org 0x100 ; in al,0x61 ; or al,3 mov al,3 out 0x61,al ;les bp,[bx] push 0xA000 pop es mov al,0x13 int 0x10 ; mov al,0xB6 ; out 0x43,al here: mov ax,cx xor al,ch and al,00111000b stosb loop here mov ax,di and al,00001111b out 0x42,al add di,0x3F jmp here