unsigned USB01		:4;
 			unsigned CMT		:4;
 		};
 	} IPRF;
-
 	gap(2);
 
 	union {
@@ -429,7 +408,6 @@ struct _st_intx
 			unsigned VEU3F0		:4;
 		};
 	} IPRG;
-
 	gap(2);
 
 	union {
@@ -441,7 +419,6 @@ struct _st_intx
 			unsigned I2C0		:4;
 		};
 	} IPRH;
-
 	gap(2);
 
 	union {
@@ -453,7 +430,6 @@ struct _st_intx
 			unsigned _2DG_ICB	:4;
 		};
 	} IPRI;
-
 	gap(2);
 
 	union {
@@ -465,7 +441,6 @@ struct _st_intx
 			unsigned SDHI1		:4;
 		};
 	} IPRJ;
-
 	gap(2);
 
 	union {
@@ -477,7 +452,6 @@ struct _st_intx
 			unsigned SDHI0		:4;
 		};
 	} IPRK;
-
 	gap(2);
 
 	union {
@@ -489,7 +463,6 @@ struct _st_intx
 			unsigned _2DDMAC	:4;
 		};
 	} IPRL;
-
 	char gap1[82];
 
 	union 
@@ -506,7 +479,6 @@ struct _st_intx
 			unsigned SDHII0		:1;
 		};
 	} IMR0;
-
 	gap(3);
 
 	union 
@@ -523,7 +495,6 @@ struct _st_intx
 			unsigned DEI0		:1;
 		};
 	} IMR1;
-
 	gap(3);
 
 	union 
@@ -538,7 +509,6 @@ struct _st_intx
 			unsigned SCIFA0		:1;
 		};
 	} IMR2;
-
 	gap(3);
 
 	union 
@@ -553,7 +523,6 @@ struct _st_intx
 			unsigned IRDAI		:1;
 		};
 	} IMR3;
-
 	gap(3);
 
 	union 
@@ -569,7 +538,6 @@ struct _st_intx
 			unsigned LCDCI		:1;
 		};
 	} IMR4;
-
 	gap(3);
 
 	union 
@@ -586,7 +554,6 @@ struct _st_intx
 			unsigned SCIF0		:1;
 		};
 	} IMR5;
-
 	gap(3);
 
 	union 
@@ -602,7 +569,6 @@ struct _st_intx
 			unsigned MSIOFI1	:1;
 		};
 	} IMR6;
-
 	gap(3);
 
 	union 
@@ -619,7 +585,6 @@ struct _st_intx
 			unsigned AL1I		:1;
 		};
 	} IMR7;
-
 	gap(3);
 
 	union 
@@ -635,7 +600,6 @@ struct _st_intx
 			unsigned FSI		:1;
 		};
 	} IMR8;
-
 	gap(3);
 
 	union 
@@ -650,7 +614,6 @@ struct _st_intx
 			unsigned 		:1;
 		};
 	} IMR9;
-
 	gap(3);
 
 	union 
@@ -667,7 +630,6 @@ struct _st_intx
 			unsigned CUI		:1;
 		};
 	} IMR10;
-
 	gap(3);
 
 	union 
@@ -684,7 +646,6 @@ struct _st_intx
 			unsigned TSIFI		:1;
 		};
 	} IMR11;
-
 	gap(3);
 
 	union 
@@ -695,7 +656,6 @@ struct _st_intx
 			unsigned _2DDMAC	:1;
 		};
 	} IMR12;
-
 	char gap2[15];
 
 	union 
@@ -712,7 +672,6 @@ struct _st_intx
 			unsigned SDHII0		:1;
 		};
 	} _IMCR0;
-
 	gap(3);
 
 	union 
@@ -729,7 +688,6 @@ struct _st_intx
 			unsigned DEI0		:1;
 		};
 	} _IMCR1;
-
 	gap(3);
 
 	union 
@@ -744,7 +702,6 @@ struct _st_intx
 			unsigned SCIFA0		:1;
 		};
 	} _IMCR2;
-
 	gap(3);
 
 	union 
@@ -759,7 +716,6 @@ struct _st_intx
 			unsigned IRDAI		:1;
 		};
 	} _IMCR3;
-
 	gap(3);
 
 	union 
@@ -775,7 +731,6 @@ struct _st_intx
 			unsigned LCDCI		:1;
 		};
 	} _IMCR4;
-
 	gap(3);
 
 	union 
@@ -792,7 +747,6 @@ struct _st_intx
 			unsigned SCIF0		:1;
 		};
 	} _IMCR5;
-
 	gap(3);
 
 	union 
@@ -808,7 +762,6 @@ struct _st_intx
 			unsigned MSIOFI1	:1;
 		};
 	} _IMCR6;
-
 	gap(3);
 
 	union 
@@ -825,7 +778,6 @@ struct _st_intx
 			unsigned AL1I		:1;
 		};
 	} _IMCR7;
-
 	gap(3);
 
 	union 
@@ -841,7 +793,6 @@ struct _st_intx
 			unsigned FSI		:1;
 		};
 	} _IMCR8;
-
 	gap(3);
 
 	union 
@@ -856,7 +807,6 @@ struct _st_intx
 			unsigned 		:1;
 		};
 	} _IMCR9;
-
 	gap(3);
 
 	union 
@@ -873,7 +823,6 @@ struct _st_intx
 			unsigned CUI		:1;
 		};
 	} _IMCR10;
-
 	gap(3);
 
 	union 
@@ -890,7 +839,6 @@ struct _st_intx
 			unsigned TSIFI		:1;
 		};
 	} _IMCR11;
-
 	gap(3);
 
 	union 
diff --git a/include/alloca.h b/include/alloca.h
index 9cf0899..37c88e7 100644
--- a/include/alloca.h
+++ b/include/alloca.h
@@ -1,6 +1,6 @@
 //---
 //
-//	gint core module: alloca
+//	standard library module: alloca
 //
 //	Allows dynamic memory allocation on the stack. Memory is automatically
 //	freed when the calling function exits.
diff --git a/include/ctype.h b/include/ctype.h
index 8c5bbd5..8c7ee2d 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -1,3 +1,11 @@
+//---
+//
+//	standard library module: ctype
+//
+//	Some character manipulation.
+//
+//---
+
 #ifndef	_CTYPE_H
 #define	_CTYPE_H 1
 
diff --git a/include/display.h b/include/display.h
index 4cca184..2b53a14 100644
--- a/include/display.h
+++ b/include/display.h
@@ -14,8 +14,7 @@
 //	Heading declarations.
 //---
 
-#include <stdint.h>
-#include <tales.h>
+#include <internals/tales.h>
 
 enum Color
 {
@@ -149,47 +148,4 @@ void dline(int x1, int y1, int x2, int y2, enum Color color);
 */
 void dimage(struct Image *image, int x, int y);
 
