diff --git a/Makefile b/Makefile
index bb6d41b..9a01f78 100644
--- a/Makefile
+++ b/Makefile
@@ -12,7 +12,8 @@
 #---
 
 # Modules
-modules-gint	= bopti core display gray keyboard mpu screen tales timer
+modules-gint	= core keyboard mmu mpu rtc screen timer \
+		  bopti display gray tales
 modules-libc	= setjmp string
 
 # Targets
@@ -28,7 +29,7 @@ ob	= sh3eb-elf-objcopy
 wr	= g1a-wrapper
 
 # Flags
-cflags		= -m3 -mb -nostdlib -I include -ffreestanding -std=c11
+cflags		= -m3 -mb -nostdlib -I include -ffreestanding -std=c11 -Os
 
 # Demo application (could be done better)
 demo-src	= $(notdir $(wildcard demo/*.[cs]))
@@ -40,6 +41,10 @@ demo-elf	= build/gintdemo.elf
 demo-bin	= build/gintdemo.bin
 demo-libs	= -lgcc -L. -lgint -lc
 
+# Specific objects
+obj-lib-spec	= build/display_font_system.bmp.o
+obj-std-spec	=
+
 
 
 #---
@@ -58,14 +63,16 @@ endef
 $(foreach mod, $(modules), $(eval \
 	mod-$(mod)-c	= $(notdir $(wildcard src/$(mod)/*.c))		$n\
 	mod-$(mod)-asm	= $(notdir $(wildcard src/$(mod)/*.s))		$n\
-	mod-$(mod)-dep	= $(wildcard include/*.h src/$(mod)/*.h)	$n\
 	mod-$(mod)-src	= $$(mod-$(mod)-c)$$(mod-$(mod)-asm)		$n\
 	mod-$(mod)-obj	= $$(patsubst %,build/$(mod)_%.o,$$(mod-$(mod)-src)) \
 ))
 
 # Target-scope variables.
-obj-std = $(foreach mod,$(modules-libc),$(mod-$(mod)-obj))
-obj-lib	= $(foreach mod,$(modules-gint),$(mod-$(mod)-obj))
+obj-std = $(foreach mod,$(modules-libc),$(mod-$(mod)-obj)) $(obj-std-spec)
+obj-lib	= $(foreach mod,$(modules-gint),$(mod-$(mod)-obj)) $(obj-lib-spec)
+
+# Dependencies
+hdr-dep = $(wildcard include/*.h include/internals/*.h)
 
 
 
@@ -77,8 +84,8 @@ obj-lib	= $(foreach mod,$(modules-gint),$(mod-$(mod)-obj))
 #   $1  module name
 #   $2  filename
 define rule-c-source
-build/$1_$2.o: src/$1/$2 $(mod-$1-dep)
-	$(cc) -c $$< -o $$@ $(cflags) -I src/$1 -O2
+build/$1_$2.o: src/$1/$2 $(hdr-dep)
+	$(cc) -c $$< -o $$@ $(cflags) -I src/$1
 endef
 
 # asm source file template:
@@ -98,21 +105,24 @@ endef
 # Generic rules
 
 all: build $(target-std) $(target-lib) $(target-g1a)
-	@ echo 'All done!'
+	@echo "[ \033[32;1mOK\033[0m ] All done!"
 
 build:
 	mkdir -p $@
 
 $(target-std): $(obj-std)
 	$(ar) rcs $@ $^
+	@echo "[ \033[32;1mOK\033[0m ] libc: `stat -c %s $@` bytes"
 
 $(target-lib): $(target-std) $(obj-lib)
 	$(ar) rcs $@ $(obj-lib)
+	@echo "[ \033[32;1mOK\033[0m ] libgint: `stat -c %s $@` bytes"
 
 $(target-g1a): $(target-std) $(target-lib) $(demo-obj)
 	$(cc) -o $(demo-elf) $(cflags) -T $(demo-ld) $(demo-obj) $(demo-libs)
 	$(ob) -R .comment -R .bss -O binary $(demo-elf) $(demo-bin)
 	$(wr) $(demo-bin) -o $@ -i $(demo-icon)
+	@echo "[ \033[32;1mOK\033[0m ] demo app: `stat -c %s $@` bytes"
 
 # Automated rules
 
@@ -123,22 +133,27 @@ $(foreach mod,$(modules), \
 		$(call rule-asm-source,$(mod),$(source)))) \
 )
 
+# Specific rules
+
 # This one should not be optimized. It makes __attribute__((interrupt_handler))
 # buggy... maybe. Anyway there's a bug in this file.
 build/core_gint.c.o: src/core/gint.c $(mod-core-dep)
-	$(cc) -c $< -o $@ $(cflags) -I src/core
+	$(cc) -c $< -o $@ $(cflags) -I src/core -O0
+
+build/display_font_system.bmp.o: src/display/font_system.bmp
+	fxconv $< -o $@ --font -n gint_font_system
 
 # Demo application
 
 build/demo_%.c.o: demo/%.c
 	$(cc) -c $< -o $@ $(cflags)
 
+build/demo_font_%.bmp.o: demo/resources/font_%.bmp
+	fxconv $< -o $@ --font -n $(patsubst demo/resources/%.bmp,res_%,$<)
+
 build/demo_%.bmp.o: demo/resources/%.bmp
 	fxconv $< -o $@ -n $(patsubst demo/resources/%.bmp,res_%,$<)
 
-build/demo_font.bmp.o: demo/resources/font.bmp
-	fxconv $< -o $@ --font -n res_font
-
 
 
 #---
diff --git a/TODO b/TODO
index 81094a0..9a46c54 100644
--- a/TODO
+++ b/TODO
@@ -10,24 +10,21 @@
 
 
 @  vram overflow
-@  keyboard test threading interface
+@  keyboard test threaded interface
 
++  full and partial transparency
 +  gint vs. ML with 248x124 at (-60, -28)
-+  use alloca() for tales
 +  call exit handlers
 +  compute frequencies
 +  gray text
-+  effective rtc callback
-+  properly test gray drawing
 +  upgraded blending modes
 +  blending modes for text
 +  information masks for text
 +  test all font encodings
 +  font clipping
 +  bitmap parts
-+  bitmap clipping
 
--  install critical failure handler to prevent failing resets
+-  improve exception handler debugging information (if possible)
 -  write and test gray engine
 -  full rtc driver (time)
 -  callbacks and complete user API
@@ -35,7 +32,7 @@
 ~  shadowy rectangle effect for Shift + Alpha + Left + Down
 ~  exhaustive save for setjmp()
 ~  registers that need to be saved when configuring gint
-~  possible bug when -O2 __attribute__((interrupt_handler))
+~  possible bug when -O2'ing __attribute__((interrupt_handler))
 
 
 
@@ -43,8 +40,8 @@ Some notes
 ----------
 
 Test cases for bitmap drawing:
-- aligned 32 / non-aligned 32
+- 32-alignment
 - monochrome / gray
 - small / large
-- does not overflow / overflows
+- clipping
 # blending modes
diff --git a/demo/gintdemo.c b/demo/gintdemo.c
index f41d596..cfadaae 100644
--- a/demo/gintdemo.c
+++ b/demo/gintdemo.c
@@ -2,6 +2,7 @@
 #include <string.h>
 
 #include <mpu.h>
+#include <gint.h>
 #include <keyboard.h>
 #include <display.h>
 #include <timer.h>
@@ -10,62 +11,67 @@
 #include <stdint.h>
 #include <7305.h>
 
+
+
 //---
 //	A few ugly procedures for displaying text. Will have to enhance this
 //	soon -- which means printf().
 //---
 
-void print(const char *str, int x, int y)
+void locate(const char *str, int x, int y)
 {
-	dtext(str, x, 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 print_hex(unsigned int n, int x, int y)
+
+void locate_hex(unsigned int n, int x, int y)
 {
-	char ch[11] = "0x";
+	char str[11] = "0x";
 	int i;
 
 	for(i = 0; i < 8; i++)
 	{
-		ch[9 - i] = (n & 0xf) + '0' + 39 * ((n & 0xf) > 9);
+		str[9 - i] = (n & 0xf) + '0' + 39 * ((n & 0xf) > 9);
 		n >>= 4;
 	}
-	ch[10] = 0;
-	print(ch, x, y);
+	str[10] = 0;
+	locate(str, x, y);
 }
-void print_bin(unsigned char n, int x, int y)
+void locate_bin(unsigned char n, int x, int y)
 {
-	char ch[9];
+	char str[9];
 	int i;
 
 	for(i = 0; i < 8;i ++)
 	{
-		ch[7 - i] = (n & 1) + '0';
+		str[7 - i] = (n & 1) + '0';
 		n >>= 1;
 	}
-	ch[8] = 0;
-	print(ch, x, y);
+	str[8] = 0;
+	locate(str, x, y);
 }
-void print_hexa(unsigned int n, int digits, int x, int y)
+void locate_hexa(unsigned int n, int digits, int x, int y)
 {
-	char ch[20];
+	char str[20];
 	int i;
 
 	for(i = digits - 1; i >= 0; i--)
 	{
-		ch[i] = (n & 0xf) + '0' + 39 * ((n & 0xf) > 9);
+		str[i] = (n & 0xf) + '0' + 39 * ((n & 0xf) > 9);
 		n >>= 4;
 	}
 
-	ch[digits] = 0;
-	print(ch, x, y);
+	str[digits] = 0;
+	locate(str, x, y);
 }
-void print_int(int n, int x, int 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'; print(str, x, y); return; }
+	if(!n) { str[o++] = '0'; locate(str, x, y); return; }
 	if(n < 0) str[o++] = '-', n = -n;
 	while(copy) digits++, copy /= 10;
 
