diff --git a/src/console.c b/src/console.c
index 0467f46..4899052 100644
--- a/src/console.c
+++ b/src/console.c
@@ -357,15 +357,16 @@ static bool onConsoleLoadSectionCommand(Console* console, const char* param)
 						loadCart(console->tic, cart, data, size, true);
 						tic_mem* tic = console->tic;
 
+						// TODO: should load to the currena bank
 						switch(i)
 						{
-						case 0: memcpy(&tic->cart.tiles, 		&cart->tiles, 		sizeof cart->tiles + sizeof cart->sprites); break;
-						case 1: memcpy(&tic->cart.map, 			&cart->map, 		sizeof cart->map); break;
-						case 2: memcpy(&tic->cart.cover, 		&cart->cover, 		sizeof cart->cover); break;
-						case 3: memcpy(&tic->cart.code, 		&cart->code, 		sizeof cart->code); break;
-						case 4: memcpy(&tic->cart.sfx, 			&cart->sfx, 		sizeof cart->sfx); break;
-						case 5: memcpy(&tic->cart.music, 		&cart->music, 		sizeof cart->music); break;
-						case 6: memcpy(&tic->cart.palette, 		&cart->palette, 	sizeof cart->palette); break;
+						case 0: memcpy(&tic->cart.banks[0].tiles, 	&cart->banks[0].tiles, 	sizeof(tic_tiles)*2); break;
+						case 1: memcpy(&tic->cart.banks[0].map, 	&cart->banks[0].map, 	sizeof(tic_map)); break;
+						case 2: memcpy(&tic->cart.cover, 			&cart->cover, 			sizeof cart->cover); break;
+						case 3: memcpy(&tic->cart.code, 			&cart->code, 			sizeof cart->code); break;
+						case 4: memcpy(&tic->cart.banks[0].sfx, 	&cart->banks[0].sfx, 	sizeof(tic_sfx)); break;
+						case 5: memcpy(&tic->cart.banks[0].music, 	&cart->banks[0].music, 	sizeof(tic_music)); break;
+						case 6: memcpy(&tic->cart.palette, 			&cart->palette, 		sizeof(tic_palette)); break;
 						}
 
 						studioRomLoaded();
@@ -602,14 +603,15 @@ static char* saveBinarySection(char* ptr, const char* comment, const char* tag,
 typedef struct {char* tag; s32 count; s32 offset; s32 size; bool flip;} BinarySection;
 static const BinarySection BinarySections[] = 
 {
+	// TODO: fix banks loading here
 	{"PALETTE", 	1, offsetof(tic_cartridge, palette.data), sizeof(tic_palette), false},
-	{"TILES", 		TIC_BANK_SPRITES, offsetof(tic_cartridge, tiles), sizeof(tic_tile), true},
-	{"SPRITES", 	TIC_BANK_SPRITES, offsetof(tic_cartridge, sprites), sizeof(tic_tile), true},
-	{"MAP", 		TIC_MAP_HEIGHT, offsetof(tic_cartridge, map), TIC_MAP_WIDTH, true},
-	{"WAVES", 		ENVELOPES_COUNT, offsetof(tic_cartridge, sfx.waveform.envelopes), sizeof(tic_waveform), true},
-	{"SFX", 		SFX_COUNT, offsetof(tic_cartridge, sfx.data), sizeof(tic_sound_effect), true},
-	{"PATTERNS", 	MUSIC_PATTERNS, offsetof(tic_cartridge, music.patterns), sizeof(tic_track_pattern), true},
-	{"TRACKS", 		MUSIC_TRACKS, offsetof(tic_cartridge, music.tracks), sizeof(tic_track), true},
+	{"TILES", 		TIC_BANK_SPRITES, offsetof(tic_cartridge, banks->tiles), sizeof(tic_tile), true},
+	{"SPRITES", 	TIC_BANK_SPRITES, offsetof(tic_cartridge, banks->sprites), sizeof(tic_tile), true},
+	{"MAP", 		TIC_MAP_HEIGHT, offsetof(tic_cartridge, banks->map), TIC_MAP_WIDTH, true},
+	{"WAVES", 		ENVELOPES_COUNT, offsetof(tic_cartridge, banks->sfx.waveform.envelopes), sizeof(tic_waveform), true},
+	{"SFX", 		SFX_COUNT, offsetof(tic_cartridge, banks->sfx.data), sizeof(tic_sound_effect), true},
+	{"PATTERNS", 	MUSIC_PATTERNS, offsetof(tic_cartridge, banks->music.patterns), sizeof(tic_track_pattern), true},
+	{"TRACKS", 		MUSIC_TRACKS, offsetof(tic_cartridge, banks->music.tracks), sizeof(tic_track), true},
 };
 
 static s32 saveProject(Console* console, void* buffer, const char* comment)
@@ -1330,7 +1332,8 @@ static void onImportSprites(const char* name, const void* buffer, size_t size, v
 						tic_rgb rgb = {c->r, c->g, c->b};
 						u8 color = tic_tool_find_closest_color(console->tic->cart.palette.colors, &rgb);
 