-
-
-//---
-//	Rectangle masks.
-//
-//	The concept of 'rectangle masks' is used several times in this module.
-//	It is based on the fact that an operation that affects a rectangle acts
-//	the same on all its lines. Therefore the behavior of the operation is
-//	determined by its behavior on a single line, which is represented using
-//	'masks' whose bits indicate whether a pixel is affected (1) or not (0).
-//
-//	For example when clearing the screen rectangle (16, 16, 112, 48), the
-//	masks will represent information '16 to 112 on x-axis', and will hold
-//	the following values : 0000ffff, ffffffff, ffffffff and ffff0000. These
-//	masks can then be used by setting vram[offset] &= ~masks[i]. This
-//	appears to be very flexible : for instance, vram[offset] ^= masks[i]
-//	will reverse the pixels in the same rectangle.
-//
-//	This technique can also be used in more subtle cases with more complex
-//	patterns, but within this module it is unlikely to happen.
-//
-//---
-
-/*
-	adjustRectangle()
-	Adjusts the given rectangle coordinates to ensure that :
-	- the rectangle is entirely contained in the screen
-	- x1 < x2
-	- y1 < y2
-	which is needed when working with screen rectangles.
-*/
-void adjustRectangle(int *x1, int *y1, int *x2, int *y2);
-
-/*
-	getMasks()
-	Computes the rectangle masks needed to affect pixels located between x1
-	and x2 (both included). The four masks are stored in the third argument
-	(seen as an array).
-*/
-void getMasks(int x1, int x2, uint32_t *masks);
-
-
-
 #endif	// _DISPLAY_H
diff --git a/include/gint.h b/include/gint.h
index 879d576..8e7fa35 100644
--- a/include/gint.h
+++ b/include/gint.h
@@ -32,6 +32,45 @@ unsigned int gint_systemVBR(void);
 
 
 
+//---
+//	Register access.
+//---
+
+/*
+	enum Register
+	Represents common registers. Used as identifiers to retrieve their
+	values using gint_register().
+*/
+enum Register
+{
+	Register_EXPEVT,
+	Register_MMUCR,
+	Register_TEA,
+};
+
+/*
+	gint_register()
+	Returns the address of a common register. All common registers exist
+	on both platforms but they may hold different values for the same
+	information (f.i. EXPEVT may not return the same value for a given
+	exception on both 7705 and 7305).
+*/
+volatile void *gint_reg(enum Register reg);
+
+/*
+	gint_strerror()
+	Returns a string that describe the error set in EXPEVT in case of
+	general exception of TLB miss exception. This string is platform-
+	independent.
+	Some exception codes represent different errors when invoked inside the
+	general exception handler and the TLB error handler. Parameter 'is_tlb'
+	should be set to zero for general exception meanings, and anything non-
+	zero for TLB error meanings.
+*/
+const char *gint_strerror(int is_tlb);
+
+
+
 //---
 //	Internal API.
 //	Referenced here for documentation purposes only.
@@ -75,6 +114,15 @@ void gint_setup_7305(void);
 void gint_stop_7705(void);
 void gint_stop_7305(void);
 
+/*
+	gint_reg()
+	gint_strerror()
+	See "Register access" section.
+*/
+volatile void *gint_reg_7705(enum Register reg);
+volatile void *gint_reg_7305(enum Register reg);
+const char *gint_strerror_7705(int is_tlb);
+const char *gint_strerror_7305(int is_tlb);
 
 
 //---
@@ -110,49 +158,6 @@ void gint_int_7305(void)	__attribute__((section(".gint.int")));
 
 
 
-//---
-//	Register access.
-//---
-
-/*
-	enum Register
-	Represents common registers. Used as identifiers to retrieve their
-	values using gint_register().
-*/
-enum Register
-{
-	Register_EXPEVT,
-	Register_MMUCR,
-	Register_TEA,
-};
-
-/*
-	gint_register()
-	Returns the address of a common register. All common registers exist
-	on both platforms but they may hold different values for the same
-	information (f.i. EXPEVT may not return the same value for a given
-	exception on both 7705 and 7305).
-*/
-volatile void *gint_reg(enum Register reg);
-volatile void *gint_reg_7705(enum Register reg);
-volatile void *gint_reg_7305(enum Register reg);
-
-/*
-	gint_strerror()
-	Returns a string that describe the error set in EXPEVT in case of
-	general exception of TLB miss exception. This string is platform-
-	independent.
-	Some exception codes represent different errors when invoked inside the
-	general exception handler and the TLB error handler. Parameter 'is_tlb'
-	should be set to zero for general exception meanings, and anything non-
-	zero for TLB error meanings.
-*/
-const char *gint_strerror(int is_tlb);
-const char *gint_strerror_7705(int is_tlb);
-const char *gint_strerror_7305(int is_tlb);
-
-
-
 //---
 //	Internal platform-independent definitions.
 //---
diff --git a/include/internals/bopti.h b/include/internals/bopti.h
index 3e0116c..3ed11cb 100644
--- a/include/internals/bopti.h
+++ b/include/internals/bopti.h
@@ -86,7 +86,7 @@ struct Command
 // The video ram addresses are set by the public functions and used internally
 // by the module.
 // Monochrome video ram, light and dark buffers (in this order).
-extern int *vram, *v1, *v2;
+extern int *bopti_vram, *bopti_v1, *bopti_v2;
 
 
 
diff --git a/include/internals/display.h b/include/internals/display.h
index a227edd..ac8d4bd 100644
--- a/include/internals/display.h
+++ b/include/internals/display.h
@@ -9,6 +9,47 @@
 #ifndef	_INTERNALS_DISPLAY_H
 #define	_INTERNALS_DISPLAY_H	1
 
+#include <stdint.h>
+
 extern int *vram;
 
