bits 16
	org 100h

start:
	; call video bios (10h) to set video mode (call 00h), to mode
	; 13h (320x200 8bpp).
	mov ax, 13h	; call number in ah (0), call argument in al (13h)
	int 10h		; call video bios

	; setup es to access the framebuffer segment (a000h)
	push word 0a000h
	pop es

	; prepare to fill the framebuffer with red (default palette color 4)
	mov eax, 04040404h	; value to store each time
	mov ecx, 16000	; framebuffer size in 32bit units (320x200/4 = 16000)
	xor di, di	; start from offset 0
	rep stosd	; repeat (while ecx != 0) the "store string dword" instr.

.mainloop:
	in al, 60h	; read pending scancode from the keyboard port (if any)
	dec al		; ESC is 1, so decrement ...
	jnz .mainloop	; ... and loop as long as the result was not 0

	; switch back to text mode (mode 3)
	mov ax, 3
	int 10h

	; return to dos
	ret