-						setSpritePixel(console->tic->cart.tiles.data, x, y, color);
+						// TODO: should be current bank
+						setSpritePixel(console->tic->cart.banks[0].tiles.data, x, y, color);
 					}
 
 				gif_close(image);
@@ -1352,8 +1355,9 @@ static void injectMap(Console* console, const void* buffer, s32 size)
 {
 	enum {Size = sizeof(tic_map)};
 
-	SDL_memset(&console->tic->cart.map, 0, Size);
-	SDL_memcpy(&console->tic->cart.map, buffer, SDL_min(size, Size));
+	// TODO: should be current bank
+	SDL_memset(&console->tic->cart.banks[0].map, 0, Size);
+	SDL_memcpy(&console->tic->cart.banks[0].map, buffer, SDL_min(size, Size));
 }
 
 static void onImportMap(const char* name, const void* buffer, size_t size, void* data)
@@ -1453,7 +1457,7 @@ static void exportSprites(Console* console)
 		{
 			for (s32 y = 0; y < Height; y++)
 				for (s32 x = 0; x < Width; x++)
-					data[x + y * Width] = getSpritePixel(console->tic->cart.tiles.data, x, y);
+					data[x + y * Width] = getSpritePixel(console->tic->cart.banks[0].tiles.data, x, y);
 
 			s32 size = 0;
 			if((size = writeGifData(console->tic, buffer, data, Width, Height)))
@@ -1493,7 +1497,7 @@ static void exportMap(Console* console)
 
 	if(buffer)
 	{
-		SDL_memcpy(buffer, console->tic->cart.map.data, Size);
+		SDL_memcpy(buffer, console->tic->cart.banks[0].map.data, Size);
 		fsGetFileData(onMapExported, "world.map", buffer, Size, DEFAULT_CHMOD, console);
 	}
 }
@@ -2764,7 +2768,7 @@ static bool cmdInjectSprites(Console* console, const char* param, const char* na
 						tic_rgb rgb = {c->r, c->g, c->b};
 						u8 color = tic_tool_find_closest_color(embed.file.palette.colors, &rgb);
 
-						setSpritePixel(embed.file.tiles.data, x, y, color);
+						setSpritePixel(embed.file.banks[0].tiles.data, x, y, color);
 					}
 
 				gif_close(image);
diff --git a/src/dialog.c b/src/dialog.c
index e28b224..2912be3 100644
--- a/src/dialog.c
+++ b/src/dialog.c
@@ -170,7 +170,7 @@ static void drawDialog(Dialog* dlg)
 
 	{
 		u8 chromakey = 14;
-		tic->api.sprite_ex(tic, &tic->config.tiles, 2, rect.x+6, rect.y-4, 2, 2, &chromakey, 1, 1, tic_no_flip, tic_no_rotate);
+		tic->api.sprite_ex(tic, &tic->config.banks[0].tiles, 2, rect.x+6, rect.y-4, 2, 2, &chromakey, 1, 1, tic_no_flip, tic_no_rotate);
 	}
 
 	{
diff --git a/src/map.c b/src/map.c
index 973909b..855cdea 100644
--- a/src/map.c
+++ b/src/map.c
@@ -314,7 +314,7 @@ static void drawTileIndex(Map* map, s32 x, s32 y)
 		{
 			s32 tx = 0, ty = 0;
 			getMouseMap(map, &tx, &ty);
-			index = map->tic->api.map_get(map->tic, &map->tic->cart.map, tx, ty);
+			index = map->tic->api.map_get(map->tic, &map->tic->cart.banks[0].map, tx, ty);
 		}
 	}
 
@@ -397,7 +397,7 @@ static void drawSheetOvr(Map* map, s32 x, s32 y)
 
 	for(s32 j = 0, index = 0; j < rect.h; j += TIC_SPRITESIZE)
 		for(s32 i = 0; i < rect.w; i += TIC_SPRITESIZE, index++)
-			map->tic->api.sprite(map->tic, &map->tic->cart.tiles, index, x + i, y + j, NULL, 0);
+			map->tic->api.sprite(map->tic, &map->tic->cart.banks[0].tiles, index, x + i, y + j, NULL, 0);
 