+//---
+//	Rectangle masks.
+//
+//	The concept of 'rectangle masks' is used several times in this module.
+//	It is based on the fact that an operation that affects a rectangle acts
+//	the same on all its lines. Therefore the behavior of the operation is
+//	determined by its behavior on a single line, which is represented using
+//	'masks' whose bits indicate whether a pixel is affected (1) or not (0).
+//
+//	For example when clearing the screen rectangle (16, 16, 112, 48), the
+//	masks will represent information '16 to 112 on x-axis', and will hold
+//	the following values : 0000ffff, ffffffff, ffffffff and ffff0000. These
+//	masks can then be used by setting vram[offset] &= ~masks[i]. This
+//	appears to be very flexible : for instance, vram[offset] ^= masks[i]
+//	will reverse the pixels in the same rectangle.
+//
+//	This technique can also be used in more subtle cases with more complex
+//	patterns, but within this module it is unlikely to happen.
+//
+//---
+
+/*
+	adjustRectangle()
+	Adjusts the given rectangle coordinates to ensure that :
+	- the rectangle is entirely contained in the screen
+	- x1 < x2
+	- y1 < y2
+	which is needed when working with screen rectangles.
+*/
+void adjustRectangle(int *x1, int *y1, int *x2, int *y2);
+
+/*
+	getMasks()
+	Computes the rectangle masks needed to affect pixels located between x1
+	and x2 (both included). The four masks are stored in the third argument
+	(seen as an array).
+*/
+void getMasks(int x1, int x2, uint32_t *masks);
+
 #endif	// _INTERNALS_DISPLAY_H
diff --git a/include/internals/stdio.h b/include/internals/stdio.h
new file mode 100644
index 0000000..bf68b81
--- /dev/null
+++ b/include/internals/stdio.h
@@ -0,0 +1,32 @@
+//---
+//
+//	standard library module: stdio
+//
+//	Handles most input/output for the program. This module does not
+//	interact with the file system directly.
+//
+//---
+
+#ifndef	_INTERNALS_STDIO_H
+#define	_INTERNALS_STDIO_H	1
+
+#include <stddef.h>
+#include <stdarg.h>
+
+//---
+//	Formatted printing.
+//---
+
+#ifndef		__stdio_buffer_size
+#define		__stdio_buffer_size 256
+#endif
+
+extern char	__stdio_buffer[];
+
+/*
+	__printf()
+	Formatted printing to the stdio buffer.
+*/
+int __printf(size_t size, const char *format, va_list args);
+
+#endif	// _INTERNALS_STDIO_H
diff --git a/include/setjmp.h b/include/setjmp.h
index 0addccf..54dceea 100644
--- a/include/setjmp.h
+++ b/include/setjmp.h
@@ -1,3 +1,12 @@
+//---
+//
+//	gint standard module: setjmp
+//
+//	Long jumps. The register contents are saved in a buffer when setjmp()
+//	is called and restored at any time when longjmp() performs the jump.
+//
+//---
+
 #ifndef	_SETJMP_H
 #define	_SETJMP_H	1
 
@@ -12,13 +21,13 @@ typedef	unsigned int jmp_buf[16];
 //---
 
 /*
-	setjmp()
+	setjmp()	O(1)
 	Configures a jump by saving data to the given jump buffer.
 */
 int setjmp(jmp_buf env);
 
 /*
-	longjmp()
+	longjmp()	O(1)
 	Performs a long jump.
 */
 void longjmp(jmp_buf env, int value);
diff --git a/include/stdio.h b/include/stdio.h
new file mode 100644
index 0000000..f19ecdb
--- /dev/null
+++ b/include/stdio.h
@@ -0,0 +1,44 @@
+//---
+//
+//	standard library module: stdio
+//
+//	Handles most input/output for the program. This module does not
+//	interact with the file system directly.
+//
+//---
+
+#ifndef	_STDIO_H
+#define	_STDIO_H	1
+
+#include <stddef.h>
+#include <stdarg.h>
+
+//---
+//	Formatted printing.
+//---
+
+/*
+	sprintf()
+	Prints to a string.
+*/
+int sprintf(char *str, const char *format, ...);
+
+/*
+	snprintf()
+	Prints to a string with a size limit.
+*/
+int snprintf(char *str, size_t size, const char *format, ...);
+
+/*
+	vsprintf()
+	Prints to a string from an argument list.
+*/
+int vsprintf(char *str, const char *format, va_list args);
+
+/*
+	vsnprintf()
+	The most generic formatted printing function around there.
+*/
+int vsnprintf(char *str, size_t size, const char *format, va_list args);
+
+#endif	// _STDIO_H
diff --git a/include/stdlib.h b/include/stdlib.h
index 0a0ff01..0eb5591 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -1,3 +1,12 @@
+//---
+//
+//	standard library module: stdlib
+//
+//	Provides standard functionalities such as dynamic allocation,
+//	string/numeric conversion, and abort calls.
+//
+//---
+
 #ifndef	_STDLIB_H
 #define	_STDLIB_H	1
 
diff --git a/include/string.h b/include/string.h
index e746347..dc0ac1c 100644
--- a/include/string.h
+++ b/include/string.h
@@ -1,3 +1,12 @@
+//---
+//
+//	standard library module: string
+//
+//	String manipulation using NUL-terminated byte arrays, without extended
+//	characters.
+//
+//---
+
 #ifndef	_STRING_H
 #define	_STRING_H	1
 
@@ -28,9 +37,27 @@ void *memset(void *destination, int byte, size_t byte_number);
 //---
 
 /*
-	strlen()	O(length)
+	strlen()	O(len(str))
 	Returns the length of a string.
 */
 size_t strlen(const char *str);
 
+/*
+	strcpy()	O(len(source))
+	Copies a string to another.
+*/
+char *strcpy(char *destination, const char *source);
+
+/*
+	strchr()	O(len(str))
+	Searches a character in a string.
+*/
+const char *strchr(const char *str, int value);
+
+/*
+	strncpy()	O(min(len(source), size))
+	Copies part of a string to another.
+*/
+char *strncpy(char *destination, const char *source, size_t size);
+
 #endif	// _STRING_H
diff --git a/include/tales.h b/include/tales.h
index bb990b9..5d5c25f 100644
--- a/include/tales.h
+++ b/include/tales.h
@@ -2,8 +2,8 @@
 //
 //	gint drawing module: tales
 //
-//	Text displaying. Does some good optimization, though requires dynamic
-//	allocation.
+//	Text displaying. Does some pretty good optimization, though requires
+//	dynamic allocation. The stack is used.
 //
 //---
 
@@ -113,4 +113,16 @@ void dtext(const char *str, int x, int y);
 */
 void gtext(const char *str, int x, int y);
 
+/*
+	dprint()
+	Prints a formatted string. Works the same as printf().
+*/
+void dprint(int x, int y, const char *format, ...);
+
+/*
+	gprint()
+	Prints a formatted string. Works the same as printf().
+*/
+void gprint(int x, int y, const char *format, ...);
+
 #endif	// _TALES_H
diff --git a/libc.a b/libc.a
index 6bdac15..ddbff9e 100644
Binary files a/libc.a and b/libc.a differ
diff --git a/libgint.a b/libgint.a
index 072c42e..895e9b7 100644
Binary files a/libgint.a and b/libgint.a differ
diff --git a/src/bopti/bopti_internals.c b/src/bopti/bopti_internals.c
index 60caec1..bb48bdb 100644
--- a/src/bopti/bopti_internals.c
+++ b/src/bopti/bopti_internals.c
@@ -1,7 +1,7 @@
 #include <internals/bopti.h>
 
 // Monochrome video ram, light and dark buffers (in this order).
-int *vram, *v1, *v2;
+int *bopti_vram, *bopti_v1, *bopti_v2;
 
