Pseudorandom black and white pattern in DOS

README.md

Compile via NASM:

nasm.exe pattern.asm -fbin -o pattern.com

PATTERN.ASM

	org	100h

section .text

entry:	mov	ax,0x13
	int	0x10
	mov	di, 0xA000
	mov	es, di
	xor	di, di
	mov	cx, 0xfa00
loop:	add	bx, 0xf7ef	
	mov	al,bl
	mul	bh
	mov	dx,di
	ror	dx,6
	add	ax,dx
	and	ax,1
	dec	ax
	and	ax, 0xf
	mov	es:[di],al
	ror	bx,6
	inc	di
	dec	cx
	jnz	loop
	mov	ah,0
	int	0x16
	mov	ax,0x03
	int	0x10
	int	0x20

section .data

section .bss