diff --git a/misc/Memory Map.ods b/misc/Memory Map.ods
index 04aed86..3013222 100644
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diff --git a/roms/f256k/toolbox-00.bin b/roms/f256k/toolbox-00.bin
deleted file mode 100644
index cec34f6..0000000
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diff --git a/roms/f256k/toolbox-01.bin b/roms/f256k/toolbox-01.bin
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diff --git a/roms/f256k/toolbox-02.bin b/roms/f256k/toolbox-02.bin
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diff --git a/roms/f256k/toolbox-04.bin b/roms/f256k/toolbox-04.bin
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diff --git a/roms/f256k/toolbox-0A.bin b/roms/f256k/toolbox-0A.bin
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diff --git a/roms/f256k/toolbox-20.bin b/roms/f256k/toolbox-20.bin
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index 0000000..becfba8
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diff --git a/roms/f256k/toolbox-21.bin b/roms/f256k/toolbox-21.bin
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index 0000000..3a2fa03
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diff --git a/roms/f256k/toolbox-22.bin b/roms/f256k/toolbox-22.bin
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diff --git a/roms/f256k/toolbox-23.bin b/roms/f256k/toolbox-23.bin
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diff --git a/roms/f256k/toolbox-24.bin b/roms/f256k/toolbox-24.bin
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index 0000000..d708e37
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diff --git a/roms/f256k/toolbox-25.bin b/roms/f256k/toolbox-25.bin
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index 0000000..34177e5
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diff --git a/roms/f256k/toolbox-26.bin b/roms/f256k/toolbox-26.bin
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index 0000000..11f0200
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diff --git a/roms/f256k/toolbox-27.bin b/roms/f256k/toolbox-27.bin
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index 0000000..5e0d044
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diff --git a/roms/f256k/toolbox-28.bin b/roms/f256k/toolbox-28.bin
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index 0000000..9c98505
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diff --git a/roms/f256k/toolbox-29.bin b/roms/f256k/toolbox-29.bin
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index 0000000..376a0c1
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diff --git a/roms/f256k/toolbox-2A.bin b/roms/f256k/toolbox-2A.bin
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index 0000000..c82d01e
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diff --git a/roms/f256k/toolbox-2C.bin b/roms/f256k/toolbox-2C.bin
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index 0000000..cf04955
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diff --git a/roms/f256k/toolbox-2D.bin b/roms/f256k/toolbox-2D.bin
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index 0000000..d6af58c
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diff --git a/roms/f256k/toolbox-2E.bin b/roms/f256k/toolbox-2E.bin
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index 0000000..0195545
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diff --git a/roms/f256k/toolbox-2F.bin b/roms/f256k/toolbox-2F.bin
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index 0000000..9f1f161
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diff --git a/roms/f256k/toolbox-30.bin b/roms/f256k/toolbox-30.bin
new file mode 100644
index 0000000..767497f
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diff --git a/roms/f256k/toolbox-0F.bin b/roms/f256k/toolbox-31.bin
similarity index 62%
rename from roms/f256k/toolbox-0F.bin
rename to roms/f256k/toolbox-31.bin
index 9a6c02a..2af6a14 100644
Binary files a/roms/f256k/toolbox-0F.bin and b/roms/f256k/toolbox-31.bin differ
diff --git a/roms/f256k/toolbox-3F.bin b/roms/f256k/toolbox-3F.bin
index 0f8d0c6..493f00d 100644
Binary files a/roms/f256k/toolbox-3F.bin and b/roms/f256k/toolbox-3F.bin differ
diff --git a/roms/f256k/toolbox.bin b/roms/f256k/toolbox.bin
index 37e4c53..d76b992 100644
Binary files a/roms/f256k/toolbox.bin and b/roms/f256k/toolbox.bin differ
diff --git a/roms/f256k/toolbox.csv b/roms/f256k/toolbox.csv
index e299297..f654ac5 100644
--- a/roms/f256k/toolbox.csv
+++ b/roms/f256k/toolbox.csv
@@ -1,17 +1,19 @@
-"00","toolbox-00.bin"
-"01","toolbox-01.bin"
-"02","toolbox-02.bin"
-"03","toolbox-03.bin"
-"04","toolbox-04.bin"
-"05","toolbox-05.bin"
-"06","toolbox-06.bin"
-"07","toolbox-07.bin"
-"08","toolbox-08.bin"
-"09","toolbox-09.bin"
-"0A","toolbox-0A.bin"
-"0B","toolbox-0B.bin"
-"0C","toolbox-0C.bin"
-"0D","toolbox-0D.bin"
-"0E","toolbox-0E.bin"
-"0F","toolbox-0F.bin"
+"20","toolbox-20.bin"
+"21","toolbox-21.bin"
+"22","toolbox-22.bin"
+"23","toolbox-23.bin"
+"24","toolbox-24.bin"
+"25","toolbox-25.bin"
+"26","toolbox-26.bin"
+"27","toolbox-27.bin"
+"28","toolbox-28.bin"
+"29","toolbox-29.bin"
+"2A","toolbox-2A.bin"
+"2B","toolbox-2B.bin"
+"2C","toolbox-2C.bin"
+"2D","toolbox-2D.bin"
+"2E","toolbox-2E.bin"
+"2F","toolbox-2F.bin"
+"30","toolbox-30.bin"
+"31","toolbox-31.bin"
 "3F","toolbox-3F.bin"
diff --git a/src/C256/f256-flash.scm b/src/C256/f256-flash.scm
index 1406771..2883579 100644
--- a/src/C256/f256-flash.scm
+++ b/src/C256/f256-flash.scm
@@ -1,15 +1,20 @@
 (define memories
   '(
 	(memory flash
-		(address (#xf80000 . #xfdffff))
+		(address (#xfc0000 . #xffdfff))
 		(type ROM)
 		(fill #xff)
 	    (section
-			(jumptable #xf80000)
 			data_init_table
 			data
 			ifar))
 