 	{
 		s32 bx = map->sheet.rect.x * TIC_SPRITESIZE - 1 + x;
@@ -437,7 +437,7 @@ static void setMapSprite(Map* map, s32 x, s32 y)
 
 	for(s32 j = 0; j < map->sheet.rect.h; j++)
 		for(s32 i = 0; i < map->sheet.rect.w; i++)
-			map->tic->api.map_set(map->tic, &map->tic->cart.map, (x+i)%TIC_MAP_WIDTH, (y+j)%TIC_MAP_HEIGHT, (mx+i) + (my+j) * SHEET_COLS);
+			map->tic->api.map_set(map->tic, &map->tic->cart.banks[0].map, (x+i)%TIC_MAP_WIDTH, (y+j)%TIC_MAP_HEIGHT, (mx+i) + (my+j) * SHEET_COLS);
 
 	history_add(map->history);
 }
@@ -470,7 +470,7 @@ static void drawTileCursor(Map* map)
 
 		for(s32 j = 0, ty=my; j < map->sheet.rect.h; j++, ty+=TIC_SPRITESIZE)
 			for(s32 i = 0, tx=mx; i < map->sheet.rect.w; i++, tx+=TIC_SPRITESIZE)
-				map->tic->api.sprite(map->tic, &map->tic->cart.tiles, (sx+i) + (sy+j) * SHEET_COLS, tx, ty, NULL, 0);					
+				map->tic->api.sprite(map->tic, &map->tic->cart.banks[0].tiles, (sx+i) + (sy+j) * SHEET_COLS, tx, ty, NULL, 0);					
 	}
 
 	drawCursorPos(map, mx, my);
@@ -512,7 +512,7 @@ static void processMouseDrawMode(Map* map)
 	{
 		s32 tx = 0, ty = 0;
 		getMouseMap(map, &tx, &ty);
-		s32 index = map->tic->api.map_get(map->tic, &map->tic->cart.map, tx, ty);
+		s32 index = map->tic->api.map_get(map->tic, &map->tic->cart.banks[0].map, tx, ty);
 
 		map->sheet.rect = (SDL_Rect){index % SHEET_COLS, index / SHEET_COLS, 1, 1};
 	}
@@ -593,7 +593,7 @@ static void drawPasteData(Map* map)
 
 		for(s32 j = 0; j < h; j++)
 			for(s32 i = 0; i < w; i++)
-				map->tic->api.map_set(map->tic, &map->tic->cart.map, (mx+i)%TIC_MAP_WIDTH, (my+j)%TIC_MAP_HEIGHT, data[i + j * w]);
+				map->tic->api.map_set(map->tic, &map->tic->cart.banks[0].map, (mx+i)%TIC_MAP_WIDTH, (my+j)%TIC_MAP_HEIGHT, data[i + j * w]);
 
 		history_add(map->history);
 
@@ -612,7 +612,7 @@ static void drawPasteData(Map* map)
 		
 		for(s32 j = 0; j < h; j++)
 			for(s32 i = 0; i < w; i++)
-				map->tic->api.sprite(map->tic, &map->tic->cart.tiles, data[i + j * w], mx + i*TIC_SPRITESIZE, my + j*TIC_SPRITESIZE, NULL, 0);
+				map->tic->api.sprite(map->tic, &map->tic->cart.banks[0].tiles, data[i + j * w], mx + i*TIC_SPRITESIZE, my + j*TIC_SPRITESIZE, NULL, 0);
 	}
 }
 
@@ -764,7 +764,7 @@ static void fillMap(Map* map, s32 x, s32 y, u8 tile)
 	{
 		for(s32 j = 0; j < map->sheet.rect.h; j++)
 			for(s32 i = 0; i < map->sheet.rect.w; i++)
-				map->tic->api.map_set(map->tic, &map->tic->cart.map, x+i, y+j, (mx+i) + (my+j) * SHEET_COLS);
+				map->tic->api.map_set(map->tic, &map->tic->cart.banks[0].map, x+i, y+j, (mx+i) + (my+j) * SHEET_COLS);
 
 		for(s32 i = 0; i < COUNT_OF(dx); i++) 
 		{
@@ -776,7 +776,7 @@ static void fillMap(Map* map, s32 x, s32 y, u8 tile)
 				bool match = true;
 				for(s32 j = 0; j < map->sheet.rect.h; j++)
 					for(s32 i = 0; i < map->sheet.rect.w; i++)
-						if(map->tic->api.map_get(map->tic, &map->tic->cart.map, nx+i, ny+j) != tile)
+						if(map->tic->api.map_get(map->tic, &map->tic->cart.banks[0].map, nx+i, ny+j) != tile)
 							match = false;
 
 				if(match)
@@ -801,7 +801,7 @@ static void processMouseFillMode(Map* map)
 		s32 tx = 0, ty = 0;
 		getMouseMap(map, &tx, &ty);
 