 /*
 	bopti_op()
@@ -19,11 +19,11 @@ void bopti_op_mono(int offset, uint32_t operator, struct Command *c)
 	switch(c->channel)
 	{
 	case Channel_Mono:
-		vram[offset] |= operator;
+		bopti_vram[offset] |= operator;
 		break;
 
 	case Channel_FullAlpha:
-		vram[offset] &= ~operator;
+		bopti_vram[offset] &= ~operator;
 		break;
 
 	default:
@@ -37,21 +37,21 @@ void bopti_op_gray(int offset, uint32_t operator, struct Command *c)
 	switch(c->channel)
 	{
 	case Channel_Mono:
-		v1[offset] |= operator;
-		v2[offset] |= operator;
+		bopti_v1[offset] |= operator;
+		bopti_v2[offset] |= operator;
 		break;
 
 	case Channel_Light:
-		v1[offset] |= operator;
+		bopti_v1[offset] |= operator;
 		break;
 
 	case Channel_Dark:
-		v2[offset] |= operator;
+		bopti_v2[offset] |= operator;
 		break;
 
 	case Channel_FullAlpha:
-		v1[offset] &= ~operator;
-		v2[offset] &= ~operator;
+		bopti_v1[offset] &= ~operator;
+		bopti_v2[offset] &= ~operator;
 		break;
 
 	case Channel_LightAlpha:
diff --git a/src/bopti/dimage.c b/src/bopti/dimage.c
index 8c2f5f9..d4d300f 100644
--- a/src/bopti/dimage.c
+++ b/src/bopti/dimage.c
@@ -1,5 +1,5 @@
 #include <internals/bopti.h>
-#include <display.h>
+#include <internals/display.h>
 
 /*
 	dimage()
@@ -34,7 +34,7 @@ void dimage(struct Image *img, int x, int y)
 	if(x >= 0) getMasks(x, x + actual_width - 1, command.masks);
 	else getMasks(0, actual_width + x - 1, command.masks);
 
-	vram = display_getCurrentVRAM();
+	bopti_vram = display_getCurrentVRAM();
 
 	while(format)
 	{
diff --git a/src/bopti/gimage.c b/src/bopti/gimage.c
index 65e0ed3..27df32b 100644
--- a/src/bopti/gimage.c
+++ b/src/bopti/gimage.c
@@ -1,5 +1,5 @@
 #include <internals/bopti.h>
-#include <display.h>
+#include <internals/display.h>
 #include <gray.h>
 
 /*
@@ -34,8 +34,8 @@ void gimage(struct Image *img, int x, int y)
 	if(x >= 0) getMasks(x, x + actual_width - 1, command.masks);
 	else getMasks(0, actual_width + x - 1, command.masks);
 
-	v1 = gray_lightVRAM();
-	v2 = gray_darkVRAM();
+	bopti_v1 = gray_lightVRAM();
+	bopti_v2 = gray_darkVRAM();
 
 	while(format)
 	{
diff --git a/src/display/font_system.bmp b/src/display/font_system.bmp
index e866558..0f49d5b 100644
Binary files a/src/display/font_system.bmp and b/src/display/font_system.bmp differ
diff --git a/src/gray/gray_engine.c b/src/gray/gray_engine.c
index de4f0e4..7938891 100644
--- a/src/gray/gray_engine.c
+++ b/src/gray/gray_engine.c
@@ -9,6 +9,7 @@
 #include <gray.h>
 #include <screen.h>
 #include <timer.h>
+#include <mpu.h>
 
 static int internal_vrams[3][256];
 static const void *vrams[4];
@@ -151,6 +152,6 @@ void gray_init(void)
 	vrams[2] = (const void *)internal_vrams[1];
 	vrams[3] = (const void *)internal_vrams[2];
 
-	delays[0] = 993;
+	delays[0] = isSH3() ? 985 : 994;
 	delays[1] = 1609;
 }
diff --git a/src/rtc/rtc_interrupt.c b/src/rtc/rtc_interrupt.c
index a606a45..96e66a3 100644
--- a/src/rtc/rtc_interrupt.c
+++ b/src/rtc/rtc_interrupt.c
@@ -14,7 +14,7 @@ static void (*rtc_callback)(void) = NULL;
 	Sets the callback function for the real-time clock interrupt. If
 	frequency is non-NULL, the clock frequency is set to the given value.
 */
-void gint_setRTCCallback(void (*callback)(void), enum RTCFrequency frequency)
+void rtc_setCallback(void (*callback)(void), enum RTCFrequency frequency)
 {
 	rtc_callback = callback;
 	if(frequency < 1 || frequency > 7) return;
@@ -30,7 +30,7 @@ void gint_setRTCCallback(void (*callback)(void), enum RTCFrequency frequency)
 	Returns the callback function. If frequency is non-NULL, it is set to
 	the current frequency value.
 */
-void (*gint_getRTCCallback(enum RTCFrequency *frequency))(void)
+void (*rtc_getCallback(enum RTCFrequency *frequency))(void)
 {
 	if(!frequency) return rtc_callback;
 
diff --git a/src/setjmp/setjmp.s b/src/setjmp/setjmp.s
index 81a053a..3b6f910 100644
--- a/src/setjmp/setjmp.s
+++ b/src/setjmp/setjmp.s
@@ -1,5 +1,5 @@
 /*
-	gint standard module: setjmp
+	standard library module: setjmp
 