+	(memory flash-high
+		(address (#xffe000 . #xfffeff))
+		(type ROM)
+		(fill #xff)
+		(section jumptable))
+
 	(memory flash-shadow
 		(address (#xffff00 . #xffffff))
 		(type ROM)
@@ -42,12 +47,12 @@
 		(placement-group bits (section data near)))
 
 	(memory stackram
-		(address (#x00c000 . #x00cfff))
+		(address (#x00edeb . #xfdeb))
 		(type RAM)
 		(section stack))
 
     (memory DirectPage
-		(address (#x00bf00 . #x00bfff))
+		(address (#x00fe00 . #x00feff))
         (section (registers ztiny)))
 
     (block stack (size #x1000))
diff --git a/src/Makefile b/src/Makefile
index 37eef00..afa2b91 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2,7 +2,7 @@
 DEBUGGER=../module/Calypsi-remote-debug/src
 
 UNIT := F256K
-MEMORY := RAM
+MEMORY := ROM
 
 # Define OS-dependent variables
 
diff --git a/src/boot.c b/src/boot.c
index eb8182a..249ce83 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -20,6 +20,7 @@
 #include "dev/txt_screen.h"
 #include "dev/sprites.h"
 #include "dev/tiles.h"
+#include "gabe_reg.h"
 #include "timers.h"
 #include "vicky_general.h"
 #include "rsrc/sprites/boot_sprites.h"
@@ -28,6 +29,8 @@
 #include <stdio.h>
 #include <string.h>
 
+#define MAX_BOOT_SRC 5
+
 const uint32_t boot_record_alignment = 8192;		// Number of bytes for boot record alignement
 const uint32_t boot_rom_location = 0xf80000;		// Location to check for a boot record in ROM
 const uint32_t boot_cart_location = 0xf40000;		// Location to check for a boot record in ROM
@@ -67,18 +70,12 @@ typedef struct boot_record_s {
 } boot_record_t, *boot_record_p;
 
 /**
- * @brief List bootable areas to check, in priority order
+ * @brief List bootable areas to check, in priority order (without RAM booting)
  * 
  */
-static enum boot_src_e boot_chain[] = {
-	BOOT_SRC_RAM,
-	BOOT_SRC_CARTRIDGE,
-	BOOT_SRC_SD0,
-	// BOOT_SRC_SD1,
-	BOOT_SRC_ROM,
-};
-
-static bool bootable[10];
+static enum boot_src_e boot_chain[MAX_BOOT_SRC];
+static bool bootable[MAX_BOOT_SRC];
+static short boot_src_cnt = 0;
 
 /**
  * @brief A holder for empty arguments list so we have something to point to when starting a binary file
@@ -265,7 +262,7 @@ static void boot_reset_screen() {
 	// txt_set_mode(0, TXT_MODE_TEXT | TXT_MODE_SPRITE);
 	*tvky_mstr_ctrl = (uint16_t)(VKY_MCR_TEXT);
 
