Beautiful... ain't she?

main.asm

@@ -4,6 +4,19 @@
 
 section KERNEL follows=BOOTSECTOR vstart=1000h
 
+%macro mod 2
+    push ax
+    push cx
+    
+    mov cx, %2
+    xor dx, dx
+    mov ax, %1
+    div cx
+
+    pop cx
+    pop ax
+%endmacro
+
 main:
     mov ax, 0x0013
     int 0x10
@@ -15,18 +28,16 @@ main:
     mov di, 0
 
     mov bx, 0
-    .c:
-        add bl, 1
+    .r:
+        add bx, 1
         .f:
             mov byte [es:di], bl
             add di, 1
-            cmp di, 0xFFFF
+            mod di, 320
+            cmp dx, 0
             jnz .f
-        push bx
-        mov bx, 100
-        call sleep
-        pop bx
-    jmp .c
+        cmp bx, 200
+        jnz .r
 
     pop es