 	Long jumps. The register contents are saved in a buffer when setjmp()
 	is called and restored at any time when longjmp() performs the jump.
diff --git a/src/stdio/snprintf.c b/src/stdio/snprintf.c
new file mode 100644
index 0000000..eed74db
--- /dev/null
+++ b/src/stdio/snprintf.c
@@ -0,0 +1,19 @@
+#include <internals/stdio.h>
+#include <stdio.h>
+#include <string.h>
+
+/*
+	snprintf()
+	Prints to a string with a size limit.
+*/
+int snprintf(char *str, size_t size, const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+
+	int x = __printf(size, format, args);
+	strncpy(str, __stdio_buffer, size);
+
+	va_end(args);
+	return x;
+}
diff --git a/src/stdio/sprintf.c b/src/stdio/sprintf.c
new file mode 100644
index 0000000..a283635
--- /dev/null
+++ b/src/stdio/sprintf.c
@@ -0,0 +1,19 @@
+#include <internals/stdio.h>
+#include <stdio.h>
+#include <string.h>
+
+/*
+	sprintf()
+	Prints to a string.
+*/
+int sprintf(char *str, const char *format, ...)
+{
+	va_list args;
+	va_start(args, format);
+
+	int x = __printf(0, format, args);
+	strncpy(str, __stdio_buffer, __stdio_buffer_size);
+
+	va_end(args);
+	return x;
+}
diff --git a/src/stdio/stdio_format.c b/src/stdio/stdio_format.c
new file mode 100644
index 0000000..392ddc7
--- /dev/null
+++ b/src/stdio/stdio_format.c
@@ -0,0 +1,912 @@
+#include <internals/stdio.h>
+#include <stdio.h>
+
+#include <string.h>
+#include <stdarg.h>
+#include <ctype.h>
+
+/*
+	Internal buffer.
+
+	Using a buffer *really* simplifies everything. But it also has
+	disadvantages, such a memory loss and limited output size.
+
+	So, in case we find a possibility to get rid of this buffer, we will
+	just have to change function character(), which is for now the only
+	function that directly accesses the buffer.
+*/
+char __stdio_buffer[__stdio_buffer_size];
+
+
+
+/*
+	Format composed types.
+
+	Format structure handles everything in a format, from data type to
+	given value, including alternative forms, alignment and digit numbers.
+
+	A format is made of a data type, which can be altered by a size option,
+	a number of integer and decimal digits, and additional flags.
+
+	The FormatFlags enumeration handles the various flags that can be added
+	to a printf()-family format.
+*/
+
+enum FormatFlags
+{
+	// Option '#' specifies alternatives forms, mainly '0' and '0x'
+	// prefixes in integer display.
+	Alternative	= 1,
+	// Under specific conditions, zero-padding may be used instead of
+	// whitespace-padding.
+	ZeroPadded	= 2,
+	// Left alignment specifies that additional spaces should be added
+	// after the value.
+	LeftAlign	= 4,
+	// In numeric display, this forces a blank sign to be written before
+	// positive values.
+	BlankSign	= 8,
+	// In numeric display, this forces an explicit sign in all cases. This
+	// option overrides BlankSign (see __printf() description for further
+	// information on option precedence and influence).
+	ForceSign	= 16
+};
+
+struct Format
+{
+	// Format type, one of 'diouxXcs' ('eEfFgGaApnm' still to add).
+	char type;
+	// Format size, one of 'l', 'h', 'i' ('i' means 'hh').
+	char size;
+
+	// Number of characters printed.
+	int characters;
+	// Number of digits after the dot.
+	int precision;
+
+	// Various flags.
+	enum FormatFlags flags;
+
+	// Value to output.
+	union	
+	{
+		// Signed int with formats %c, %d and %i.
+		signed int _int;
+		// Insigned int with formats %o, %u, %x and %X.
+		unsigned int _unsigned;
+		// Double with formats %f, %F, %e, %E, %g and %G.
+//		double _double;
+		// String pointer with format %s.
+		const char *_pointer;
+	};
+};
+
+
+
+//---
+//	Static declarations.
+//---
+
+// Outputs a character in the buffer. Updates counters.
+static void character(int c);
+// Outputs n timers the given character.
+static void character_n(int c, int n);
+// Reads a format from the given string pointer address (must begin with '%').
+static struct Format get_format(const char **pointer);
+// Computes the number of spaces and zeros to add to the bare output.
+static void get_spacing(struct Format format, int *begin_spaces, int *sign,
+	int *zeros, int length, int *end_spaces);
+
+static void format_di	(struct Format format);
+static void format_u	(struct Format format);
+static void format_oxX	(struct Format format);
+// static void format_e	(struct Format format);
+static void format_c	(struct Format format);
+static void format_s	(struct Format format);
+static void format_p	(struct Format format);
+
+#define abs(x) ((x) < 0 ? -(x) : (x))
+
+// Number of characters currently written.
+static size_t written = 0;
+// Total number of function calls (characters theoretically written).
+static size_t total = 0;
+// Maximum number of characters to output.
+static size_t max = 0;
+
+
+
+/*
+	character()
+	Outputs a character to the buffer. This function centralizes all the
+	buffer interface, so that if we come to remove it for property reasons,
+	we would just have to edit this function.
+
+	Static variables written and total are both needed, because the
+	terminating NUL character may be written after the maximum has been
+	reached.
+	In other words, when the function ends, we need to have a variable
+	counting the current position in the buffer (written), and one other
+	containing the total number of theoretic characters (total) because
+	these two values may be different.
+
+	Of course the three variables need to be initialized before using this
+	function.
+*/
+static void character(int c)
+{
+	// If there is space left in the buffer.
+	if(written < max - 1) __stdio_buffer[written++] = c;
+	total++;
+}
+
+/*
+	character_n()
+	Outputs n times the same character. Thought to be used to output spaces
+	or zeros without heavy loops.
+*/
+static void character_n(int c, int n)
+{
+	int i = 0;
+	while(i++ < n) character(c);
+}
+
+/*
+	get_format()
+	Reads the format from the given string pointer and returns a
+	corresponding Format structure. The string pointer points to is also
+	modified, so that is points to the first character after the format.
+	This function expects **pointer == '%'.
+*/
+static struct Format get_format(const char **pointer)
+{
+	const char *convspec = "diouxXeEfFgGaAcspnm";
+	struct Format format;
+
+	const char *string = *pointer, *ptr;
+	int c, i;
+	char precision[10];
+
+	// Moving the string pointer after the '%' character.
+	string++;
+
+	// Initializing structure.
+	format.type	= 0;
+	format.size	= 0;
+	format.flags	= 0;
+	// Initializing digit counts.
+	format.characters = -1;
+	format.precision = -1;
+
+	// Parsing the format string. Testing each character until a
+	// conversion specifier is found.
+	while((c = *string))
+	{
+		// Looking for a conversion specifier.
+		ptr = strchr(convspec, c);
+		if(ptr)
+		{
+			format.type = *ptr;
+			break;
+		}
+