-	tile_set_assign(0, 0, false);
+	tile_set_assign(0, 0, 0, false);
 	tile_set_update(0);
 
 	tile_map_assign(0, 0, 0, 0, 0);
@@ -374,13 +371,28 @@ static short sc_to_function(unsigned short scancode) {
  */
 void boot_screen() {
 	enum boot_src_e boot_source = BOOT_SRC_NONE;
-	boot_record_p boot_record[10];
+	boot_record_p boot_record[MAX_BOOT_SRC];
 	short boot_position = 0;
 	short bootable_count = 0;
 	short i = 0;
 	long jiffies_target = 0;
 	char message[80];
 
+	// Check the DIP switches to see if we should include RAM booting
+	// Choose the correct boot chain accordingly
+
+	i = 0;
+	boot_src_cnt = 0;
+	if ((*GABE_DIP_REG & DIP_BOOT_RAM) == 0) {
+		boot_chain[0] = BOOT_SRC_RAM;
+		i = 1;
+		boot_src_cnt++;
+	}
+	boot_chain[i++] = BOOT_SRC_CARTRIDGE;
+	boot_chain[i++] = BOOT_SRC_SD0;
+	boot_chain[i++] = BOOT_SRC_ROM;
+	boot_src_cnt += 3;
+
 	// Make sure that ANSI escape codes will be honored
 	chan_ioctrl(0, CON_IOCTRL_ANSI_ON, 0, 0);
 
@@ -403,7 +415,7 @@ void boot_screen() {
 	tile_init();
 	sprite_init();
 
-	tile_set_assign(0, (uint8_t *)boot_tiles_pixels, false);
+	tile_set_assign(0, (uint8_t *)boot_tiles_pixels, 8 * (256 + 8), false);
 	tile_set_update(0);
 
 	tile_map_assign(0, (uint16_t *)boot_tiles_map, 42, 32, 1);
@@ -425,7 +437,7 @@ void boot_screen() {
 
 	printf("Scanning for bootable devices...\n");
 
-	for (short position = 0; position < sizeof(boot_chain) / sizeof(enum boot_src_e); position++) {
+	for (short position = 0; position < boot_src_cnt; position++) {
 		bootable[position] = false;
 		boot_icon(position, boot_chain[position]);
 		if (is_bootable(boot_chain[position], &boot_record[position])) {
@@ -442,18 +454,20 @@ void boot_screen() {
 
 			// If there is a boot icon specified in the boot record, change to that icon
 			if (boot_record[position] != 0) {
-				if (boot_record[position]->icon_address != 0) {
-					sprite_assign(position, (uint8_t *)(boot_record[position]->icon_address), 0, 0);
+				// TODO: fix cartridge icon issue
+				
+				// if (boot_record[position]->icon_address != 0) {
+				// 	sprite_assign(position, (uint8_t *)(boot_record[position]->icon_address), 0, 0);
 
-					// If there is a CLUT defined for the boot record, switch to use that clut
-					if (boot_record[position]->clut_address != 0) {
-						for (i = 0; i < 4 * 256; i++) {
-							uint8_t * source_clut = (uint8_t *)boot_record[position]->clut_address;
-							VKY_GR_CLUT_2[i] = source_clut[i];
-						}
-						sprite_clut(position, 2);
-					}
-				}
+				// 	// If there is a CLUT defined for the boot record, switch to use that clut
+				// 	if (boot_record[position]->clut_address != 0) {
+				// 		for (i = 0; i < 4 * 256; i++) {
+				// 			uint8_t * source_clut = (uint8_t *)boot_record[position]->clut_address;
+				// 			VKY_GR_CLUT_2[i] = source_clut[i];
+				// 		}
+				// 		sprite_clut(position, 2);
+				// 	}
+				// }
 			}
 		}
 	}
@@ -462,7 +476,7 @@ void boot_screen() {
 	if (bootable_count > 1) {
 		printf("\nSelect a boot source:\n\n");
 
-		for (i = 0; i < sizeof(boot_chain) / sizeof(enum boot_src_e); i++) {
+		for (i = 0; i < boot_src_cnt; i++) {
 			if (bootable[i]) {
 				sprintf(message, "\e[93mF%d\e[37m-%s\n", i+1, boot_source_name(boot_chain[i]));
 				chan_write(0, (uint8_t *)message, strlen(message));
diff --git a/src/dev/sprites.c b/src/dev/sprites.c
index 99ed5fe..fa9d416 100644
--- a/src/dev/sprites.c
+++ b/src/dev/sprites.c
@@ -19,6 +19,8 @@
 
 static t_sprite sprite_shadow[SPRITE_MAX];
 
