old/ASM/12h/12h.asm

.286
.model small
.code
org 100h
start:
	mov ax, 12h
	int
	 10h

	mov cx, 0fh
gg:	


	mov ax, 100
	mov bx, cx
	call putpixel
	inc ax
	inc bx
	call putpixel
	loop gg

	mov ah, 08h
	int 21h
	mov ax, 03
	int 10h

	mov ax, 4ch
	int 21h

putpixel proc near
	pusha
    push es
    mov di, cx
	push 0a000h
	pop es

	push bx
	mov cl, 6
	shl bx, cl
	pop dx
	shl dx, 4
	add bx, dx
	push ax
	shr ax, 3
	add bx, ax
	pop ax
    and ax, 7
	mov cl, 7
    sub cl, al
    mov ax, 1
    shl ax, cl
    mov m1, al
	mov offs, bx
    xor cx, cx
puts:
	mov dx, 3ceh
	mov ax, 5
	out dx, ax
	mov dx, 3c4h
	mov ax, 100h
	shl ax, cl
	add ax, 2
	out dx, ax

	mov si, offs
    mov al, es:[si]

	mov bx, 1
	shl bx, cl
	test di, bx
    jz	nwrt
    or al, m1
    jmp myout
nwrt:
	mov bl, m1
	not bl
    and al, bl
myout:
    mov es:[si], al
	mov dx, 3c4h
	mov ax, 0F02h
	out dx, ax
	inc cl
	cmp cl, 4
	jnz puts  

	pop es
	popa
	ret
m1		db ?
offs	dw ?
endp
end start