+		// Looking for a left precision string (number of digits before
+		// the dot), introduced by a non-null digit.
+		if(c >= '1' && c <= '9')
+		{
+			format.characters = 0;
+			for(i = 0; i < 9 && isdigit(*string); string++)
+			{
+				format.characters *= 10;
+				format.characters += *string - '0';
+			}
+
+			// As pointer is now pointing to the next character,
+			// we want to try tests again from the beginning.
+			continue;
+		}
+
+		// Looking for a right precision string (number of digits after
+		// the dot), introduced by a point.
+		if(c == '.')
+		{
+			string++;
+			if(!isdigit(*string)) continue;
+
+			format.precision = 0;
+			for(i = 0; i < 9 && isdigit(*string); string++)
+			{
+				format.precision *= 10;
+				format.precision += *string - '0';
+			}
+
+			// As pointer is now pointing on the next character,
+			// we want to try tests again from the beginning.
+			continue;
+		}
+
+		// Handling predefined characters.
+		switch(*string)
+		{
+		// Length modifiers.
+		case 'h':
+			format.size = 'h' + (format.size == 'h');
+			break;
+		case 'l':
+		case 'L':
+		case 'z':
+		case 't':
+			format.size = *string;
+			break;
+
+		// Flags.
+		case '#':
+			format.flags |= Alternative;
+			break;
+		case '0':
+			format.flags |= ZeroPadded;
+			break;
+		case '-':
+			format.flags |= LeftAlign;
+			break;
+		case ' ':
+			format.flags |= BlankSign;
+			break;
+		case '+':
+			format.flags |= ForceSign;
+			break;
+		}
+
+		string++;
+	}
+
+	// If the format hasn't ended, the type attribute is left to zero and
+	// the main loop will handle failure and break. Nothing has to be done
+	// here.
+
+	*pointer = string + 1;
+	return format;
+}
+
+/*
+	get_spacing()
+	Computes the arrangement of beginning spaces, sign, zeros, pure value
+	and ending spaces in formats.
+	This formatting follows a recurrent model which is centralized in this
+	function. Note that you can't have `begin_spaces` and `end_spaces`
+	both non-zero: at least one is null.
+*/
+static void get_spacing(struct Format format, int *begin_spaces, int *sign,
+	int *zeros, int length, int *end_spaces)
+{
+	// Using a list of types involving a sign.
+	const char *signed_types = "dieEfFgGaA";
+	int spaces;
+	// Digits represents pure output + zeros (don't mix up with the *real*
+	// displayed digits).
+	int digits;
+	int left = format.flags & LeftAlign;
+
+	// Getting the total number of digits.
+	switch(format.type)
+	{
+	// In integer display, the number of digits output is specified in the
+	// precision.
+	case 'd':
+	case 'i':
+	case 'u':
+		digits = format.precision;
+		if(digits < length) digits = length;
+		break;
+
+	// Binary display has prefixes such as '0' and '0x'.
+	case 'o':
+	case 'x':
+	case 'X':
+		digits = format.precision;
+		if(digits == -1) digits = length;
+
+		if(format.flags & Alternative)
+		{
+			int hexa = (format.type == 'x' || format.type == 'X');
+			digits += 1 + hexa;
+			length += 1 + hexa;
+		}
+		if(digits < length) digits = length;
+		break;
+
+	// Other formats do not have additional zeros.
+	default:
+		digits = length;
+		break;
+	}
+
+	if(sign)
+	{
+		if(strchr(signed_types, format.type))
+		{
+			if(format.flags & BlankSign) *sign = ' ';
+			// Option '+' overrides option ' '.
+			if(format.flags & ForceSign) *sign = '+';
+			// And of course negative sign overrides everything!
+			if(format.type == 'd' || format.type == 'i')
+			{
+				if(format._int < 0) *sign = '-';
+			}
+//			else if(format._double < 0) *sign = '-';
+
+		}
+		else *sign = 0;
+	}
+
+	// Computing the number of spaces.
+	spaces = format.characters - digits;
+	// Computing the number of zeros.
+	*zeros = digits - length;
+
+	// Removing a space when a sign appears.
+	if(sign && *sign) spaces--;
+
+	// Option '0' translates spaces to zeros, but only if no precision is
+	// specified; additionally, left alignment overrides zero-padding.
+	if(!left && format.precision == -1 && format.flags & ZeroPadded)
+	{
+		*zeros += spaces;
+		spaces = 0;
+	}
+
+	// Setting the correct spaces number to the computed value, depending
+	// on the left alignment parameter.
+	*begin_spaces	= left ? 0 : spaces;
+	*end_spaces	= left ? spaces : 0;
+}
+
+/*
+	__printf()
+
+	Basic buffered formatted printing function. Fully-featured, so that
+	ant call to a printf()-family function can be translated into a
+	__printf() call.
+
+	It always returns the number of characters of the theoretic formatted
+	output. The real output may be limited in size by the given size
+	argument when working with nprintf()-family functions, or the internal
+	buffer itself.
+
+	The Flags structure isn't necessary, but it simplifies a lot format
+	argument handling (because flag effects depend on format type, which
+	is unknown when the flags are read). Also, length modifiers 'hh' is
+	stored as 'i' to simplify structure handling. 'll' is not supported.
+	Format '%LF' is allowed by C99 and therefore supported.
+
+	Generic information on options precedence and influence.
+	-	Influences of integer part and mantissa digit numbers depend on
+		the type of data that is being displayed.
+	-	Option '#' doesn't contend with any other.
+	-	Option '+' overrides options ' '.
+	-	In integer display, option '0' translates spaces to zeros, but
+		only if no decimal digit number is specified.
+		The option '-' also overrides it, forcing whitespaces to be
+		written at the end of the format.
+
+	Limit of function.
+	-	Internal buffer size (should be customizable with a -D option
+		when compiling).
+	-	Precision values (format %a.b) are written on 8 bits, therefore
+		limited to 127.
+
+	Unsupported features.
+	-	Flag character ''' (single quote) for thousands grouping
+	-	Flag character 'I', that outputs locale's digits (glibc 2.2)
+	-	Length modifiers 'll' and 'q' (libc 5 and 4.4 BSD)
+	-	This is not really a feature but incorrect characters in
+		formats are ignored and don't invalidate the format.
+*/
+int __printf(size_t size, const char *string, va_list args)
+{
+	struct Format format;
+
+	// Avoiding overflow by adjusting the size argument.
+	if(!size || size > __stdio_buffer_size)
+		size = __stdio_buffer_size;
+
+	// Initializing character() working values.
+	written	= 0;
+	total	= 0;
+	max	= size;
+
+	// Parsing the format string. At each iteration, a literal character, a
+	// '%%' identifier or a format is parsed.
+	while(*string)
+	{
+		// Literal text.
+		if(*string != '%')
+		{
+			character(*string++);
+			continue;
+		}
+
+		// Literal '%'.
+		if(string[1] == '%')
+		{
+			string += 2;
+			character('%');
+			continue;
+		}
+
+		// Getting the format.
+		format = get_format(&string);
+		if(!format.type) break;
+
+/*
+		// Displaying an information message.
+		printf(
+			"Format found :%s%c%c, options %d, and %d.%d "
