diff --git a/linker-files/linker.scm b/linker-files/linker.scm
index a359652..8df2b9e 100644
--- a/linker-files/linker.scm
+++ b/linker-files/linker.scm
@@ -4,12 +4,11 @@
 	(memory firstPage (address (#x100 . #x1ff)) (section stack))
     (memory reserved (address (#x200 . #x7ff)) (type ram))
 	(memory program (address (#x801 . #x1fff)) (type ram)
-        (section (programStart #x801) (startup #x80e) code))
+		(section (programStart #x801) (startup #x80e) code switch idata cdata data_init_table))
+;;;		(section (programStart #x801) (startup #x80e) code))
 	(memory displayPage1 (address (#x2000 . #x3fff)) (type ram))
-;;;	(memory datamem (address (#x4000 . #x91ff)) (type ram) (section cstack zdata heap)) ;;; usermem goes from 0x4000 to 0x9FFFF (included), we are splitting it
-;;;	(memory upperData (address (#x9200 . #x9fff))  (section switch idata cdata data data_init_table))
 	(memory datamem (address (#x4000 . #x91ff)) (type ram) (section cstack zdata data heap)) ;;; usermem goes from 0x4000 to 0x9FFFF (included), we are splitting it
-	(memory upperData (address (#x9200 . #x9fff))  (section switch idata cdata data_init_table))
+	;;;(memory upperData (address (#x9200 . #x9fff)) (type ram) (section switch idata cdata data_init_table))
 	(memory displayPage2 (address (#xa000 . #xbfff)) (type ram))
 	(memory io (address (#xc000 . #xc0ff)) (type ram))
 	(memory rombank (address (#xc100 . #xffff)) (type rom))
diff --git a/src/game_graphics.c b/src/game_graphics.c
index fb7e17b..e8fbb59 100644
--- a/src/game_graphics.c
+++ b/src/game_graphics.c
@@ -8,17 +8,17 @@
 #include "game_logic.h"
 
 #define SCREEN_WIDTH_B 40
-#define TILE_SIDE 28
+#define TILE_SIDE 35
 
-#define TOP_OFFSET 14 // Top is offset by 14 lines
+#define TOP_OFFSET 11 // Top is offset by 11 lines
 #define LEFT_OFFSET_B 1 // Left is offset by 1 bytes (7 pixels)
 
 static uint8_t *front_buf = (uint8_t*)DISPLAY_PAGE_1;
 static uint8_t *back_buf = (uint8_t*)DISPLAY_PAGE_1;
 
 // The grid is 5x5 squares,
-// It is offset on the left side by 7 pixels and on the top by 14
-// Every square is 28x28 pixels
+// It is offset on the left side by 7 pixels and on the top by 11
+// Every square is 35x35 pixels
 
 void swap_display_buffers(void);
 
@@ -27,19 +27,15 @@ void draw_game_background(void) {
 	uint8_t* buf = (uint8_t*)DISPLAY_PAGE_1;
 	
 	// Horizontal borders
-	for(uint8_t col = 0; col < GRID_SIDE * 4; col++) {
+	for(uint8_t col = 0; col < GRID_SIDE * 5; col++) {
 		buf[line_offset_map[TOP_OFFSET] + col + LEFT_OFFSET_B] = 0x7F;
 		buf[line_offset_map[TOP_OFFSET + (TILE_SIDE * GRID_SIDE)] + col + LEFT_OFFSET_B] = 0x7F;		
 	}
 
-	// vertical borders
-	for(uint8_t col = 0; col < GRID_SIDE * 4; col++) {
-		buf[line_offset_map[TOP_OFFSET] + col + LEFT_OFFSET_B] = 0x7F;
-		buf[line_offset_map[TOP_OFFSET + (TILE_SIDE * GRID_SIDE)] + col + LEFT_OFFSET_B] = 0x7F;		
-	}
+	// TODO vertical borders
 
