diff --git a/include/gint/gint.h b/include/gint/gint.h
index 3f65ce5..f6f89b4 100644
--- a/include/gint/gint.h
+++ b/include/gint/gint.h
@@ -80,6 +80,14 @@ void gint_osmenu_native(void);
    @restart  0 to exit, 1 to restart by using gint_osmenu() */
 void gint_setrestart(int restart);
 
+/* gint_poweroff(): World switch and power off the calculator
+   Shows the CASIO logo / poweroff screen if show_logo is true. The program
+   will resume execution normally after powering on again. Don't call this
+   function with show_logo=false as a result of pressing AC/ON because the
+   calculator will restart immediately unless the user releases the AC/ON key
+   extremely quickly. */
+void gint_poweroff(bool show_logo);
+
 /* gint_set_onchip_save_mode(): Specify memory save policy for world switches
 
    World switches can cause corruption in on-chip memory in two ways. First, if
diff --git a/include/gint/keyboard.h b/include/gint/keyboard.h
index 1289991..73fb87d 100644
--- a/include/gint/keyboard.h
+++ b/include/gint/keyboard.h
@@ -258,11 +258,13 @@ enum {
 	GETKEY_MENU_DUPDATE   = 0x0100,
 	/* After coming back from the main menu, send a KEYEV_OSMENU event */
 	GETKEY_MENU_EVENT     = 0x0200,
+	/* Enable power off with SHIFT + AC/ON */
+	GETKEY_POWEROFF       = 0x0400,
 
 	/* No modifiers */
 	GETKEY_NONE           = 0x0000,
 	/* Default settings of getkey() */
-	GETKEY_DEFAULT        = 0x01df,
+	GETKEY_DEFAULT        = 0x05df,
 };
 
 /* getkey_feature_t: Custom feature function
diff --git a/src/kernel/kernel.h b/src/kernel/kernel.h
index a136c9a..3efc8cb 100644
--- a/src/kernel/kernel.h
+++ b/src/kernel/kernel.h
@@ -8,6 +8,10 @@
 /* gint_load_onchip_sections(): Initialize on-chip memory sections */
 void gint_load_onchip_sections(void);
 
+/* gint_copy_vram(): Copy gint's VRAM to the OS to avoid flickering during
+   certain world switches. */
+void gint_copy_vram(void);
+
 /* kinit(): Install and start gint */
 void kinit(void);
 
diff --git a/src/kernel/osmenu.c b/src/kernel/osmenu.c
index bd1351f..a98a721 100644
--- a/src/kernel/osmenu.c
+++ b/src/kernel/osmenu.c
@@ -2,6 +2,7 @@
 #include <gint/display.h>
 #include <gint/hardware.h>
 #include <gint/keyboard.h>
+#include "kernel.h"
 
 #include <string.h>
 
@@ -12,7 +13,6 @@ int   __Timer_Deinstall(int id);
 int   __PutKeyCode(int row, int column, int keycode);
 int   __GetKeyWait(int *col,int *row,int type,int time,int menu,uint16_t *key);
 void  __ClearKeyBuffer(void); /* ? */
-void *__GetVRAMAddress(void);
 void  __ConfigureStatusArea(int mode);
 void __SetQuitHandler(void (*callback)(void));
 
@@ -95,28 +95,12 @@ static os_menu_function_t *find_os_menu_function(void)
 void gint_osmenu_native(void)
 {
 	__ClearKeyBuffer();
-
-	#ifdef FX9860G
-	memcpy(__GetVRAMAddress(), gint_vram, 1024);
-	#endif
+	gint_copy_vram();
 
 	#ifdef FXCG50
 	/* Unfortunately ineffective (main menu probably reenables it)
 	__ConfigureStatusArea(3); */
 