-		fillMap(map, tx, ty, map->tic->api.map_get(map->tic, &map->tic->cart.map, tx, ty));
+		fillMap(map, tx, ty, map->tic->api.map_get(map->tic, &map->tic->cart.banks[0].map, tx, ty));
 		history_add(map->history);
 	}
 }
@@ -864,7 +864,7 @@ static void drawMapOvr(Map* map)
 	s32 scrollX = map->scroll.x % TIC_SPRITESIZE;
 	s32 scrollY = map->scroll.y % TIC_SPRITESIZE;
 
-	map->tic->api.map(map->tic, &map->tic->cart.map, &map->tic->cart.tiles, map->scroll.x / TIC_SPRITESIZE, map->scroll.y / TIC_SPRITESIZE, 
+	map->tic->api.map(map->tic, &map->tic->cart.banks[0].map, &map->tic->cart.banks[0].tiles, map->scroll.x / TIC_SPRITESIZE, map->scroll.y / TIC_SPRITESIZE, 
 		TIC_MAP_SCREEN_WIDTH + 1, TIC_MAP_SCREEN_HEIGHT + 1, -scrollX, -scrollY, -1, 1);
 
 	if(map->canvas.grid || map->scroll.active)
@@ -950,7 +950,7 @@ static void copySelectionToClipboard(Map* map)
 					normalizeMapRect(&x, &y);
 
 					s32 index = x + y * TIC_MAP_WIDTH;
-					*ptr++ = map->tic->cart.map.data[index];
+					*ptr++ = map->tic->cart.banks[0].map.data[index];
 				}		
 
 			toClipboard(buffer, size, true);
@@ -978,7 +978,7 @@ static void deleteSelection(Map* map)
 				normalizeMapRect(&x, &y);
 
 				s32 index = x + y * TIC_MAP_WIDTH;
-				map->tic->cart.map.data[index] = 0;
+				map->tic->cart.banks[0].map.data[index] = 0;
 			}
 
 		history_add(map->history);
@@ -1185,7 +1185,7 @@ void initMap(Map* map, tic_mem* tic)
 			.gesture = false,
 			.start = {0, 0},
 		},
-		.history = history_create(&tic->cart.map, sizeof tic->cart.map),
+		.history = history_create(&tic->cart.banks[0].map, sizeof(tic_map)),
 		.event = onStudioEvent,
 		.overlap = overlap,
 	};
diff --git a/src/menu.c b/src/menu.c
index 0e38308..c81612b 100644
--- a/src/menu.c
+++ b/src/menu.c
@@ -124,7 +124,7 @@ static void drawDialog(Menu* menu)
 
 	{
 		u8 chromakey = 14;
-		tic->api.sprite_ex(tic, &tic->config.tiles, 0, rect.x+6, rect.y-4, 2, 2, &chromakey, 1, 1, tic_no_flip, tic_no_rotate);
+		tic->api.sprite_ex(tic, &tic->config.banks[0].tiles, 0, rect.x+6, rect.y-4, 2, 2, &chromakey, 1, 1, tic_no_flip, tic_no_rotate);
 	}	
 }
 
@@ -209,7 +209,7 @@ static void drawPlayerButtons(Menu* menu, s32 x, s32 y)
 		if(menu->gamepad.selected == index && menu->ticks % TIC_FRAMERATE < TIC_FRAMERATE / 2)
 			continue;
 
-		tic->api.sprite_ex(tic, &tic->config.tiles, 8+i, rect.x, rect.y, 1, 1, &chromakey, 1, 1, tic_no_flip, tic_no_rotate);
+		tic->api.sprite_ex(tic, &tic->config.banks[0].tiles, 8+i, rect.x, rect.y, 1, 1, &chromakey, 1, 1, tic_no_flip, tic_no_rotate);
 
 		s32 code = codes[index];
 		char label[32];
diff --git a/src/music.c b/src/music.c
index a061a06..6fa2eed 100644
--- a/src/music.c
+++ b/src/music.c
@@ -215,7 +215,7 @@ static void drawSwitch(Music* music, s32 x, s32 y, const char* label, s32 value,
 
 static tic_track* getTrack(Music* music)
 {
-	return &music->tic->cart.music.tracks.data[music->track];
+	return &music->tic->cart.banks[0].music.tracks.data[music->track];
 }
 
 static s32 getRows(Music* music)
@@ -368,7 +368,7 @@ static tic_track_pattern* getPattern(Music* music, s32 channel)
 {
 	s32 patternId = tic_tool_get_pattern_id(getTrack(music), music->tracker.frame, channel);
 
-	return patternId ? &music->tic->cart.music.patterns.data[patternId - PATTERN_START] : NULL;
+	return patternId ? &music->tic->cart.banks[0].music.patterns.data[patternId - PATTERN_START] : NULL;
 }
 
 static tic_track_pattern* getChannelPattern(Music* music)
@@ -1327,7 +1327,7 @@ static void drawTumbler(Music* music, s32 x, s32 y, s32 index)
 	}
 
 	u8 color = Chroma;
-	tic->api.sprite(tic, &tic->config.tiles, music->tracker.patterns[index] ? On : Off, x, y, &color, 1);
+	tic->api.sprite(tic, &tic->config.banks[0].tiles, music->tracker.patterns[index] ? On : Off, x, y, &color, 1);
 }
 
 static void drawTracker(Music* music, s32 x, s32 y)
@@ -1643,7 +1643,7 @@ void initMusic(Music* music, tic_mem* tic)
 		},
 