+const uint32_t sprite_ram_base = 0x000000;
+
 /**
  * @brief Update a sprite's hardware registers from the shadow registers
  * 
@@ -38,7 +40,13 @@ static void sprite_update(uint8_t sprite) {
  */
 void sprite_assign(uint8_t sprite, const uint8_t * address, uint8_t size, uint8_t layer) {
 	if (sprite < SPRITE_MAX) {
-		sprite_shadow[sprite].address = (p_far24)address;
+
+		uint8_t * sprite_mem = (uint8_t *)(sprite_ram_base + 32 * 32 * sprite);
+		for (int i = 0; i < 32 * 32; i++) {
+			sprite_mem[i] = address[i];
+		}
+
+		sprite_shadow[sprite].address = (p_far24)sprite_mem;
 		uint8_t tmp = sprite_shadow[sprite].control & 0x87;	// Mask off the size and layer bits
 		tmp |= (size & 0x03) << 5;							// Add in the new size
 		tmp |= (layer & 0x03) << 3;							// Add in the new layer
diff --git a/src/dev/tiles.c b/src/dev/tiles.c
index 36d9534..a452daf 100644
--- a/src/dev/tiles.c
+++ b/src/dev/tiles.c
@@ -7,16 +7,26 @@
 static t_tile_set tile_set_shadow[VKY_TILESET_MAX];
 static t_tile_map tile_map_shadow[VKY_TILEMAP_MAX];
 
+const uint32_t tile_set_memory_base = 0x002000;
+const uint32_t tile_map_memory_base = 0x003000;
+
 /**
  * @brief Setup a tile set
  * 
  * @param set the number of the tile set (0 - 7)
  * @param address pointer to the bitmap for the tile set
+ * @param size the number of bytes in the tile set
  * @param is_square if true, layout of image is square, if false it is 8 or 16 pixels wide
  */
-void tile_set_assign(uint8_t set, uint8_t * address, bool is_square) {
+void tile_set_assign(uint8_t set, uint8_t * address, int size, bool is_square) {
 	if (set <= VKY_TILESET_MAX) {
-		tile_set_shadow[set].address = (p_far24)address;
+
+		uint8_t * tile_set_ram = (uint8_t *)tile_set_memory_base;
+		for (int i = 0; i < size; i++) {
+			tile_set_ram[i] = address[i];
+		}
+
+		tile_set_shadow[set].address = (p_far24)tile_set_ram;
 		if (is_square) {
 			tile_set_shadow[set].control = VKY_TILESET_SQUARE;
 		} else {
@@ -55,7 +65,13 @@ void tile_init() {
  */
 void tile_map_assign(uint8_t map, uint16_t * address, uint8_t width, uint8_t height, uint8_t size) {
 	if (map <= VKY_TILEMAP_MAX) {
-		tile_map_shadow[map].address = (p_far24)address;
+
+		uint16_t * tile_map_ram = (uint8_t *)tile_map_memory_base;
+		for (int i = 0; i < width*height; i++) {
+			tile_map_ram[i] = address[i];
+		}
+
+		tile_map_shadow[map].address = (p_far24)tile_map_ram;
 		tile_map_shadow[map].width = width;
 		tile_map_shadow[map].height = height;
 		if (size == 0) {
diff --git a/src/dev/tiles.h b/src/dev/tiles.h
index f7f1c05..03c50da 100644
--- a/src/dev/tiles.h
+++ b/src/dev/tiles.h
@@ -20,9 +20,10 @@
  * 
  * @param set the number of the tile set (0 - 7)
  * @param address pointer to the bitmap for the tile set
+ * @param size the number of bytes in the tile set
  * @param is_square if true, layout of image is square, if false it is 8 or 16 pixels wide
  */
-extern void tile_set_assign(uint8_t set, uint8_t * address, bool is_square);
+extern void tile_set_assign(uint8_t set, uint8_t * address, int size, bool is_square);
 
 /**
  * @brief Update the hardware tile set from its shadow
diff --git a/src/version.h b/src/version.h
index 6f591dc..d8aba33 100644
--- a/src/version.h
+++ b/src/version.h
@@ -7,6 +7,6 @@
 
 #define VER_MAJOR 1
 #define VER_MINOR 0
-#define VER_BUILD 2
+#define VER_BUILD 4
 
 #endif