@@ -75,7 +81,7 @@ void print_int(int n, int x, int y)
 		n /= 10;
 	}
 
-	gtext(str, x, y);
+	locate(str, x, y);
 }
 
 
@@ -97,17 +103,17 @@ void keyboard_test_timer(void)
 
 	dclear_area(5, 10, 71, 34);
 
-	print_bin(state[0], 5, 10);
-	print_bin(state[1], 5, 16);
-	print_bin(state[2], 5, 22);
-	print_bin(state[3], 5, 28);
-	print_bin(state[4], 5, 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);
 
-	print_bin(state[5], 40, 10);
-	print_bin(state[6], 40, 16);
-	print_bin(state[7], 40, 22);
-	print_bin(state[8], 40, 28);
-	print_bin(state[9], 40, 34);
+	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);
 
 	dupdate();
 }
@@ -127,8 +133,8 @@ void keyboard_test(void)
 	timer_start(TIMER_USER, 1700, TIMER_Po_256, keyboard_test_timer, 0);
 
 	dclear();
-	print("Keyboard state:", 0, 0);
-	print("multi-getkey ^^", 50, 55);
+	locate("Keyboard state:", 0, 0);
+	locate("multi-getkey ^^", 50, 55);
 	dupdate();
 
 	while(1)
@@ -142,14 +148,14 @@ void keyboard_test(void)
 		x = (x + 1) & 15;
 		str[0] = hexa(x);
 		str[1] = 0;
-		print(str, 100, 0);
+		locate(str, 100, 0);
 
 		for(i = 0; i < 4; i++)
 		{
 			str[0] = hexa((keys[i] >> 4) & 0x0f);
 			str[1] = hexa(keys[i] & 0x0f);
 			str[2] = 0;
-			print(str, 100, 16 + 10 * i);
+			locate(str, 100, 16 + 10 * i);
 		}
 
 		#undef	hexa
@@ -160,10 +166,12 @@ void keyboard_test(void)
 	timer_stop(TIMER_USER);
 }
 
+
 /*
 	bitmap_test()
 	Displays various bitmaps to ensure bopti is working correctly.
 */
+/*
 void bitmap_test(void)
 {
 	extern Image res_bitmap_opt_start;
@@ -171,12 +179,14 @@ void bitmap_test(void)
 	extern Image res_symbol2_start;
 	extern Image res_sprites_start;
 	extern Image res_swords_start;
+	extern Image res_items_start;
 
 	Image *opt	= &res_bitmap_opt_start;
 	Image *sybl	= &res_symbol_start;
 	Image *sybl2	= &res_symbol2_start;
 	Image *sprites	= &res_sprites_start;
 	Image *swords	= &res_swords_start;
+	Image *items	= &res_items_start;
 
 	uint32_t a32 = 0xffffffff;
 	int black_bg = 0, gray = 0;
@@ -191,10 +201,9 @@ void bitmap_test(void)
 			gclear();
 
 			if(black_bg) greverse_area(0, 0, 127, 63);
-			gimage(opt, 0, 57);
+			gimage(swords, 0, 57);
 
-			gimage(sprites, x, y);
-			gimage(swords, x, y + 35);
+			gimage(items, x, y);
 
 			gupdate();
 		}
@@ -229,29 +238,28 @@ void bitmap_test(void)
 	gray_stop();
 	return;
 }
-
+*/
 
 
 /*
 	text_test()
 	Renders text.
 */
-
 void text_test(void)
 {
-	extern Font res_font_start;
-	Font *font = &res_font_start;
+	extern Font res_font_modern_start;
+	Font *font = &res_font_modern_start;
 
 	text_configure(font);
 
 	dclear();
 
-	print(" !\"#$%&'()*+,-./", 10, 10);
-	print("0123456789:;<=>?", 10, 16);
-	print("@ABCDEFGHIJKLMNO", 10, 22);
-	print("PQRSTUVWXYZ[\\]^_", 10, 28);
-	print("`abcdefghijklmno", 10, 34);
-	print("pqrstuvwxyz{|}~", 10, 40);
+	dtext(" !\"#$%&'()*+,-./", 10, 10);
+	dtext("0123456789:;<=>?", 10, 16);
+	dtext("@ABCDEFGHIJKLMNO", 10, 22);
+	dtext("PQRSTUVWXYZ[\\]^_", 10, 28);
+	dtext("`abcdefghijklmno", 10, 34);
+	dtext("pqrstuvwxyz{|}~", 10, 40);
 
 	dupdate();
 
@@ -264,11 +272,9 @@ void text_test(void)
 	gray_test()
 	Runs the gray engine.
 */
-
 void gray_test(void)
 {
-	extern Image res_illustration_start;
-	Image *illustration = &res_illustration_start;
+	extern Image res_opt_gray_start;
 
 	int *v1, *v2;
 
@@ -297,16 +303,15 @@ void gray_test(void)
 					-(i < 32);
 			}
 
-//			gimage(illustration, 0, 0);
-//			gclear_area(64, 0, 127, 63);
+			locate("light", 15, 2);
+			locate_int(delays[0], 15, 3);
 
-			gtext("light", 78, 6);
-			print_int(delays[0], 103, 6);
+			locate("dark", 15, 5);
+			locate_int(delays[1], 15, 6);
 
-			gtext("dark", 78, 15);
-			print_int(delays[1], 103, 15);
+			locate("\x02", 14, selected ? 6 : 3);
 
-			gtext(">", 70, selected ? 15 : 6);
+			gimage(&res_opt_gray_start, 0, 56);
 			gupdate();
 		}
 
@@ -320,19 +325,15 @@ void gray_test(void)
 		switch(key)
 		{
 		case KEY_F1:
-			delays[0] = 860;
-			delays[1] = 1298;
+			selected = !selected;
 			break;
 		case KEY_F2:
-			delays[0] = 912;
-			delays[1] = 1343;
-			break;
-		case KEY_F3:
 			delays[0] = 993;
 			delays[1] = 1609;
 			break;
-		case KEY_F6:
-			selected = !selected;
+		case KEY_F3:
+			delays[0] = 860;
+			delays[1] = 1298;
 			break;
 		case KEY_UP:
 			delays[selected] += 10;
@@ -356,56 +357,6 @@ void gray_test(void)
 }
 
 /*
-	main_menu()
-	Displays the main menu and returns user's choice.
-
-	@return	User choice. 0 means EXIT, other numbers are applications.
-*/
-int main_menu(void)
-{
-	extern unsigned int bgint, egint;
-	const char *mpu_names[] = {
-		"MPU_Unkown",
-		"MPU_SH7337",
-		"MPU_SH7355",
-		"MPU_SH7305",
-		"MPU_SH7724",
-		"MPU Error !"
-	};
-	int key;
-
-	dclear();
-
-	print("gint test application", 19, 1);
-	dline(19, 8, 107, 8, Color_Black);
-
-	print("[1] Keyboard", 10, 17);
-	print("[2] Bitmap drawing", 10, 24);
-	print("[3] Text rendering", 10, 31);
-	print("[4] Gray engine", 10, 38);
-
-	print("mpu type:", 2, 49);
-	print(mpu_names[MPU_CURRENT < 5 ? MPU_CURRENT : 5], 50, 48);
-	print("gint size:", 2, 56);
-	print_hex(&egint - &bgint, 50, 56);
-
-	dupdate();
-
-	while(1)
-	{
-		key = getkey();
-		if(key == KEY_EXIT) return 0;
-
-		if(key == KEY_1) return 1;
-		if(key == KEY_2) return 2;
-		if(key == KEY_3) return 3;
-		if(key == KEY_4) return 4;
-		if(key == KEY_5) return 5;
-	}
-
-	return 0;
-}
-
 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,
 0, 0, 0, 0, 0, 0, 0, 7, 159, 0, 0, 1, 192, 0, 0, 0, 0, 0, 121, 240, 0, 0, 0,
@@ -505,7 +456,7 @@ void ML_bmp_or_cl(const unsigned char *bmp, int x, int y, int width, int height)
 	}
 }
 
-#include <../src/timer/timer_internals.h>
+#include <internals/timer.h>
 void debug(void)
 {
 	extern Image res_screen_start;
@@ -551,32 +502,292 @@ void debug(void)
 	dupdate();
 	while(getkey() != KEY_EXIT);
 }
+*/
 
 /*
-	main()
-	Handles application calls.
-
-	@return	0.
+	tlb_debug()
+	Displays the TLB contents and some information. Only available for
+	SH7705, because the SH7305's TLB is much more complicated.
 */
-int main(void)
+void tlb_debug(void)
 {
-	extern Font res_font_start;
-	Font *font = &res_font_start;
+	// Entry address address (pointer in the address array), entry data
+	// address (pointer in the data address), and their contents.
+	unsigned int address, data, a, d;
+	// Virtual page number and physical page number.
+	unsigned int vpn, ppn;
+	// Contents of register MMUCR.
+	unsigned mmucr;
 
-	text_configure(font);
+	int i, r, key = 0;
+	int way = 0, entry = 0;
+	int pointer_base;
 