+			"digits\n",
+			format.size ? " " : "",
+			format.size ? format.size : ' ',
+			format.type,
+			format.flags,
+			format.digits,
+			format.mantissa
+		);
+*/
+
+		switch(format.type)
+		{
+		// Signed integers.
+		case 'd':
+		case 'i':
+			format._int = va_arg(args, signed int);
+
+			// Reducing value depending on format size.
+			switch(format.size)
+			{
+			case 'h':
+				format._int &= 0x0000ffff;
+				break;
+			case 'i':
+				format._int &= 0x000000ff;
+				break;
+			}
+
+			format_di(format);
+			break;
+
+		// Unsigned integers.
+		case 'u':
+			format._unsigned = va_arg(args, unsigned int);
+			format_u(format);
+			break;
+		case 'o':
+		case 'x':
+		case 'X':
+			format._unsigned = va_arg(args, unsigned int);
+			format_oxX(format);
+			break;
+
+/*		// Exponent notation.
+		case 'e':
+		case 'E':
+			format._double = va_arg(args, double);
+			format_e(format);
+			break;
+*/
+		// Characters.
+		case 'c':
+			format._int = va_arg(args, signed int) & 0xff;
+			format_c(format);
+			break;
+
+		// Strings.
+		case 's':
+			format._pointer = va_arg(args, const char *);
+			format_s(format);
+			break;
+
+		// Pointers.
+		case 'p':
+			format._unsigned = va_arg(args, unsigned int);
+			format_p(format);
+			break;
+
+		// Character counter.
+		case 'n':
+			*va_arg(args, int *) = written;
+			break;
+		}
+	}
+
+	// Adding a terminating NUL character. Function character() should have
+	// left an empty byte for that.
+	__stdio_buffer[written] = 0;
+	return total;
+}
+
+/*
+	format_di()
+
+	Subroutine itoa(). Writes the given signed integer to the internal
+	buffer, trough function character().
+	It is used by conversion specifiers 'd' and 'i'.
+	Options '#' and '0' have no effect.
+*/
+static void format_di(struct Format format)
+{
+	// In integer display, character number includes pure digits and
+	// additional zeros and spacing.
+	// The precision represents the number of digits (pure digits and
+	// zeros) to print.
+	// For example: ' 0004', pure digits: 1, digits: 4, characters: 5.
+
+	int sign = 0;
+	signed int x = format._int;
+	// Using integers to store the number pure digits and additional spaces
+	// and zeros.
+	int bspaces, zeros, digits = 0, espaces;
+	// Using a multiplier to output digit in the correct order.
+	int multiplier = 1;
+
+	// Returning if the argument is null with an explicit precision of
+	// zero, but only if there are no spaces.
+	if(!x && format.characters == -1 && !format.precision) return;
+
+
+
+	//---
+	//	Computations.
+	//---
+
+	// Computing the number of digits and the multiplier.
+	x = abs(format._int);
+	if(!x) digits = 1;
+	else while(x)
+	{
+		digits++;
+		x /= 10;
+		if(x) multiplier *= 10;
+	}
+
+	// Getting the corresponding spacing.
+	get_spacing(format, &bspaces, &sign, &zeros, digits, &espaces);
+
+
+
+	//---
+	//	Output.
+	//---
+
+	character_n(' ', bspaces);
+	if(sign) character(sign);
+	character_n('0', zeros);
+
+	x = abs(format._int);
+	// Writing the pure digits, except if the value is null with an
+	// explicit precision of zero.
+	if(x || format.precision) while(multiplier)
+	{
+		character((x / multiplier) % 10 + '0');
+		multiplier /= 10;
+	}
+
+	character_n(' ', espaces);
+}
+
+/*
+	format_u()
+	Unsigned integers in base 10. Options ' ', '+' and '#' have no effect.
+*/
+static void format_u(struct Format format)
+{
+	int bspaces, zeros, digits = 0, espaces;
+	int x = format._unsigned;
+	int multiplier = 1;
+	int c;
+
+	// Computing number of digits.
+	if(!x) digits = 1;
+	else while(x)
+	{
+		digits++;
+		x /= 10;
+		if(x) multiplier *= 10;
+	}
+
+	get_spacing(format, &bspaces, NULL, &zeros, digits, &espaces);
+
+	//---
+	//	Output.
+	//---
+
+	character_n(' ', bspaces);
+	character_n('0', zeros);
+
+	x = format._unsigned;
+	while(multiplier)
+	{
+		character('0' + (x / multiplier) % 10);
+		multiplier /= 10;
+	}
+
+	character_n(' ', espaces);
+}
+
+/*
+	format_oxX()
+	Unsigned integers in base 8 or 16.
+	Since the argument is unsigned, options ' ' and '+' have no effect.
+	Option '#' adds prefix '0' in octal or '0x' in hexadecimal.
+*/
+static void format_oxX(struct Format format)
+{
+	// In unsigned display, the digit number specifies the minimal number
+	// of characters that should be output. If the prefix (alternative
+	// form) is present, it is part of this count.
+	// Integer part and decimal part digit numbers behave the same way as
+	// in signed integer display.
+
+	// Using integers to store the number of digits, zeros and spaces.
+	int bspaces, zeros, digits = 0, espaces;
+	unsigned int x = format._unsigned;
+	int multiplier = 0, shift, mask;
+	int c, disp;
+
+
+
+	//---
+	//	Computations.
+	//---
+
+	shift	= (format.type == 'o') ? (3) : (4);
+	mask 	= (1 << shift) - 1;
+	disp	= (format.type == 'x') ? (39) : (7);
+
+	// Computing number of digits.
+	if(!x) digits = 1;
+	else while(x)
+	{	
+		digits++;
+		x >>= shift;
+		if(x) multiplier += shift;
+	}
+
+	// Getting the spacing distribution.
+	get_spacing(format, &bspaces, NULL, &zeros, digits, &espaces);
+
+
+
+	//---
+	//	Output.
+	//---
+
+	character_n(' ', bspaces);
+	x = format._unsigned;
+
+	// Writing the alternative form prefix.
+	if(format.flags & Alternative && x)
+	{
+		character('0');
+		if(format.type != 'o') character(format.type);
+	}
+
+	character_n('0', zeros);
+
+	// Extracting the digits.
+	while(multiplier >= 0)
+	{
+		c = (x >> multiplier) & mask;
+		c += '0' + (c > 9) * disp;
+
+		character(c);
+		multiplier -= shift;
+	}
+
+	character_n(' ', espaces);
+}
+
+/*
+	format_e()
+	Exponent notation. Option '#' has no effect.
+
+static void format_e(struct Format format)
+{
+	// In exponent display, the precision is the number of digits after the
+	// dot.
+
+	// Using an integer to store the number exponent.
+	int exponent = 0;
+	// Using a double value for temporary computations, and another to
+	// store the format parameter.
+	double tmp = 1, x = format._double;
+	// Using spacing variables. Default length is for '0.e+00';
+	int bspaces, zeros, sign, length = 6, espaces;
+	// Using an iterator and a multiplier.
+	int i, mul;
+
+
+
+	//---
+	//	Computations.
+	//---
+
+	// Computing the exponent. For positive exponents, increasing until
+	// the temporary value gets greater than x.
+	if(x > 1)
+	{
+		// Looping until we haven't reached a greater exponent.
+		while(tmp < x)
+		{
+			// Incrementing the exponent.
+			exponent++;
+			// Multiplying the test value.
+			tmp *= 10;
+		}
+		// Removing an additional incrementation.
+		exponent--;
+	}
+	// For negative exponents, decreasing until it's lower.
+	else while(tmp > x)
+	{
+		// Decrementing the exponent.
+		exponent--;
+		// Dividing the test value.
+		tmp *= 0.1;
+	}
+
+	// Adding a character if the exponent is greater that 100.
