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tandyBW.asm

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cpu 8086

org 100h

push ds

push es

mov ax, 40h

mov ds, ax

mov ax, [10h]

;and ax, 0FFCFh

or ax, 30h

mov [10h], ax

xor ax, ax

mov es, ax

mov bx, 74h

mov ax, 0E000h

mov [es:bx], ax

mov ax, 0F000h

mov [es:bx+2], ax

mov ax, 1

int 10h

mov bx,[10h]

and bx, 30h

mov al, 7

cmp bl, 30h

jz short l19

mov al, 2

cmp bl, 20h

jz short l19

mov al, 0

l19:

int 10h

pop es

pop ds

ret