-	int app;
+	const char *protection[] = { "pr", "prw", "ar", "arw" };
+	mmucr = *((volatile unsigned int *)gint_reg(Register_MMUCR));
+
+	dclear();
+	locate("MMU register info", 1, 1);
+	locate("MMUCR.IX = ", 2, 3);
+	locate(mmucr & 0x02 ? "1" : "0", 13, 3);
+	dupdate();
+	getkey();
+
+	while(key != KEY_EXIT && way < 4)
+	{
+		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);
+
+		for(i = 0; i < 3 && entry < 32; i++, entry++)
+		{
+			address	= 0xf2000000 | (entry << 12) | (way << 8);
+			data	= 0xf3000000 | (entry << 12) | (way << 8);
+
+			a = *((volatile unsigned int *)address);
+			d = *((volatile unsigned int *)data);
+
+			ppn = (d >> 10) & 0x00007ffff;
+			// 4-kbyte page
+			if(d & 0x08)
+			{
+				vpn = (a >> 12) | entry;
+				pointer_base = vpn << 12;
+			}
+			// 1-kbyte page
+			else
+			{
+				vpn = (a >> 10) | (entry << 2);
+				pointer_base = vpn << 10;
+			}
+
+			r = 2 * i + 3;
+			locate_hexa(pointer_base, 8, 1, r);
+			locate(":", 11, r);
+			locate_hexa(ppn << 10, 8, 12, r);
+
+			r++;
+			locate((d & 0x08) ? "4k" : "1k", 1, r);
+			locate("pr=", 5, r);
+			locate(protection[(d >> 5) & 3], 8, r);
+			locate((d & 0x02) ? "shared" : "exclusive", 13, r);
+		}
+
+		if(entry == 32) entry = 0, way++;
+
+		dupdate();
+		key = getkey();
+	}
+}
+
+/*
+	main_menu()
+	Displays the main menu and returns user's choice: 0 for [EXIT],
+	application numbers otherwise. Sets the ctaegory and application
+	number.
+*/
+void main_menu(int *category, int *app)
+{
+	//---
+	//	Quite a few things to declare...
+	//---
+
+	extern Image res_opt_menu_start;
+
+	const char *mpu, *mpu_names[] = {
+		"Unknown",
+		"SH7337",
+		"SH7355",
+		"SH7305",
+		"SH7724",
+		"[error]"
+	};
+
+	const char *list_tests[] = {
+		"Keyboard",
+		"Gray engine",
+		"Image rendering",
+		"Text rendering",
+		"Real-time clock",
+		NULL
+	};
+	const char *list_perfs[] = {
+		"Image rendering",
+		"Text rendering",
+		NULL
+	};
+	const char *list_debug[] = {
+		"View TLB (SH3 only)",
+		NULL
+	};
+	const char **list;
+
+	extern unsigned int bgint, egint;
+	extern unsigned int romdata;
+	int gint_size = &egint - &bgint;
+
+
+
+	static int tab = 0, index = 0;
+	// Set to 1 when interface has to be redrawn.
+	int leave = 1;
+	int i;
+
+	mpu = mpu_names[MPU_CURRENT < 5 ? MPU_CURRENT : 5];
+	text_configure_default();
 
 	while(1)
 	{
-		app = main_menu();
-		if(!app) break;
+		//---
+		//	Displaying the current tab.
+		//---
 
-		if(app == 1) keyboard_test();
-		if(app == 2) bitmap_test();
-		if(app == 3) text_test();
-		if(app == 4) gray_test();
-		if(app == 5) debug();
+		dclear();
+		dupdate();
+
+		switch(tab)
+		{
+		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);
+
+			list = NULL;
+			break;
+
+		case 1:
+			locate("Test list", 1, 1);
+			list = list_tests;
+			break;
+
+		case 2:
+			locate("Performance", 1, 1);
+			list = list_perfs;
+			break;
+
+		case 3:
+			locate("Debug", 1, 1);
+			list = list_debug;
+			break;
+
+		default:
+			locate("Tab ", 1, 1);
+			locate_int(tab, 5, 1);
+			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);
+		}
+		dupdate();
+
+		//---
+		//	Waiting for events.
+		//---
+
+		do
+		{
+			leave = 1;
+
+			switch(getkey())
+			{
+			case KEY_F1:
+				tab = 0;
+				index = 0;
+				break;
+			case KEY_F2:
+				tab = 1;
+				index = 0;
+				break;
+			case KEY_F3:
+				tab = 2;
+				index = 0;
+				break;
+			case KEY_F4:
+				tab = 3;
+				index = 0;
+				break;
+
+			case KEY_UP:
+				if(list && index) index--;
+				break;
+			case KEY_DOWN:
+				if(list && list[index + 1]) index++;
+				break;
+
+			case KEY_EXE:
+				if(!tab) break;
+				if(category) *category = tab;
+				if(app) *app = index + 1;
+				return;
+
+			case KEY_EXIT:
+			case KEY_MENU:
+				if(category) *category = 0;
+				if(app) *app = 0;
+				return;
+
+			default:
+				leave = 0;
+			}
+		}
+		while(!leave);
+	}
+
+	if(category) *category = 0;
+	if(app) *app = 0;
+	return;
+}
+
+/*
+	main()
+	No need for description.
+*/
+int main(void)
+{
+	int category, app;
+
+	while(1)
+	{
+		main_menu(&category, &app);
+		if(!category) break;
+
+		switch((category << 8) | app)
+		{
+		case 0x0101:
+			keyboard_test();
+			break;
+		case 0x0102:
+			gray_test();
+			break;
+		case 0x0103:
+//			bitmap_test();
+			break;
+		case 0x0104:
+			text_test();
+			break;
+		case 0x0105:
+//			rtc_test();
+			break;
+
+		case 0x0301:
+			if(isSH3()) tlb_debug();
+			break;
+		}
 	}
 
 	return 0;
diff --git a/demo/gintdemo.ld b/demo/gintdemo.ld
index 512f5db..cf7bb2f 100644
--- a/demo/gintdemo.ld
+++ b/demo/gintdemo.ld
@@ -17,9 +17,8 @@ ENTRY(_start)
 MEMORY
 {
 	rom	: o = 0x00300200, l = 512k
-	ram	: o = 0x08100000, l = 64k
-	/* The "real ram" accessible length remains unknown because some parts
-	are used by the system. At least 12k seem accessible. Use with care. */
+	/* 0x0810000 is apparently mapped to 0x8801c0000. */
+	ram	: o = 0x08100000, l = 8k
 	realram	: o = 0x8800d000, l = 12k
 }
 
@@ -46,6 +45,7 @@ SECTIONS
 	} > rom
 
 	.rodata : {
+		*(.rodata.fxconv);
 		*(.rodata)
 		*(.rodata.*)
 
@@ -84,16 +84,25 @@ SECTIONS
 
 
 	/*
-		Real RAM : interrupt handler.
+		Real RAM : interrupt, exception and TLB miss handlers.
 	*/
 
-	.gint_int : AT(_gint_data) ALIGN(4) {
+	.gint : AT(_gint_data) ALIGN(4) {
 		/* The vbr needs to be 0x100-aligned because of an ld issue. */
 		. = ALIGN(0x100) ;
 		_gint_vbr = . ;
-
 		_bgint = . ;
 
+		/* Exception handler. */
+		. = _gint_vbr + 0x100 ;
+		*(.gint.exc.entry)
+		*(.gint.exc)
+
+		/* TLB miss handler. */
+		. = _gint_vbr + 0x400 ;
+		*(.gint.tlb.entry)
+		*(.gint.tlb)
+
 		/* Interrupt handler. */
 		. = _gint_vbr + 0x600 ;
 		*(.gint.int.entry)
diff --git a/demo/resources/font.bmp b/demo/resources/font_modern.bmp
similarity index 99%
rename from demo/resources/font.bmp
rename to demo/resources/font_modern.bmp
index c577abd..5c1c91b 100644
Binary files a/demo/resources/font.bmp and b/demo/resources/font_modern.bmp differ
diff --git a/demo/resources/illustration.bmp b/demo/resources/illustration.bmp
deleted file mode 100644
index ca8755a..0000000
Binary files a/demo/resources/illustration.bmp and /dev/null differ
diff --git a/demo/resources/items.bmp b/demo/resources/items.bmp
new file mode 100644
index 0000000..ec6a419
Binary files /dev/null and b/demo/resources/items.bmp differ
diff --git a/demo/resources/opt_gray.bmp b/demo/resources/opt_gray.bmp
new file mode 100644
index 0000000..a44613d
Binary files /dev/null and b/demo/resources/opt_gray.bmp differ
diff --git a/demo/resources/opt_menu.bmp b/demo/resources/opt_menu.bmp
new file mode 100644
index 0000000..4d682e4
Binary files /dev/null and b/demo/resources/opt_menu.bmp differ
diff --git a/gintdemo.g1a b/gintdemo.g1a
index ec073c9..7a61a46 100644
Binary files a/gintdemo.g1a and b/gintdemo.g1a differ
diff --git a/include/alloca.h b/include/alloca.h
new file mode 100644
index 0000000..9cf0899
--- /dev/null
+++ b/include/alloca.h
@@ -0,0 +1,23 @@
+//---
+//
+//	gint core module: alloca
+//
+//	Allows dynamic memory allocation on the stack. Memory is automatically
+//	freed when the calling function exits.
+//
+//---
+
+#ifndef	_ALLOCA_H
+#define	_ALLOCA_H	1
+
+#include <stddef.h>
+
+/*
+	alloca()
+	Allocates a memory block on the stack.
+*/
+void *alloca(size_t size);
+
+#define	alloca(size)	__builtin_alloca(size)
+
+#endif	// _ALLOCA_H
diff --git a/include/ctype.h b/include/ctype.h
index 82748b5..8c5bbd5 100644
--- a/include/ctype.h
+++ b/include/ctype.h
@@ -1,5 +1,5 @@
-#ifndef _CTYPE_H
-#define _CTYPE_H 1
+#ifndef	_CTYPE_H
+#define	_CTYPE_H 1
 