+	if(exponent >= 100) length++;
+	// Adding another one if it's greater than 1000.
+	if(exponent >= 1000) length++;
+
+	// Adjusting the format precision, defaulting to 6.
+	if(format.precision == -1) format.precision = 6;
+	// Adding the decimal digits.
+	length += format.precision;
+
+	// Getting the space repartition.
+	get_spacing(format, &bspaces, &sign, &zeros, length, &espaces);
+
+
+
+	//---
+	//	Output.
+	//---
+
+	// Writing the beginning whitespaces.
+	character_n(' ', bspaces);
+	// Writing the sign if existing.
+	if(sign) character(sign);
+	// Writing the zeros.
+	character_n('0', zeros);
+
+	// Initializing x.
+	x = abs(format._double) / tmp;
+	// Writing the first digit.
+	character(x + '0');
+	character('.');
+
+	// Writing the decimal digits.
+	for(i = 0; i < format.precision; i++)
+	{
+		// Multiplying x by 10 and getting rid of the previous digit.
+		x = (x - (int)x) * 10;
+		// Writing the current digit.
+		character(x + '0');
+	}
+
+	// Writing the exponent letter and its sign.
+	character(format.type);
+	character(exponent < 0 ? '-' : '+');
+
+	// Getting a positive exponent.
+	exponent = abs(exponent);
+
+	// Using a multiplier for the exponent.
+	if(exponent >= 1000) mul = 1000;
+	else if(exponent >= 100) mul = 100;
+	else mul = 10;
+
+	// Writing the exponent characters.
+	while(mul)
+	{
+		// Writing the next character.
+		character((exponent / mul) % 10 + '0');
+		// Dividing the multiplier.
+		mul *= 0.1;
+	}
+
+	// Writing the ending whitespaces if left-aligned.
+	character_n(' ', espaces);
+}
+*/
+
+/*
+	format_c()
+	Character output. Only handles left alignment and spacing.
+	Options '#', '0', ' ' and '+', as well as mantissa digit number, have
+	no effect.
+*/
+static void format_c(struct Format format)
+{
+	// In character display, the digit number represents the number of
+	// characters written, including the argument and additional
+	// whitespaces.
+
+	int spaces = format.characters - 1;
+	int left = format.flags & LeftAlign;
+
+	if(!left) character_n(' ', spaces);
+	character(format._int & 0xff);
+	if(left) character_n(' ', spaces);
+}
+
+/*
+	format_s()
+	String output. Spaces if needed.
+*/
+void format_s(struct Format format)
+{
+	// In string display, the character number specify the minimum size of
+	// output (padded with whitespaces if needed) and the precision
+	// specify the maximum number of string characters output.
+
+	int string = format.precision;
+	int spaces;
+
+	const char *str = format._pointer;
+	int length, i;
+	int left = format.flags & LeftAlign;
+
+	// Computing length of string and number of whitespaces.
+	length = strlen(str);
+	if(string > length || string == -1) string = length;
+	spaces = format.characters - string;
+
+	if(!left) character_n(' ', spaces);
+	for(i = 0; i < string; i++) character(str[i]);
+	if(left) character_n(' ', spaces);
+}
+
+/*
+	format_p()
+	Pointer output. Simple hexadecimal dump. Prints "(nil)" if pointer is
+	NULL.
+*/
+void format_p(struct Format format)
+{
+	// Pointer display falls back to %#08x in the pointer is non-null,
+	// "(nil)" otherwise.
+
+	unsigned int x = format._unsigned;
+	int bspaces, zeros, digits = 0, espaces;
+	int c;
+
+	digits = x ? 10 : 5;
+	get_spacing(format, &bspaces, NULL, &zeros, digits, &espaces);
+
+	character_n(' ', bspaces);
+	character_n('0', zeros);
+
+	if(x)
+	{
+		character('0');
+		character('x');
+		while(x)
+		{
+			c = x >> 28;
+			c += '0' + 39 * (c > 9);
+			character(c);
+			x <<= 4;
+		}
+	}
+	else
+	{
+		character('(');
+		character('n');
+		character('i');
+		character('l');
+		character(')');
+	}
+
+	character_n(' ', espaces);
+}
diff --git a/src/stdio/vsnprintf.c b/src/stdio/vsnprintf.c
new file mode 100644
index 0000000..5cc13e3
--- /dev/null
+++ b/src/stdio/vsnprintf.c
@@ -0,0 +1,15 @@
+#include <internals/stdio.h>
+#include <stdio.h>
+#include <string.h>
+
+/*
+	vsnprintf()
+	The most generic formatted printing function around there.
+*/
+int vsnprintf(char *str, size_t size, const char *format, va_list args)
+{
+	int x = __printf(size, format, args);
+	strncpy(str, __stdio_buffer, size);
+
+	return x;
+}
diff --git a/src/stdio/vsprintf.c b/src/stdio/vsprintf.c
new file mode 100644
index 0000000..448c9da
--- /dev/null
+++ b/src/stdio/vsprintf.c
@@ -0,0 +1,15 @@
+#include <internals/stdio.h>
+#include <stdio.h>
+#include <string.h>
+
+/*
+	vsprintf()
+	Prints to a string from an argument list.
+*/
+int vsprintf(char *str, const char *format, va_list args)
+{
+	int x = __printf(0, format, args);
+	strncpy(str, __stdio_buffer, __stdio_buffer_size);
+
+	return x;
+}
diff --git a/src/string/strchr.c b/src/string/strchr.c
new file mode 100644
index 0000000..c90725d
--- /dev/null
+++ b/src/string/strchr.c
@@ -0,0 +1,11 @@
+#include <string.h>
+
+/*
+	strchr
+	Searches a character in a string.
+*/
+const char *strchr(const char *str, int value)
+{
+	while(*str && *str != value) *str++;
+	return *str ? str : NULL;
+}
diff --git a/src/string/strcpy.c b/src/string/strcpy.c
new file mode 100644
index 0000000..7659120
--- /dev/null
+++ b/src/string/strcpy.c
@@ -0,0 +1,11 @@
+#include <string.h>
+
+/*
+	strcpy()
+	Copies a string to another.
+*/
+char *strcpy(char *destination, const char *source)
+{
+	size_t length = strlen(source);
+	return memcpy(destination, source, length);
+}
diff --git a/src/string/strncpy.c b/src/string/strncpy.c
new file mode 100644
index 0000000..98422fa
--- /dev/null
+++ b/src/string/strncpy.c
@@ -0,0 +1,20 @@
+#include <string.h>
+
+/*
+	strncpy()
+	Copies part of a string to another.
+*/
+char *strncpy(char *destination, const char *source, size_t size)
+{
+	size_t length = strlen(source);
+
+	if(length >= size)
+	{
+		return memcpy(destination, source, size);
+	}
+	else
+	{
+		memset(destination + length, 0, size - length);
+		return memcpy(destination, source, length);
+	}
+}
diff --git a/src/tales/dprint.c b/src/tales/dprint.c
new file mode 100644
index 0000000..5547c52
--- /dev/null
+++ b/src/tales/dprint.c
@@ -0,0 +1,18 @@
+#include <internals/tales.h>
+#include <internals/stdio.h>
+#include <stdarg.h>
+
+/*
+	dprint()
+	Prints a formatted string. Works the same as printf().
+*/
+void dprint(int x, int y, const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	__printf(0, format, args);
+	va_end(args);
+
+	dtext(__stdio_buffer, x, y);
+}
diff --git a/src/tales/gprint.c b/src/tales/gprint.c
new file mode 100644
index 0000000..37e6862
--- /dev/null
+++ b/src/tales/gprint.c
@@ -0,0 +1,18 @@
+#include <internals/tales.h>
+#include <internals/stdio.h>
+#include <stdarg.h>
+
+/*
+	gprint()
+	Prints a formatted string. Works the same as printf().
+*/
+void gprint(int x, int y, const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	__printf(0, format, args);
+	va_end(args);
+
+	gtext(__stdio_buffer, x, y);
+}