 	// Copy the data from display page 1 to 2
-	memcpy((void*)DISPLAY_PAGE_1, (void*)DISPLAY_PAGE_2, DISPLAY_PAGE_SIZE);
+	memcpy((void*)DISPLAY_PAGE_2, (void*)DISPLAY_PAGE_1, DISPLAY_PAGE_SIZE);
 	
 }
 
diff --git a/src/input.c b/src/input.c
index 81acefc..61a5d7b 100644
--- a/src/input.c
+++ b/src/input.c
@@ -3,18 +3,34 @@
 #include "utility.h"
 #include "mem_registers.h"
 
-key read_kb(void) {	
+key __internal_read_kb(void);
+
+inline key __internal_read_kb(void) {
+	PEEK(IO_KB_CTRL_LOW);
+	
 	POKE(IO_DATAOUT, 0x40);
-	if (PEEK(IO_DATAIN) & DATAIN_KB_MASK) return K_UP;
+	if (PEEK(IO_DATAIN) & 0x01) return K_UP;
 	
 	POKE(IO_DATAOUT, 0x20);
-	if (PEEK(IO_DATAIN) & DATAIN_KB_MASK) return K_DOWN;
+	if (PEEK(IO_DATAIN) & 0x01) return K_DOWN;
 	
 	POKE(IO_DATAOUT, 0x10);
-	if (PEEK(IO_DATAIN) & DATAIN_KB_MASK) return K_RIGHT;
+	if (PEEK(IO_DATAIN) & 0x01) return K_RIGHT;
 	
 	POKE(IO_DATAOUT, 0x08);
-	if (PEEK(IO_DATAIN) & DATAIN_KB_MASK) return K_LEFT;
+	if (PEEK(IO_DATAIN) & 0x01) return K_LEFT;
 	
-	return K_NONE;
+	return K_NONE;	
+}
+
+key read_kb(void) {
+	static key last_press = K_NONE;
+	key cur_press = __internal_read_kb();
+	
+	if (cur_press != last_press) {
+		last_press = cur_press;
+		return cur_press;
+	} else {
+		return K_NONE;
+	}
 }
diff --git a/src/main.c b/src/main.c
index fea5e48..3eeb290 100644
--- a/src/main.c
+++ b/src/main.c
@@ -9,11 +9,12 @@
 #include "input.h"
 #include "game_logic.h"
 #include "game_graphics.h"
+#include "monitor_subroutines.h"
 
-void __low_level_init(void);
+void init(void);
 
 // Low level initialization
-void __low_level_init(void) {
+void init(void) {
 	POKE(P3_PWRDUP, 0); // Dirty the value checked by the reset vector
 	PEEK(IO_ROMSEL); // Make sure the ROM is selected
 	
@@ -26,6 +27,8 @@ void __low_level_init(void) {
 }
 
 __task int main(void) {
+	init();
+		
 	game_state state;
 		
 	while(1){ // Outer loop
@@ -37,15 +40,19 @@ __task int main(void) {
 		
 			switch(read_kb()) {
 				case K_UP:
+					BELL1();
 					state = step_game(UP);
 					break;
 				case K_DOWN:
+					BELL1();
 					state = step_game(DOWN);
 					break;
 				case K_LEFT:
+					BELL1();
 					state = step_game(LEFT);
 					break;
 				case K_RIGHT:
+					BELL1();
 					state = step_game(RIGHT);
 					break;
 				default:
@@ -62,6 +69,6 @@ __task int main(void) {
 		}
 
 	};
-		
+	
 	return 0; 
 }
diff --git a/src/tk2k_startup.s b/src/tk2k_startup.s
index 0092cfa..4530af4 100644
--- a/src/tk2k_startup.s
+++ b/src/tk2k_startup.s
@@ -87,10 +87,10 @@ __call_heap_initialize:
 ;;;
 ;;; ***************************************************************************
 
-;;;              .section code
-;;;              .pubweak __low_level_init
-;;;__low_level_init:
-;;;              rts
+              .section code
+              .pubweak __low_level_init
+__low_level_init:
+              rts
 
 ;;; ***************************************************************************
 ;;;