 // Character definition macros.
 #define isalnum(c)	(isdigit(c)	|| isalpha(c))
@@ -24,4 +24,4 @@
 #define tolower(c) (isupper(c) ? (c) |  32 : (c))
 #define toupper(c) (islower(c) ? (c) & ~32 : (c))
 
-#endif // _CTYPE_H
+#endif	// _CTYPE_H
diff --git a/include/gint.h b/include/gint.h
index e842bbd..879d576 100644
--- a/include/gint.h
+++ b/include/gint.h
@@ -10,6 +10,9 @@
 #ifndef	_GINT_H
 #define	_GINT_H	1
 
+#define	GINT_VERSION		0x01000000
+#define	GINT_VERSION_STR	"01.00"
+
 //---
 //	Interrupt handler control.
 //---
@@ -29,42 +32,6 @@ unsigned int gint_systemVBR(void);
 
 
 
-//---
-//	Callback API.
-//---
-
-/*
-	enum RTCFrequency
-	Describes the possible frequencies available for the real-time clock
-	interrupt.
-*/
-enum RTCFrequency
-{
-	RTCFreq_500mHz	= 7,
-	RTCFreq_1Hz	= 6,
-	RTCFreq_2Hz	= 5,
-	RTCFreq_4Hz	= 4,
-	RTCFreq_16Hz	= 3,
-	RTCFreq_64Hz	= 2,
-	RTCFreq_256Hz	= 1,
-};
-
-/*
-	gint_setRTCCallback()
-	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);
-
-/*
-	gint_getRTCCallback()
-	Returns the callback function. If frequency is non-NULL, it is set to
-	the current frequency value.
-*/
-void (*gint_getRTCCallback(enum RTCFrequency *frequency))(void);
-
-
-
 //---
 //	Internal API.
 //	Referenced here for documentation purposes only.
@@ -108,33 +75,86 @@ void gint_setup_7305(void);
 void gint_stop_7705(void);
 void gint_stop_7305(void);
 
+
+
+//---
+//	Exception handling.
+//---
+
 /*
-	gint()
+	gint_exc()
+	Handles exceptions.
+*/
+void gint_exc(void)		__attribute__((section(".gint.exc.entry"),
+					interrupt_handler));
+void gint_exc_7705(void)	__attribute__((section(".gint.exc")));
+void gint_exc_7305(void)	__attribute__((section(".gint.exc")));
+
+/*
+	gint_tlb()
+	Handles TLB misses.
+*/
+void gint_tlb(void)		__attribute__((section(".gint.tlb.entry"),
+					interrupt_handler));
+void gint_tlb_7705(void)	__attribute__((section(".gint.tlb")));
+void gint_tlb_7305(void)	__attribute__((section(".gint.tlb")));
+
+/*
+	gint_int()
 	Handles interrupts.
 */
-void gint(void)			__attribute__((section(".gint.int.entry"),
+void gint_int(void)		__attribute__((section(".gint.int.entry"),
 					interrupt_handler));
-void gint_7705(void)		__attribute__((section(".gint.int")));
-void gint_7305(void)		__attribute__((section(".gint.int")));
-
-/*
-	gint_setRTCFrequency()
-	Sets the RTC interrupt frequency and enables interrupts.
-*/
-void gint_setRTCFrequency_7705(enum RTCFrequency frequency);
-void gint_setRTCFrequency_7305(enum RTCFrequency frequency);
-
-/*
-	gint_getRTCFrequency()
-	Returns the RTC interrupt frequency.
-*/
-enum RTCFrequency gint_getRTCFrequency_7705(void);
-enum RTCFrequency gint_getRTCFrequency_7305(void);
+void gint_int_7705(void)	__attribute__((section(".gint.int")));
+void gint_int_7305(void)	__attribute__((section(".gint.int")));
 
 
 
 //---
-//	Internal priority definitions.
+//	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.
 //---
 
 #define	GINT_INTP_WDT	4
diff --git a/src/bopti/bopti_internals.h b/include/internals/bopti.h
similarity index 98%
rename from src/bopti/bopti_internals.h
rename to include/internals/bopti.h
index 1883613..3e0116c 100644
--- a/src/bopti/bopti_internals.h
+++ b/include/internals/bopti.h
@@ -14,8 +14,8 @@
 //
 //---
 
-#ifndef	_BOPTI_INTERNALS_H
-#define	_BOPTI_INTERNALS_H	1
+#ifndef	_INTERNALS_BOPTI_H
+#define	_INTERNALS_BOPTI_H	1
 
 #include <stdint.h>
 #include <display.h>
@@ -157,4 +157,4 @@ void bopti(const unsigned char *layer, struct Structure *s, struct Command *c);
 */
 void getStructure(struct Image *img, struct Structure *structure);
 
-#endif	// _BOPTI_INTERNALS_H
+#endif	// _INTERNALS_BOPTI_H
diff --git a/src/display/display_internals.h b/include/internals/display.h
similarity index 56%
rename from src/display/display_internals.h
rename to include/internals/display.h
index 560a0c8..a227edd 100644
--- a/src/display/display_internals.h
+++ b/include/internals/display.h
@@ -6,9 +6,9 @@
 //
 //---
 
-#ifndef	_DISPLAY_INTERNALS_H
-#define	_DISPLAY_INTERNALS_H
+#ifndef	_INTERNALS_DISPLAY_H
+#define	_INTERNALS_DISPLAY_H	1
 
 extern int *vram;
 
-#endif	// _DISPLAY_INTERNALS_H
+#endif	// _INTERNALS_DISPLAY_H
diff --git a/include/internals/gint.h b/include/internals/gint.h
new file mode 100644
index 0000000..4f038d2
--- /dev/null
+++ b/include/internals/gint.h
@@ -0,0 +1,30 @@
+#ifndef _INTERNALS_GINT_H
+#define	_INTERNALS_GINT_H	1
+
+//---
+//	Exception code strings.
+//---
+
+extern const char *gint_str[];
+
+
+
+//---
+//	Register access.
+//---
+
+/*
+	gint_spc()
+	Returns the saved program counter, which is the last state of execution
+	saved by interrupt processing.
+*/
+unsigned int gint_spc(void);
+
+/*
+	gint_ssr()
+	Returns the saved status register, which is the last configuration
+	saved by interrupt processing.
+*/
+unsigned int gint_ssr(void);
+
+#endif	// _INTERNALS_GINT_H
diff --git a/src/keyboard/keyboard_internals.h b/include/internals/keyboard.h
similarity index 88%
rename from src/keyboard/keyboard_internals.h
rename to include/internals/keyboard.h
index b08678b..3524f60 100644
--- a/src/keyboard/keyboard_internals.h
+++ b/include/internals/keyboard.h
@@ -1,5 +1,5 @@
-#ifndef	_KEYBOARD_INTERNALS_H
-#define	_KEYBOARD_INTERNALS_H	1
+#ifndef	_INTERNALS_KEYBOARD_H
+#define	_INTERNALS_KEYBOARD_H	1
 
 #include <keyboard.h>
 
@@ -31,4 +31,4 @@ int getPressedKey(volatile unsigned char *keyboard_state);
 int getPressedKeys(volatile unsigned char *keyboard_state, int *keys,
 	int count);
 
-#endif	// _KEYBOARD_INTERNALS_H
+#endif	// _INTERNALS_KEYBOARD_H
diff --git a/include/internals/mmu.h b/include/internals/mmu.h
new file mode 100644
index 0000000..23aa121
--- /dev/null
+++ b/include/internals/mmu.h
@@ -0,0 +1,21 @@
+//---
+//
+//	gint core module: mmu
+//
+//	A wise application should avoid tampering with the system's
+//	configuration of the MMU and the TLB. This module implicitly calls the
+//	system but does nothing by itself.
+//
+//---
+
+#ifndef	_MMU_H
+#define	_MMU_H	1
+
+/*
+	mmu_pseudoTLBInit()
+	Tries to have the system load enough data into TLB to allow add-in to
+	execute.
+*/
+void mmu_pseudoTLBInit(void);
+
+#endif	// _MMU_H
diff --git a/src/tales/tales_internals.h b/include/internals/tales.h
similarity index 93%
rename from src/tales/tales_internals.h
rename to include/internals/tales.h
index 4908aaf..5e101cd 100644
--- a/src/tales/tales_internals.h
+++ b/include/internals/tales.h
@@ -7,8 +7,8 @@
 //
 //---
 
-#ifndef	_TALES_INTERNALS_H
-#define	_TALES_INTERNALS_H	1
+#ifndef	_INTERNALS_TALES_H
+#define	_INTERNALS_TALES_H	1
 
 #include <tales.h>
 #include <stdint.h>
@@ -44,4 +44,4 @@ void operate(uint32_t *operators, int height, int x, int y);
 */
 int update(uint32_t *operators, int height, int available, uint32_t *glyph);
 
-#endif	// _TALES_INTERNALS_H
+#endif	// _INTERNALS_TALES_H
diff --git a/src/timer/timer_internals.h b/include/internals/timer.h
similarity index 90%
rename from src/timer/timer_internals.h
rename to include/internals/timer.h
index 4cc9e5d..b3334cc 100644
--- a/src/timer/timer_internals.h
+++ b/include/internals/timer.h
@@ -1,5 +1,5 @@
-#ifndef	_TIMER_INTERNALS_H
-#define	_TIMER_INTERNALS_H
+#ifndef	_INTERNALS_TIMER_H
+#define	_INTERNALS_TIMER_H	1
 