 		.tab = MUSIC_TRACKER_TAB,
-		.history = history_create(&tic->cart.music, sizeof(tic_music)),
+		.history = history_create(&tic->cart.banks[0].music, sizeof(tic_music)),
 		.event = onStudioEvent,
 	};
 
diff --git a/src/sfx.c b/src/sfx.c
index fa4aba6..bc3a371 100644
--- a/src/sfx.c
+++ b/src/sfx.c
@@ -106,7 +106,7 @@ static void drawSwitch(Sfx* sfx, s32 x, s32 y, const char* label, s32 value, voi
 
 static tic_sound_effect* getEffect(Sfx* sfx)
 {
-	return sfx->tic->cart.sfx.data + sfx->index;
+	return sfx->tic->cart.banks[0].sfx.data + sfx->index;
 }
 
 static void setIndex(Sfx* sfx, s32 delta)
@@ -169,7 +169,7 @@ static void drawLoopPanel(Sfx* sfx, s32 x, s32 y)
 
 static tic_waveform* getWaveformById(Sfx* sfx, s32 i)
 {
-	return &sfx->tic->cart.sfx.waveform.envelopes[i];
+	return &sfx->tic->cart.banks[0].sfx.waveform.envelopes[i];
 }
 
 static tic_waveform* getWaveform(Sfx* sfx)
@@ -1058,8 +1058,8 @@ void initSfx(Sfx* sfx, tic_mem* tic)
 		.tab = SFX_ENVELOPES_TAB,
 		.history =
 		{
-			.envelope = history_create(&tic->cart.sfx.data, sizeof tic->cart.sfx.data),
-			.waveform = history_create(&tic->cart.sfx.waveform, sizeof tic->cart.sfx.waveform),
+			.envelope = history_create(&tic->cart.banks[0].sfx.data, sizeof tic->cart.banks[0].sfx.data),
+			.waveform = history_create(&tic->cart.banks[0].sfx.waveform, sizeof tic->cart.banks[0].sfx.waveform),
 		},
 		.event = onStudioEvent,
 	};
diff --git a/src/sprite.c b/src/sprite.c
index c56e010..6c7dc2f 100644
--- a/src/sprite.c
+++ b/src/sprite.c
@@ -33,12 +33,12 @@
 
 static u8 getSheetPixel(Sprite* sprite, s32 x, s32 y)
 {
-	return getSpritePixel(sprite->tic->cart.tiles.data, x, sprite->index >= TIC_BANK_SPRITES ? y + TIC_SPRITESHEET_SIZE: y);
+	return getSpritePixel(sprite->tic->cart.banks[0].tiles.data, x, sprite->index >= TIC_BANK_SPRITES ? y + TIC_SPRITESHEET_SIZE: y);
 }
 
 static void setSheetPixel(Sprite* sprite, s32 x, s32 y, u8 color)
 {
-	setSpritePixel(sprite->tic->cart.tiles.data, x, sprite->index >= TIC_BANK_SPRITES ? y + TIC_SPRITESHEET_SIZE: y, color);
+	setSpritePixel(sprite->tic->cart.banks[0].tiles.data, x, sprite->index >= TIC_BANK_SPRITES ? y + TIC_SPRITESHEET_SIZE: y, color);
 }
 
 static s32 getIndexPosX(Sprite* sprite)
@@ -940,7 +940,7 @@ static void drawSheetOvr(Sprite* sprite, s32 x, s32 y)
 
 	for(s32 j = 0, index = (sprite->index - sprite->index % TIC_BANK_SPRITES); j < rect.h; j += TIC_SPRITESIZE)
 		for(s32 i = 0; i < rect.w; i += TIC_SPRITESIZE, index++)
-			sprite->tic->api.sprite(sprite->tic, &sprite->tic->cart.tiles, index, x + i, y + j, NULL, 0);
+			sprite->tic->api.sprite(sprite->tic, &sprite->tic->cart.banks[0].tiles, index, x + i, y + j, NULL, 0);
 	{
 		s32 bx = getIndexPosX(sprite) + x - 1;
 		s32 by = getIndexPosY(sprite) + y - 1;
@@ -1551,7 +1551,7 @@ void initSprite(Sprite* sprite, tic_mem* tic)
 			.front = sprite->select.front,
 		},
 		.mode = SPRITE_DRAW_MODE,
-		.history = history_create(&tic->cart.tiles, TIC_SPRITES * sizeof(tic_tile)),
+		.history = history_create(&tic->cart.banks[0].tiles, TIC_SPRITES * sizeof(tic_tile)),
 		.event = onStudioEvent,
 		.overlap = overlap,
 	};
diff --git a/src/studio.c b/src/studio.c
index aa0c34f..cff9da7 100644
--- a/src/studio.c
+++ b/src/studio.c
@@ -278,7 +278,7 @@ static struct
 
