diff --git a/Part2/.DS_Store b/Part2/.DS_Store
index 54fa1b0..9863d6d 100644
Binary files a/Part2/.DS_Store and b/Part2/.DS_Store differ
diff --git a/Part2/A4/.DS_Store b/Part2/A4/.DS_Store
index c628423..b903815 100644
Binary files a/Part2/A4/.DS_Store and b/Part2/A4/.DS_Store differ
diff --git a/Part2/A4/02_driver/.DS_Store b/Part2/A4/02_driver/.DS_Store
index 3fb9b9f..807eff9 100644
Binary files a/Part2/A4/02_driver/.DS_Store and b/Part2/A4/02_driver/.DS_Store differ
diff --git a/Part2/A4/02_driver/kernel/kernel.c b/Part2/A4/02_driver/kernel/kernel.c
index 050e51c..fc85bf5 100755
--- a/Part2/A4/02_driver/kernel/kernel.c
+++ b/Part2/A4/02_driver/kernel/kernel.c
@@ -9,11 +9,11 @@ void _start() {
     position = position << 8; /* high byte */
 
     port_byte_out(0x3d4, 15); /* requesting low byte */
-    position += port_byte_in(0x3d5);
+    position += port_byte_in(0x3d5) + 250;
 
     /* VGA 'cells' consist of the character and its control data
      * e.g. 'white on black background', 'red text on white bg', etc */
-    int offset_from_vga = position * 2.3;
+    int offset_from_vga = position * 2;
 
     /* Now you can examine both variables using gdb, since we still
      * don't know how to print strings on screen. Run 'make debug' and
@@ -27,6 +27,6 @@ void _start() {
     /* Let's write on the current cursor position, we already know how
      * to do that */
     char *vga = (char *) 0xb8000;
-    vga[offset_from_vga+10] = 'X';
-    vga[offset_from_vga+11] = 0x0f; /* White text on black background */
+    vga[offset_from_vga] = 'X';
+    vga[offset_from_vga+1] = 0x0f; /* White text on black background */
 }
diff --git a/Part2/A4/06_irq/.DS_Store b/Part2/A4/06_irq/.DS_Store
index b23acb6..ef1b06b 100644
Binary files a/Part2/A4/06_irq/.DS_Store and b/Part2/A4/06_irq/.DS_Store differ