 /*
 	struct Timer
@@ -51,4 +51,4 @@ struct mod_tmu
 */
 void timer_get(int timer, struct mod_tmu **tmu, unsigned char **tstr);
 
-#endif	// _TIMER_INTERNALS_H
+#endif	// _INTERNALS_TIMER_H
diff --git a/include/rtc.h b/include/rtc.h
new file mode 100644
index 0000000..f1c6439
--- /dev/null
+++ b/include/rtc.h
@@ -0,0 +1,76 @@
+//---
+//
+//	gint core module: rtc
+//
+//	Manages RTC. This module is used behind standard module time.
+//
+//---
+
+#ifndef	_RTC_H
+#define	_RTC_H	1
+
+//---
+//	Callback API.
+//---
+
+/*
+	enum RTCFrequency
+	Describes the possible frequencies available for the real-time clock
+	interrupt.
+*/
+enum RTCFrequency
+{
+	RTCFreq_500mHz	= 7,
+	RTCFreq_1Hz	= 6,
+	RTCFreq_2Hz	= 5,
+	RTCFreq_4Hz	= 4,
+	RTCFreq_16Hz	= 3,
+	RTCFreq_64Hz	= 2,
+	RTCFreq_256Hz	= 1,
+};
+
+/*
+	rtc_setCallback()
+	Sets the callback function for the real-time clock interrupt. If
+	frequency is non-zero, the clock frequency is set to the given value.
+	Set the callback to NULL to deactivate an existing callback.
+*/
+void rtc_setCallback(void (*callback)(void), enum RTCFrequency frequency);
+
+/*
+	rtc_getCallback()
+	Returns the callback function. If frequency is non-NULL, it is set to
+	the current frequency value.
+*/
+void (*rtc_getCallback(enum RTCFrequency *frequency))(void);
+
+
+
+//---
+//	Internal API.
+//	Referenced here for documentation purposes only. Do not call.
+//---
+
+/*
+	rtc_interrupt()
+	Handles an RTC interrupt by calling the callback.
+*/
+void rtc_interrupt(void)		__attribute__((section(".gint.int")));
+void rtc_interrupt_7705(void)		__attribute__((section(".gint.int")));
+void rtc_interrupt_7305(void)		__attribute__((section(".gint.int")));
+
+/*
+	rtc_setFrequency()
+	Sets the RTC interrupt frequency and enables interrupts.
+*/
+void rtc_setFrequency_7705(enum RTCFrequency frequency);
+void rtc_setFrequency_7305(enum RTCFrequency frequency);
+
+/*
+	rtc_getFrequency()
+	Returns the RTC interrupt frequency.
+*/
+enum RTCFrequency rtc_getFrequency_7705(void);
+enum RTCFrequency rtc_getFrequency_7305(void);
+
+#endif	// _RTC_H
diff --git a/include/string.h b/include/string.h
index d5c96dc..e746347 100644
--- a/include/string.h
+++ b/include/string.h
@@ -8,7 +8,7 @@
 //---
 
 /*
-	memcpy()
+	memcpy()	O(byte_number)
 	Copies a memory area. The two areas must not overlap (if they do, use
 	memmove()). A smart copy is performed when possible. To enhance
 	performance, make sure than destination and source are both 4-aligned.
@@ -16,9 +16,21 @@
 void *memcpy(void *destination, const void *source, size_t byte_number);
 
 /*
-	memset()
+	memset()	O(byte_number)
 	Sets the contents of a memory area. A smart copy is performed.
 */
 void *memset(void *destination, int byte, size_t byte_number);
 
+
+
+//---
+//	String manipulation.
+//---
+
+/*
+	strlen()	O(length)
+	Returns the length of a string.
+*/
+size_t strlen(const char *str);
+
 #endif	// _STRING_H
diff --git a/include/tales.h b/include/tales.h
index 4013829..bb990b9 100644
--- a/include/tales.h
+++ b/include/tales.h
@@ -95,6 +95,12 @@ typedef struct Font Font;
 */
 void text_configure(struct Font *font);
 
+/*
+	text_configure_default()
+	Configures tales with the default font (which is part of gint).
+*/
+void text_configure_default(void)		__attribute__((constructor));
+
 /*
 	dtext()
 	Prints the given string, without any analysis.
diff --git a/libc.a b/libc.a
index 587b56e..6bdac15 100644
Binary files a/libc.a and b/libc.a differ
diff --git a/libgint.a b/libgint.a
index 30b9985..072c42e 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 90f3601..60caec1 100644
--- a/src/bopti/bopti_internals.c
+++ b/src/bopti/bopti_internals.c
@@ -1,4 +1,4 @@
-#include <bopti_internals.h>
+#include <internals/bopti.h>
 
 // Monochrome video ram, light and dark buffers (in this order).
 int *vram, *v1, *v2;
@@ -103,6 +103,7 @@ void bopti_grid(const uint32_t *layer, int column_count, int height,
 	const uint32_t *p1, *p2;
 	uint32_t l1, l2, operator;
 	int right_column, line;
+	int actual_column_count;
 
 	int vram_column_offset = (c->y << 2) + (c->x >> 5) + (c->x < 0);
 	int vram_offset = vram_column_offset;
@@ -117,12 +118,19 @@ void bopti_grid(const uint32_t *layer, int column_count, int height,
 	p1 = layer - height;
 	p2 = layer;
 
-	// We don't want to write the first vram column when x is negative.
+	// We don't want to write the first vram column when x is negative
+	// because it's outside the screen.
 	if(c->x < 0) p1 += height, p2 += height;
 	right_column = (c->x < 0);
+	// For the same reason, we don't to draw the additional rightmost
+	// column when it begins after 96.
+	if(c->x + (column_count << 5) > 128)
+		actual_column_count = column_count - 1;
+	else
+		actual_column_count = column_count;
 
 	// Drawing vram longwords, using pairs of columns.
-	while(right_column <= column_count)
+	while(right_column <= actual_column_count)
 	{
 		for(line = c->top; line < c->bottom; line++)
 		{
@@ -311,7 +319,7 @@ void getStructure(struct Image *img, struct Structure *s)
 	}
 
 	// The layer size must be rounded to a multiple of 4.
-	layer = img->height * ((column_count << 2) + end_bytes);
+	layer = s->height * ((column_count << 2) + end_bytes);
 	if(layer & 3) layer += 4 - (layer & 3);
 
 	s->columns	= column_count;
diff --git a/src/bopti/dimage.c b/src/bopti/dimage.c
index 3da393f..8c2f5f9 100644
--- a/src/bopti/dimage.c
+++ b/src/bopti/dimage.c
@@ -1,4 +1,4 @@
-#include <bopti_internals.h>
+#include <internals/bopti.h>
 #include <display.h>
 
 /*
@@ -29,11 +29,10 @@ void dimage(struct Image *img, int x, int y)
 	actual_width	= (x + s.width > 128) ? (128 - x) : (s.width);
 	command.right	= ((actual_width + 31) >> 5) - 1;
 
-	command.x	= x;
-	command.y	= y;
 	command.op	= bopti_op_mono;
 
-	getMasks(x, x + actual_width - 1, command.masks);
+	if(x >= 0) getMasks(x, x + actual_width - 1, command.masks);
+	else getMasks(0, actual_width + x - 1, command.masks);
 
 	vram = display_getCurrentVRAM();
 
@@ -42,7 +41,11 @@ void dimage(struct Image *img, int x, int y)
 		// Drawing every layer, in order of formats.
 		if(format & 1)
 		{
+			// These members are modified by bopti()!
+			command.x	= x;
+			command.y	= y;
 			command.channel = (1 << i);
+
 			bopti(s.data, &s, &command);
 			s.data += s.layer_size;
 		}
diff --git a/src/bopti/gimage.c b/src/bopti/gimage.c
index dd31143..65e0ed3 100644
--- a/src/bopti/gimage.c
+++ b/src/bopti/gimage.c
@@ -1,4 +1,4 @@
-#include <bopti_internals.h>
+#include <internals/bopti.h>
 #include <display.h>
 #include <gray.h>
 
@@ -20,7 +20,7 @@ void gimage(struct Image *img, int x, int y)
 	//---
 	//	Adjusting image parameters.
 	//---
-//-65:-68
+
 	if(x + s.width < 0 || x > 127 || y + s.height < 0 || y > 63) return;
 
 	command.top	= (y < 0) ? (-y) : (0);
@@ -54,5 +54,4 @@ void gimage(struct Image *img, int x, int y)
 		format >>= 1;
 		i++;
 	}
-
 }
diff --git a/src/core/crt0.c b/src/core/crt0.c
index 3bb31da..1643e05 100644
--- a/src/core/crt0.c
+++ b/src/core/crt0.c
@@ -1,8 +1,10 @@
 #include <stdlib.h>
-#include <gint.h>
 #include <string.h>
 #include <setjmp.h>
 
+#include <gint.h>
+#include <internals/mmu.h>
+
 void	__Hmem_SetMMU(unsigned int, unsigned int, int);
 void	__GLibAddinAplExecutionCheck(int, int, int);
 int	main(void);
@@ -42,9 +44,6 @@ int start(void)
 	unsigned int *data = &bdata, *src = &romdata;
 	int x;
 
-	// Setting up the TLB.
-	__Hmem_SetMMU(0x08102000, 0x8801e000, 108);
-
 	// Clearing the .bss section.
 	while(bss < &ebss) *bss++ = 0;
 	// Copying the .data section.
@@ -52,6 +51,8 @@ int start(void)
 