 void playSystemSfx(s32 id)
 {
-	const tic_sound_effect* effect = &studio.tic->config.sfx.data[id];
+	const tic_sound_effect* effect = &studio.tic->config.banks[0].sfx.data[id];
 	studio.tic->api.sfx_ex(studio.tic, id, effect->note, effect->octave, -1, 0, MAX_VOLUME, 0);
 }
 
@@ -2049,7 +2049,7 @@ static void renderCursor()
 	SDL_ShowCursor(getConfig()->theme.cursor.sprite >= 0 ? SDL_DISABLE : SDL_ENABLE);
 
 	if(getConfig()->theme.cursor.sprite >= 0)
-		blitCursor(studio.tic->config.tiles.data[getConfig()->theme.cursor.sprite].data);
+		blitCursor(studio.tic->config.banks[0].tiles.data[getConfig()->theme.cursor.sprite].data);
 }
 
 static void useSystemPalette()
@@ -2104,12 +2104,12 @@ static void renderStudio()
 		case TIC_DIALOG_MODE:
 		case TIC_MENU_MODE:
 		case TIC_SURF_MODE:
-			sfx = &studio.tic->config.sfx;
-			music = &studio.tic->config.music;
+			sfx = &studio.tic->config.banks[0].sfx;
+			music = &studio.tic->config.banks[0].music;
 			break;
 		default:
-			sfx = &studio.tic->cart.sfx;
-			music = &studio.tic->cart.music;
+			sfx = &studio.tic->cart.banks[0].sfx;
+			music = &studio.tic->cart.banks[0].music;
 		}
 
 		studio.tic->api.tick_start(studio.tic, sfx, music);
@@ -2283,7 +2283,7 @@ static void initTouchGamepad()
 	if (!studio.renderer)
 		return;
 
-	studio.tic->api.map(studio.tic, &studio.tic->config.map, &studio.tic->config.tiles, 0, 0, TIC_MAP_SCREEN_WIDTH, TIC_MAP_SCREEN_HEIGHT, 0, 0, -1, 1);
+	studio.tic->api.map(studio.tic, &studio.tic->config.banks[0].map, &studio.tic->config.banks[0].tiles, 0, 0, TIC_MAP_SCREEN_WIDTH, TIC_MAP_SCREEN_HEIGHT, 0, 0, -1, 1);
 
 	if(!studio.gamepad.texture)
 	{
@@ -2310,7 +2310,7 @@ static void updateSystemFont()
 	for(s32 i = 0; i < TIC_FONT_CHARS; i++)
 		for(s32 y = 0; y < TIC_SPRITESIZE; y++)
 			for(s32 x = 0; x < TIC_SPRITESIZE; x++)
-				if(tic_tool_peek4(&studio.tic->config.sprites.data[i], TIC_SPRITESIZE*(y+1) - x-1))
+				if(tic_tool_peek4(&studio.tic->config.banks[0].sprites.data[i], TIC_SPRITESIZE*(y+1) - x-1))
 					studio.tic->font.data[i*BITS_IN_BYTE+y] |= 1 << x;
 }
 
@@ -2335,7 +2335,7 @@ static void setWindowIcon()
 	for(s32 j = 0, index = 0; j < Size; j++)
 		for(s32 i = 0; i < Size; i++, index++)
 		{
-			u8 color = getSpritePixel(studio.tic->config.tiles.data, i/Scale, j/Scale);
+			u8 color = getSpritePixel(studio.tic->config.banks[0].tiles.data, i/Scale, j/Scale);
 			pixels[index] = color == ColorKey ? 0 : pal[color];
 		}
 
diff --git a/src/surf.c b/src/surf.c
index 3e15d63..07b3605 100644
--- a/src/surf.c
+++ b/src/surf.c
@@ -202,14 +202,14 @@ static void drawTopToolbar(Surf* surf, s32 x, s32 y)
 	enum{Gap = 10, TipX = 150, SelectWidth = 54};
 
 	u8 colorkey = 0;
-	tic->api.sprite_ex(tic, &tic->config.tiles, 12, TipX, y+1, 1, 1, &colorkey, 1, 1, tic_no_flip, tic_no_rotate);
+	tic->api.sprite_ex(tic, &tic->config.banks[0].tiles, 12, TipX, y+1, 1, 1, &colorkey, 1, 1, tic_no_flip, tic_no_rotate);
 	{
 		static const char Label[] = "SELECT";
 		tic->api.text(tic, Label, TipX + Gap, y+3, tic_color_black);
 		tic->api.text(tic, Label, TipX + Gap, y+2, tic_color_white);		
 	}
 