-	/* TODO: Improve copied VRAM behavior in gint_osmenu() on fxcg50 */
-	uint16_t *vram1, *vram2;
-	dgetvram(&vram1, &vram2);
-
-	uint16_t *dst = __GetVRAMAddress();
-	uint16_t *src = (gint_vram == vram1) ? vram2 + 6 : vram1 + 6;
-
-	for(int y = 0; y < 216; y++, dst+=384, src+=396)
-	for(int x = 0; x < 384; x++)
-	{
-		dst[x] = src[x];
-	}
-
 	/* Try to use the internal function directly if we could figure out its
 	   address by dynamically disassembling */
 	os_menu_function_t *fun = find_os_menu_function();
diff --git a/src/kernel/syscalls.S b/src/kernel/syscalls.S
index f089cb7..cb7a58d 100644
--- a/src/kernel/syscalls.S
+++ b/src/kernel/syscalls.S
@@ -45,6 +45,7 @@
 .global ___SetQuitHandler
 
 /* Reset */
+.global ___PowerOff
 .global ___Reset
 
 #define syscall_(id, syscall_table)	\
@@ -120,6 +121,8 @@ ___SetQuitHandler:
 
 /* Reset */
 
+___PowerOff:
+	syscall(0x3f4)
 ___Reset:
 	syscall(0x236)
 
@@ -198,6 +201,8 @@ ___SpecialMatrixCodeProcessing:
 
 /* Reset */
 
+___PowerOff:
+	syscall(0x1839)
 ___Reset:
 	syscall(0x1187)
 
diff --git a/src/kernel/world.c b/src/kernel/world.c
index 4b006ff..aed10b2 100644
--- a/src/kernel/world.c
+++ b/src/kernel/world.c
@@ -4,6 +4,7 @@
 #include <gint/exc.h>
 #include <gint/defs/call.h>
 #include <gint/hardware.h>
+#include <gint/display.h>
 #include "kernel.h"
 
 #include <stdlib.h>
@@ -214,3 +215,34 @@ int gint_get_onchip_save_mode(void **ptr)
 		*ptr = onchip_save_buffer;
 	return onchip_save_mode;
 }
+
+void gint_copy_vram(void)
+{
+	void *__GetVRAMAddress(void);
+
+	#ifdef FX9860G
+	memcpy(__GetVRAMAddress(), gint_vram, 1024);
+	#endif
+
+	#ifdef FXCG50
+	/* TODO: Improve copied VRAM behavior in gint_osmenu() on fxcg50 */
+	uint16_t *vram1, *vram2;
+	dgetvram(&vram1, &vram2);
+
+	uint16_t *dst = __GetVRAMAddress();
+	uint16_t *src = (gint_vram == vram1) ? vram2 + 6 : vram1 + 6;
+
+	for(int y = 0; y < 216; y++, dst+=384, src+=396)
+	for(int x = 0; x < 384; x++)
+	{
+		dst[x] = src[x];
+	}
+	#endif
+}
+
+void gint_poweroff(bool show_logo)
+{
+	void __PowerOff(int show_logo);
+	gint_copy_vram();
+	gint_world_switch(GINT_CALL(__PowerOff, (int)show_logo));
+}
diff --git a/src/keysc/getkey.c b/src/keysc/getkey.c
index 421dc12..0aa16fd 100644
--- a/src/keysc/getkey.c
+++ b/src/keysc/getkey.c
@@ -75,6 +75,16 @@ key_event_t getkey_opt(int opt, volatile int *timeout)
 			e.type = KEYEV_OSMENU;
 		}
 
+		/* Poweroff */
+		if((opt & GETKEY_POWEROFF) && e.type == KEYEV_DOWN &&
+			e.key == KEY_ACON && e.shift && !e.alpha)
+		{
+			gint_poweroff(true);
+			if(opt & GETKEY_MENU_DUPDATE)
+				dupdate();
+			continue;
+		}
+
 		if(e.type != KEYEV_NONE || e.type != KEYEV_UP)
 		{
 			/* Custom global features */