 	__GLibAddinAplExecutionCheck(0, 1, 1);
 
+	mmu_pseudoTLBInit();
+
 	// Initializing everything.
 	gint_init();
 	init();
diff --git a/src/core/gint.c b/src/core/gint.c
index d6098e0..ec5f526 100644
--- a/src/core/gint.c
+++ b/src/core/gint.c
@@ -7,6 +7,7 @@
 //
 //---
 
+#include <internals/gint.h>
 #include <gint.h>
 #include <mpu.h>
 #include <stddef.h>
@@ -63,18 +64,6 @@ inline unsigned int gint_systemVBR(void)
 	return sys_vbr;
 }
 
-/*
-	gint()
-	Handles interrupts.
-*/
-void gint(void)
-{
-	if(isSH3())
-		gint_7705();
-	else
-		gint_7305();
-}
-
 /*
 	gint_init()
 	Initializes gint. Loads the interrupt handler into the memory and sets
@@ -113,3 +102,145 @@ void gint_quit(void)
 {
 	gint_setVBR(sys_vbr, gint_stop);
 }
+
+
+
+//---
+//	VBR space.
+//---
+
+#include <display.h>
+#define print(str, x, y) dtext(str, 6 * (x) - 5, 8 * (y) - 7)
+#define hexdigit(n) ((n) + '0' + 39 * ((n) > 9))
+
+void hex(unsigned int x, int digits, char *str)
+{
+	str[0] = '0';
+	str[1] = 'x';
+	str[digits + 2] = 0;
+
+	while(digits)
+	{
+		str[digits + 1] = hexdigit(x & 0xf);
+		x >>= 4;
+		digits--;
+	}
+}
+
+/*
+	gint_exc()
+	Handles exceptions.
+*/
+void gint_exc(void)
+{
+	volatile unsigned int *expevt	= gint_reg(Register_EXPEVT);
+	volatile unsigned int *tea	= gint_reg(Register_TEA);
+	unsigned int spc;
+	char str[11];
+
+	text_configure_default();
+
+	__asm__("\tstc spc, %0" : "=r"(spc));
+
+	dclear();
+	print("Exception raised!", 3, 1);
+	dreverse_area(0, 0, 127, 8);
+	print(gint_strerror(0), 2, 3);
+
+	print("expevt", 2, 4);
+	hex(*expevt, 3, str);
+	print(str, 16, 4);
+
+	print("pc", 2, 5);
+	hex(spc, 8, str);
+	print(str, 11, 5);
+
+	print("tea", 2, 6);
+	hex(*tea, 8, str);
+	print(str, 11, 6);
+
+	print("Please reset.", 2, 7);
+	dupdate();
+	while(1);
+}
+
+/*
+	gint_tlb()
+	Handles TLB misses.
+*/
+void gint_tlb(void)
+{
+	volatile unsigned int *expevt	= gint_reg(Register_EXPEVT);
+	volatile unsigned int *tea	= gint_reg(Register_TEA);
+	unsigned int spc;
+	char str[11];
+
+	text_configure_default();
+
+	__asm__("\tstc spc, %0" : "=r"(spc));
+
+	dclear();
+	print("TLB error!", 6, 1);
+	dreverse_area(0, 0, 127, 8);
+	print(gint_strerror(1), 2, 3);
+
+	print("expevt", 2, 4);
+	hex(*expevt, 3, str);
+	print(str, 16, 4);
+
+	print("pc", 2, 5);
+	hex(spc, 8, str);
+	print(str, 11, 5);
+
+	print("tea", 2, 6);
+	hex(*tea, 8, str);
+	print(str, 11, 6);
+
+	print("Please reset.", 2, 7);
+	dupdate();
+	while(1);
+}
+
+/*
+	gint_int()
+	Handles interrupts.
+*/
+void gint_int(void)
+{
+	if(isSH3())
+		gint_int_7705();
+	else
+		gint_int_7305();
+}
+
+/*
+	gint_reg()
+	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).
+*/
+inline volatile void *gint_reg(enum Register reg)
+{
+	if(isSH3())
+		return gint_reg_7705(reg);
+	else
+		return gint_reg_7305(reg);
+}
+
+/*
+	gint_strerror()
+	Returns a string that describe the error set in EXPEVT. This string is
+	not platform-dependent.
+	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)
+{
+	if(isSH3())
+		return gint_strerror_7705(is_tlb);
+	else
+		return gint_strerror_7305(is_tlb);
+}
diff --git a/src/core/gint_str.c b/src/core/gint_str.c
new file mode 100644
index 0000000..c7e9957
--- /dev/null
+++ b/src/core/gint_str.c
@@ -0,0 +1,37 @@
+#include <internals/gint.h>
+
+const char *gint_str[] = {
+	"Unknown",
+
+	// User breaks.
+	"User break (before)",
+	"User break (after)",
+	"User breakpoint",
+
+	// General.
+	"Inst. address error",
+	"Data access error",
+	"Illegal instruction",
+	"Illegal slot",
+	"Data address (r)",
+	"Data address (w)",
+
+	// Instruction TLB.
+	"Inst. TLB miss",
+	"Inst. TLB invalid",
+	"Inst. TLB protect.",
+
+	// Data TLB.
+	"Data TLB miss",
+	"Data TLB miss (r)",
+	"Data TLB miss (w)",
+	"Data TLB protection",
+	"Data TLB prot. (r)",
+	"Data TLB prot. (w)",
+	"Data TLB invalid",
+
+	// Others.
+	"Initial page write",
+	"Trap",
+	"DMA address error",
+};
diff --git a/src/core/syscalls.s b/src/core/syscalls.s
index 5e67fa9..ca5397f 100644
--- a/src/core/syscalls.s
+++ b/src/core/syscalls.s
@@ -1,11 +1,10 @@
 /*
 	gint core module: syscalls
 
-	All the system calls used by the library. Let's hope one day we won't
-	depend on them anymore.
+	All the system calls used by the library. Somehow "the less, the
+	better".
 */
 
-	.global	___Hmem_SetMMU
 	.global	___GLibAddinAplExecutionCheck
 	.global	_malloc
 	.global	_calloc
@@ -13,13 +12,6 @@
 
 
 
-___Hmem_SetMMU:
-	mov.l	syscall_table, r2
-	mov.l	1f, r0
-	jmp	@r2
-	nop
-1:	.long	0x3fa
-
 ___GLibAddinAplExecutionCheck:
 	mov.l	syscall_table, r2
 	mov	#0x13, r0
diff --git a/src/display/adjustRectangle.c b/src/display/adjustRectangle.c
index 3b5b237..a865e4f 100644
--- a/src/display/adjustRectangle.c
+++ b/src/display/adjustRectangle.c
@@ -1,4 +1,4 @@
-#include <display_internals.h>
+#include <internals/display.h>
 
 /*
 	adjustRectangle()
diff --git a/src/display/dclear.c b/src/display/dclear.c
index d33503b..ed45a6d 100644
--- a/src/display/dclear.c
+++ b/src/display/dclear.c
@@ -1,4 +1,4 @@
-#include <display_internals.h>
+#include <internals/display.h>
 #include <display.h>
 
 /*
diff --git a/src/display/dclear_area.c b/src/display/dclear_area.c
index 2648178..a8755c5 100644
--- a/src/display/dclear_area.c
+++ b/src/display/dclear_area.c
@@ -1,4 +1,4 @@
-#include <display_internals.h>
+#include <internals/display.h>
 #include <display.h>
 
 /*
diff --git a/src/display/dline.c b/src/display/dline.c
index 69e331d..7a76173 100644
--- a/src/display/dline.c
+++ b/src/display/dline.c
@@ -1,4 +1,4 @@
-#include <display_internals.h>
+#include <internals/display.h>
 #include <display.h>
 
 #define sgn(x)	((x) < 0 ? -1 : 1)
diff --git a/src/display/dpixel.c b/src/display/dpixel.c
index c5bfb9a..60c3a06 100644
--- a/src/display/dpixel.c
+++ b/src/display/dpixel.c
@@ -1,4 +1,4 @@
-#include <display_internals.h>
+#include <internals/display.h>
 #include <display.h>
 
 /*
diff --git a/src/display/dreverse_area.c b/src/display/dreverse_area.c
index c9eeaee..286f221 100644
--- a/src/display/dreverse_area.c
+++ b/src/display/dreverse_area.c
@@ -1,4 +1,4 @@
-#include <display_internals.h>
+#include <internals/display.h>
 #include <display.h>
 
 /*
diff --git a/src/display/dupdate.c b/src/display/dupdate.c
index 6942c60..6ca42f8 100644
--- a/src/display/dupdate.c
+++ b/src/display/dupdate.c
@@ -1,4 +1,4 @@
-#include <display_internals.h>
+#include <internals/display.h>
 #include <display.h>
 #include <screen.h>
 #include <gray.h>
diff --git a/src/display/font_system.bmp b/src/display/font_system.bmp
new file mode 100644
index 0000000..e866558
Binary files /dev/null and b/src/display/font_system.bmp differ
diff --git a/src/keyboard/getPressedKey.c b/src/keyboard/getPressedKey.c
index 5e53a01..ca8ba32 100644
--- a/src/keyboard/getPressedKey.c
+++ b/src/keyboard/getPressedKey.c
@@ -1,4 +1,4 @@
-#include <keyboard_internals.h>
+#include <internals/keyboard.h>
 
 /*
 	getPressedKey()
diff --git a/src/keyboard/getPressedKeys.c b/src/keyboard/getPressedKeys.c
index 20f52dc..b6dd739 100644
--- a/src/keyboard/getPressedKeys.c
+++ b/src/keyboard/getPressedKeys.c
@@ -1,4 +1,4 @@
-#include <keyboard_internals.h>
+#include <internals/keyboard.h>
 