-	tic->api.sprite_ex(tic, &tic->config.tiles, 13, TipX + SelectWidth, y + 1, 1, 1, &colorkey, 1, 1, tic_no_flip, tic_no_rotate);
+	tic->api.sprite_ex(tic, &tic->config.banks[0].tiles, 13, TipX + SelectWidth, y + 1, 1, 1, &colorkey, 1, 1, tic_no_flip, tic_no_rotate);
 	{
 		static const char Label[] = "BACK";
 		tic->api.text(tic, Label, TipX + Gap + SelectWidth, y +3, tic_color_black);
@@ -244,7 +244,7 @@ static void drawBottomToolbar(Surf* surf, s32 x, s32 y)
 
 		u8 colorkey = 0;
 
-		tic->api.sprite_ex(tic, &tic->config.tiles, 15, TipX + SelectWidth, y + 1, 1, 1, &colorkey, 1, 1, tic_no_flip, tic_no_rotate);
+		tic->api.sprite_ex(tic, &tic->config.banks[0].tiles, 15, TipX + SelectWidth, y + 1, 1, 1, &colorkey, 1, 1, tic_no_flip, tic_no_rotate);
 		{
 			static const char Label[] = "WEBSITE";
 			tic->api.text(tic, Label, TipX + Gap + SelectWidth, y +3, tic_color_black);
@@ -355,7 +355,7 @@ static void drawBG(Surf* surf)
 	for(s32 j = 0; j < Height + 1; j++)
 		for(s32 i = 0; i < Width + 1; i++)
 			if(counter++ % 2)
-				tic->api.sprite_ex(tic, &tic->config.tiles, 34, i*Size - offset, j*Size - offset, 2, 2, 0, 0, 1, tic_no_flip, tic_no_rotate);
+				tic->api.sprite_ex(tic, &tic->config.banks[0].tiles, 34, i*Size - offset, j*Size - offset, 2, 2, 0, 0, 1, tic_no_flip, tic_no_rotate);
 }
 
 static void replace(char* src, const char* what, const char* with)
diff --git a/src/tic.c b/src/tic.c
index b29bb9b..3dc63e8 100644
--- a/src/tic.c
+++ b/src/tic.c
@@ -1325,12 +1325,12 @@ static void initCover(tic_mem* tic)
 
 static void cart2ram(tic_mem* memory)
 {
-	memcpy(&memory->ram.tiles, &memory->cart.tiles, sizeof(tic_tiles));
-	memcpy(&memory->ram.sprites, &memory->cart.sprites, sizeof(tic_tiles));
-	memcpy(&memory->ram.map, &memory->cart.map, sizeof(tic_tiles));
+	memcpy(&memory->ram.tiles, &memory->cart.banks[0].tiles, sizeof(tic_tiles));
+	memcpy(&memory->ram.sprites, &memory->cart.banks[0].sprites, sizeof(tic_tiles));
+	memcpy(&memory->ram.map, &memory->cart.banks[0].map, sizeof(tic_tiles));
 
-	memcpy(&memory->ram.sfx, &memory->cart.sfx, sizeof(tic_sfx));
-	memcpy(&memory->ram.music, &memory->cart.music, sizeof(tic_music));
+	memcpy(&memory->ram.sfx, &memory->cart.banks[0].sfx, sizeof(tic_sfx));
+	memcpy(&memory->ram.music, &memory->cart.banks[0].music, sizeof(tic_music));
 
 	initCover(memory);
 }
@@ -1595,14 +1595,14 @@ static void api_load(tic_cartridge* cart, const u8* buffer, s32 size, bool palet
 