 /*
 	getPressedKeys()
diff --git a/src/keyboard/getkey.c b/src/keyboard/getkey.c
index faf9853..2cfc156 100644
--- a/src/keyboard/getkey.c
+++ b/src/keyboard/getkey.c
@@ -1,5 +1,5 @@
+#include <internals/keyboard.h>
 #include <keyboard.h>
-#include <keyboard_internals.h>
 
 /*
 	getkey()
diff --git a/src/keyboard/keyboard_config.c b/src/keyboard/keyboard_config.c
index 909952d..f3a9361 100644
--- a/src/keyboard/keyboard_config.c
+++ b/src/keyboard/keyboard_config.c
@@ -1,5 +1,5 @@
+#include <internals/keyboard.h>
 #include <keyboard.h>
-#include <keyboard_internals.h>
 
 /*
 	keyboard_setFrequency()
diff --git a/src/keyboard/keyboard_interrupt.c b/src/keyboard/keyboard_interrupt.c
index e76aca1..4273445 100644
--- a/src/keyboard/keyboard_interrupt.c
+++ b/src/keyboard/keyboard_interrupt.c
@@ -2,7 +2,7 @@
 #include <timer.h>
 #include <mpu.h>
 
-#include <keyboard_internals.h>
+#include <internals/keyboard.h>
 
 //---
 //	Keyboard variables.
diff --git a/src/keyboard/keyboard_misc.c b/src/keyboard/keyboard_misc.c
index 4837c8b..abdf59c 100644
--- a/src/keyboard/keyboard_misc.c
+++ b/src/keyboard/keyboard_misc.c
@@ -1,5 +1,5 @@
 #include <keyboard.h>
-#include <keyboard_internals.h>
+#include <internals/keyboard.h>
 
 /*
 	keylast()
diff --git a/src/keyboard/multigetkey.c b/src/keyboard/multigetkey.c
index fb7d355..dbe8a44 100644
--- a/src/keyboard/multigetkey.c
+++ b/src/keyboard/multigetkey.c
@@ -1,5 +1,5 @@
 #include <keyboard.h>
-#include <keyboard_internals.h>
+#include <internals/keyboard.h>
 
 /*
 	multigetkey()
diff --git a/src/keyboard/sleep.c b/src/keyboard/sleep.c
index 92ae174..8e71e84 100644
--- a/src/keyboard/sleep.c
+++ b/src/keyboard/sleep.c
@@ -1,4 +1,4 @@
-#include <keyboard_internals.h>
+#include <internals/keyboard.h>
 
 /*
 	sleep()
diff --git a/src/mmu/pseudoTLBInit.c b/src/mmu/pseudoTLBInit.c
new file mode 100644
index 0000000..d9e827b
--- /dev/null
+++ b/src/mmu/pseudoTLBInit.c
@@ -0,0 +1,25 @@
+#include <internals/mmu.h>
+
+/*
+	mmu_pseudoTLBInit()
+	We need the system to fill the TLB for us, so that it knows what
+	happens to its contents. We don't want to edit the TLB ourselves, so
+	we'll just read random data from every 4k-page in the rom area to have
+	the system virtualize it entirely.
+	The index system for TLB entries ensures this process will work for
+	128-k or less add-ins. On SH7705 there is a limit, which is 384-k (it
+	does probably not exist on SH7305) but there is no guarantee that the
+	system will not go wild after 128-k.
+*/
+void mmu_pseudoTLBInit(void)
+{
+	extern unsigned int romdata;
+	unsigned int address = 0x00300000;
+	unsigned int x;
+
+	while(address <= (unsigned int)&romdata)
+	{
+		x = *((volatile unsigned int *)address);
+		address += 0x1000;
+	}
+}
diff --git a/src/mpu/gint_sh7305.c b/src/mpu/gint_sh7305.c
index f5e8c85..03570b3 100644
--- a/src/mpu/gint_sh7305.c
+++ b/src/mpu/gint_sh7305.c
@@ -8,9 +8,13 @@
 //
 //---
 
+#include <internals/gint.h>
 #include <gint.h>
 #include <timer.h>
 #include <7305.h>
+#include <rtc.h>
+
+#include <stddef.h>
 
 //---
 //	Interrupt codes.
@@ -25,10 +29,10 @@
 
 
 //---
-//	Interrupt handler.
+//	Exception handling.
 //---
 
-void gint_7305(void)
+void gint_int_7305(void)
 {
 	volatile unsigned int *intevt  = (unsigned int *)0xff000028;
 	unsigned int code = *intevt;
@@ -36,7 +40,7 @@ void gint_7305(void)
 	switch(code)
 	{
 	case IC_RTC_PRI:
-		RTC.RCR2.PEF = 0;
+		rtc_interrupt();
 		break;
 
 	case IC_TMU0_TUNI0:
@@ -53,6 +57,58 @@ void gint_7305(void)
 	}
 }
 
+/*
+	gint_reg()
+	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_7305(enum Register reg)
+{
+	volatile unsigned int *expevt	= (unsigned int *)0xff000024;
+	volatile unsigned int *tea	= (unsigned int *)0xff00000c;
+	volatile unsigned int *mmucr	= (unsigned int *)0xff000010;
+
+	switch(reg)
+	{
+	case Register_EXPEVT:	return expevt;
+	case Register_TEA:	return tea;
+	case Register_MMUCR:	return mmucr;
+	default:		return NULL;
+	}
+}
+
+/*
+	gint_strerror()
+	Returns a string that describe the error set in EXPEVT. This string is
+	not platform-dependent.
+	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_7305(int is_tlb)
+{
+	volatile unsigned int *expevt = gint_reg_7305(Register_EXPEVT);
+
+	switch(*expevt)
+	{
+	case 0x1e0: return gint_str[3];
+	case 0x0e0: return gint_str[8];
+	case 0x040: return gint_str[14];
+	case 0x0a0: return gint_str[17];
+	case 0x180: return gint_str[6];
+	case 0x1a0: return gint_str[7];
+	case 0x100: return gint_str[9];
+	case 0x060: return gint_str[15];
+	case 0x0c0: return gint_str[18];
+	case 0x080: return gint_str[20];
+	case 0x160: return gint_str[21];
+	}
+	return gint_str[0];
+}
+
 
 
 //---
diff --git a/src/mpu/gint_sh7705.c b/src/mpu/gint_sh7705.c
index f17aafb..61a0e2e 100644
--- a/src/mpu/gint_sh7705.c
+++ b/src/mpu/gint_sh7705.c
@@ -8,9 +8,13 @@
 //
 //---
 
+#include <internals/gint.h>
 #include <gint.h>
 #include <timer.h>
 #include <7705.h>
+#include <rtc.h>
+
+#include <stddef.h>
 
 //---
 //	Interrupt codes.
@@ -25,10 +29,10 @@
 
 
 //---
-//	Interrupt handler.
+//	Exception handling.
 //---
 
-void gint_7705(void)
+void gint_int_7705(void)
 {
 	volatile unsigned int *intevt2 = (unsigned int *)0xa4000000;
 	unsigned int code = *intevt2;
@@ -36,7 +40,7 @@ void gint_7705(void)
 	switch(code)
 	{
 	case IC_RTC_PRI:
-		RTC.RCR2.BIT.PEF = 0;
+		rtc_interrupt();
 		break;
 
 	case IC_TMU0_TUNI0:
@@ -53,6 +57,59 @@ void gint_7705(void)
 	}
 }
 
+/*
+	gint_reg()
+	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_7705(enum Register reg)
+{
+	volatile unsigned int *expevt	= (unsigned int *)0xffffffd4;
+	volatile unsigned int *mmucr	= (unsigned int *)0xfffffff4;
+	volatile unsigned int *tea	= (unsigned int *)0xfffffffc;
+
+	switch(reg)
+	{
+	case Register_EXPEVT:	return expevt;
+	case Register_MMUCR:	return mmucr;
+	case Register_TEA:	return tea;
+	default:		return NULL;
+	}
+}
+
+/*
+	gint_strerror()
+	Returns a string that describe the error set in EXPEVT. This string is
+	not platform-dependent.
+	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_7705(int is_tlb)
+{
+	volatile unsigned int *expevt = gint_reg_7705(Register_EXPEVT);
+
+	switch(*expevt)
+	{
+	case 0x1e0: return gint_str[3];
+	case 0x0e0: return gint_str[4];
+	case 0x040: return gint_str[is_tlb ? 10 : 11];
+	case 0x0a0: return gint_str[12];
+	case 0x180: return gint_str[6];
+	case 0x1a0: return gint_str[7];
+	case 0x100: return gint_str[5];
+	case 0x060: return gint_str[is_tlb ? 13 : 19];
+	case 0x0c0: return gint_str[16];
+	case 0x080: return gint_str[20];
+	case 0x160: return gint_str[21];
+	case 0x5c0: return gint_str[22];
+	}
+	return gint_str[0];
+}
+
 
 
 //---
diff --git a/src/mpu/various_7305.c b/src/mpu/rtc_7305.c
similarity index 51%
rename from src/mpu/various_7305.c
rename to src/mpu/rtc_7305.c
index 6182968..89d8cbd 100644
--- a/src/mpu/various_7305.c
+++ b/src/mpu/rtc_7305.c
@@ -1,27 +1,34 @@
-#include <gint.h>
-#include <timer.h>
-#include <keyboard.h>
 #include <7305.h>
+#include <rtc.h>
 
 //---
 //	Various MPU-dependent procedures.
 //---
 
 /*
-	gint_setRTCFrequency()
+	rtc_setFrequency()
 	Sets the RTC interrupt frequency and enables interrupts.
 */
-void gint_setRTCFrequency_7305(enum RTCFrequency frequency)
+void rtc_setFrequency_7305(enum RTCFrequency frequency)
 {
 	if(frequency < 1 || frequency > 7) return;
 	RTC.RCR2.BYTE = (frequency << 4) | 0x09;
 }
 
 /*
-	gint_getRTCFrequency()
+	rtc_getFrequency()
 	Returns the RTC interrupt frequency.
 */
-enum RTCFrequency gint_getRTCFrequency_7305(void)
+enum RTCFrequency rtc_getFrequency_7305(void)
 {
 	return (RTC.RCR2.BYTE & 0x70) >> 4;
 }
+
+/*
+	rtc_interrupt()
+	Handles an RTC interrupt by calling the callback.
+*/
+void rtc_interrupt_7305(void)
+{
+	RTC.RCR2.PEF = 0;
+}
diff --git a/src/mpu/various_7705.c b/src/mpu/rtc_7705.c
similarity index 51%
rename from src/mpu/various_7705.c
rename to src/mpu/rtc_7705.c
index c046813..b677bc2 100644
--- a/src/mpu/various_7705.c
+++ b/src/mpu/rtc_7705.c
@@ -1,27 +1,34 @@
-#include <gint.h>
-#include <timer.h>
-#include <keyboard.h>
 #include <7705.h>
+#include <rtc.h>
 
 //---
 //	Various MPU-dependent procedures.
 //---
 
 /*
-	gint_setRTCFrequency()
+	rtc_setFrequency()
 	Sets the RTC interrupt frequency and enables interrupts.
 */
-void gint_setRTCFrequency_7705(enum RTCFrequency frequency)
+void rtc_setFrequency_7705(enum RTCFrequency frequency)
 {
 	if(frequency < 1 || frequency > 7) return;
 	RTC.RCR2.BYTE = (frequency << 4) | 0x09;
 }
 
 /*
-	gint_getRTCFrequency()
+	rtc_getFrequency()
 	Returns the RTC interrupt frequency.
 */
-enum RTCFrequency gint_getRTCFrequency_7705(void)
+enum RTCFrequency rtc_getFrequency_7705(void)
 {
 	return (RTC.RCR2.BYTE & 0x70) >> 4;
 }
+
+/*
+	rtc_interrupt()
+	Handles an RTC interrupt by calling the callback.
+*/
+void rtc_interrupt_7705(void)
+{
+	RTC.RCR2.BIT.PEF = 0;
+}
diff --git a/src/core/gint_callback.c b/src/rtc/rtc_interrupt.c
similarity index 57%
rename from src/core/gint_callback.c
rename to src/rtc/rtc_interrupt.c
index d9d1ee7..a606a45 100644
--- a/src/core/gint_callback.c
+++ b/src/rtc/rtc_interrupt.c
@@ -1,31 +1,32 @@
-#include <gint.h>
+#include <rtc.h>
 #include <mpu.h>
 
 #include <stddef.h>
 
 static void (*rtc_callback)(void) = NULL;
 
+//---
+//	Callback API.
+//---
+
 /*
-	gint_setRTCCallback()
+	rtc_setCallback()
 	Sets the callback function for the real-time clock interrupt. If
 	frequency is non-NULL, the clock frequency is set to the given value.
-
-	@arg	callback	Callback function.
-	@arg	frequency	Interrupt frequency.
 */
 void gint_setRTCCallback(void (*callback)(void), enum RTCFrequency frequency)
 {
-	if(frequency < 1 || frequency > 7) return;
 	rtc_callback = callback;
+	if(frequency < 1 || frequency > 7) return;
 
 	if(isSH3())
-		gint_setRTCFrequency_7705(frequency);
+		rtc_setFrequency_7705(frequency);
 	else
-		gint_setRTCFrequency_7305(frequency);
+		rtc_setFrequency_7305(frequency);
 }
 
 /*
-	gint_getRTCCallback()
+	rtc_getCallback()
 	Returns the callback function. If frequency is non-NULL, it is set to
 	the current frequency value.
 */
@@ -34,9 +35,29 @@ void (*gint_getRTCCallback(enum RTCFrequency *frequency))(void)
 	if(!frequency) return rtc_callback;
 
 	if(isSH3())
-		*frequency = gint_getRTCFrequency_7705();
+		*frequency = rtc_getFrequency_7705();
 	else
-		*frequency = gint_getRTCFrequency_7305();
+		*frequency = rtc_getFrequency_7305();
 
 	return rtc_callback;
 }
+
+
+
+//---
+//	Interrupt management.
+//---
+
+/*
+	rtc_interrupt()
+	Handles an RTC interrupt by calling the callback.
+*/
+void rtc_interrupt(void)
+{
+	if(rtc_callback) (*rtc_callback)();
+
+	if(isSH3())
+		rtc_interrupt_7705();
+	else
+		rtc_interrupt_7305();
+}
diff --git a/src/string/strlen.c b/src/string/strlen.c
new file mode 100644
index 0000000..7b5a9a1
--- /dev/null
+++ b/src/string/strlen.c
@@ -0,0 +1,12 @@
+#include <string.h>
+
+/*
+	strlen()
+	Returns the length of a string.
+*/
+size_t strlen(const char *str)
+{
+	int len = 0;
+	while(str[len]) len++;
+	return len;
+}
diff --git a/src/tales/dtext.c b/src/tales/dtext.c
index 7f52aaa..6d44e2b 100644
--- a/src/tales/dtext.c
+++ b/src/tales/dtext.c
@@ -1,8 +1,9 @@
-#include <tales_internals.h>
+#include <internals/tales.h>
 #include <tales.h>
 
 #include <stdlib.h>
 #include <string.h>
+#include <alloca.h>
 
 /*
 	dtext()
@@ -24,6 +25,8 @@ void dtext(const char *str, int x, int y)
 	// format requires it: it allows greater optimization.
 	int height;
 
+	int i;
+
 
 
 	if(!font) return;
@@ -32,7 +35,8 @@ void dtext(const char *str, int x, int y)
 	height = font->data_height;
 	if(x > 127 || y > 63 || y <= -height) return;
 
-	operators = calloc(height, sizeof(uint32_t));
+	operators = alloca(height * sizeof(uint32_t));
+	for(i = 0; i < height; i++) operators[i] = 0;
 	if(!operators) return;
 
 	// Computing the initial operator offset to have 32-aligned operators.
@@ -84,5 +88,5 @@ void dtext(const char *str, int x, int y)
 	// Final operation.
 	if(x <= 96 && available < 32) operate(operators, height, x, y);
 
-	free(operators);
+//	free(operators);
 }
diff --git a/src/tales/tales_configuration.c b/src/tales/tales_configuration.c
index eb2aefa..394dd0f 100644
--- a/src/tales/tales_configuration.c
+++ b/src/tales/tales_configuration.c
@@ -1,4 +1,4 @@
-#include <tales_internals.h>
+#include <internals/tales.h>
 #include <tales.h>
 
 /*
@@ -9,3 +9,13 @@ void text_configure(struct Font *next_font)
 {
 	font = next_font;
 }
+
+/*
+	text_configure_default()
+	Configures tales with the default font (which is part of gint).
+*/
+void text_configure_default(void)
+{
+	extern Font gint_font_system_start;
+	text_configure(&gint_font_system_start);
+}
diff --git a/src/tales/tales_internals.c b/src/tales/tales_internals.c
index 8470254..7e29d3f 100644
--- a/src/tales/tales_internals.c
+++ b/src/tales/tales_internals.c
@@ -1,4 +1,4 @@
-#include <tales_internals.h>
+#include <internals/tales.h>
 #include <ctype.h>
 
 struct Font *font;
diff --git a/src/timer/timer_get.c b/src/timer/timer_get.c
index c3ab7f0..0d4b5cb 100644
--- a/src/timer/timer_get.c
+++ b/src/timer/timer_get.c
@@ -1,4 +1,4 @@
-#include <timer_internals.h>
+#include <internals/timer.h>
 #include <mpu.h>
 
 /*
diff --git a/src/timer/timer_interrupt.c b/src/timer/timer_interrupt.c
index 5af1d6c..aea22bf 100644
--- a/src/timer/timer_interrupt.c
+++ b/src/timer/timer_interrupt.c
@@ -1,5 +1,5 @@
+#include <internals/timer.h>
 #include <timer.h>
-#include <timer_internals.h>
 
 #include <stddef.h>
 
diff --git a/src/timer/timer_reload.c b/src/timer/timer_reload.c
index 6d9112c..3b725e0 100644
--- a/src/timer/timer_reload.c
+++ b/src/timer/timer_reload.c
@@ -1,5 +1,5 @@
+#include <internals/timer.h>
 #include <timer.h>
-#include <timer_internals.h>
 
 /*
 	timer_reload()
diff --git a/src/timer/timer_start.c b/src/timer/timer_start.c
index f753e5d..c320edf 100644
--- a/src/timer/timer_start.c
+++ b/src/timer/timer_start.c
@@ -1,5 +1,5 @@
+#include <internals/timer.h>
 #include <timer.h>
-#include <timer_internals.h>
 
 /*
 	timer_start()
diff --git a/src/timer/timer_stop.c b/src/timer/timer_stop.c
index 1c77d5a..8d8d860 100644
--- a/src/timer/timer_stop.c
+++ b/src/timer/timer_stop.c
@@ -1,5 +1,5 @@
+#include <internals/timer.h>
 #include <timer.h>
-#include <timer_internals.h>
 
 #include <stddef.h>