 		switch(chunk.type)
 		{
-		case CHUNK_TILES: 		LOAD_CHUNK(cart->tiles); 					break;
-		case CHUNK_SPRITES: 	LOAD_CHUNK(cart->sprites); 					break;
-		case CHUNK_MAP: 		LOAD_CHUNK(cart->map); 						break;
-		case CHUNK_CODE: 		LOAD_CHUNK(cart->code); 						break;
-		case CHUNK_SOUND: 		LOAD_CHUNK(cart->sfx.data); 				break;
-		case CHUNK_WAVEFORM:	LOAD_CHUNK(cart->sfx.waveform);			break;
-		case CHUNK_MUSIC:		LOAD_CHUNK(cart->music.tracks.data); 		break;
-		case CHUNK_PATTERNS:	LOAD_CHUNK(cart->music.patterns.data); 	break;
+		case CHUNK_TILES: 		LOAD_CHUNK(cart->banks[0].tiles); 					break;
+		case CHUNK_SPRITES: 	LOAD_CHUNK(cart->banks[0].sprites); 				break;
+		case CHUNK_MAP: 		LOAD_CHUNK(cart->banks[0].map); 					break;
+		case CHUNK_CODE: 		LOAD_CHUNK(cart->code); 							break;
+		case CHUNK_SOUND: 		LOAD_CHUNK(cart->banks[0].sfx.data); 				break;
+		case CHUNK_WAVEFORM:	LOAD_CHUNK(cart->banks[0].sfx.waveform);			break;
+		case CHUNK_MUSIC:		LOAD_CHUNK(cart->banks[0].music.tracks.data); 		break;
+		case CHUNK_PATTERNS:	LOAD_CHUNK(cart->banks[0].music.patterns.data); 	break;
 		case CHUNK_PALETTE:		
 			if(palette)
 				LOAD_CHUNK(cart->palette); 					
@@ -1664,14 +1664,14 @@ static s32 api_save(const tic_cartridge* cart, u8* buffer)
 
 	#define SAVE_CHUNK(id, from) saveChunk(buffer, id, &from, sizeof(from))
 
-	buffer = SAVE_CHUNK(CHUNK_TILES, 	cart->tiles);
-	buffer = SAVE_CHUNK(CHUNK_SPRITES, 	cart->sprites);
-	buffer = SAVE_CHUNK(CHUNK_MAP, 		cart->map);
+	buffer = SAVE_CHUNK(CHUNK_TILES, 	cart->banks[0].tiles);
+	buffer = SAVE_CHUNK(CHUNK_SPRITES, 	cart->banks[0].sprites);
+	buffer = SAVE_CHUNK(CHUNK_MAP, 		cart->banks[0].map);
 	buffer = SAVE_CHUNK(CHUNK_CODE, 	cart->code);
-	buffer = SAVE_CHUNK(CHUNK_SOUND, 	cart->sfx.data);
-	buffer = SAVE_CHUNK(CHUNK_WAVEFORM, cart->sfx.waveform);
-	buffer = SAVE_CHUNK(CHUNK_PATTERNS, cart->music.patterns.data);
-	buffer = SAVE_CHUNK(CHUNK_MUSIC, 	cart->music.tracks.data);
+	buffer = SAVE_CHUNK(CHUNK_SOUND, 	cart->banks[0].sfx.data);
+	buffer = SAVE_CHUNK(CHUNK_WAVEFORM, cart->banks[0].sfx.waveform);
+	buffer = SAVE_CHUNK(CHUNK_PATTERNS, cart->banks[0].music.patterns.data);
+	buffer = SAVE_CHUNK(CHUNK_MUSIC, 	cart->banks[0].music.tracks.data);
 	buffer = SAVE_CHUNK(CHUNK_PALETTE, 	cart->palette);
 
 	buffer = saveFixedChunk(buffer, CHUNK_COVER, cart->cover.data, cart->cover.size);
diff --git a/src/tic.h b/src/tic.h
index 96bd448..c91dc8c 100644
--- a/src/tic.h
+++ b/src/tic.h
@@ -321,12 +321,6 @@ typedef union
 	u8 data[TIC_PALETTE_SIZE * sizeof(tic_rgb)];
 } tic_palette;
 
-// typedef struct
-// {
-// 	tic_sfx sfx;
-// 	tic_music music;
-// } tic_sound;
-
 typedef struct
 {
 	tic_tile data[TIC_BANK_SPRITES];
@@ -343,20 +337,7 @@ typedef struct
 
 typedef struct
 {
-	union
-	{
-		struct
-		{
-			tic_tiles tiles;
-			tic_tiles sprites;
-			tic_map map;
-			tic_sfx sfx;
-			tic_music music;
-		};
-
-		tic_bank banks[TIC_BANKS];
-	};
-
+	tic_bank banks[TIC_BANKS];
 	tic_code code;
 	tic_cover_image cover;
 	tic_palette palette;
diff --git a/src/world.c b/src/world.c
index 8d6dda0..89c7587 100644
--- a/src/world.c
+++ b/src/world.c
@@ -105,13 +105,13 @@ void initWorld(World* world, tic_mem* tic, Map* map)
 
 	for(s32 i = 0; i < TIC80_WIDTH * TIC80_HEIGHT; i++)
 	{
-		u8 index = tic->cart.map.data[i];
+		u8 index = tic->cart.banks[0].map.data[i];
 
 		if(index)
 		{
 			SDL_memset(colors, 0, sizeof colors);
 
-			tic_tile* tile = &tic->cart.tiles.data[index];
+			tic_tile* tile = &tic->cart.banks[0].tiles.data[index];
 
 			for(s32 p = 0; p < TIC_SPRITESIZE * TIC_SPRITESIZE; p++)
 			{