Ejemplo de Programa en Lenguaje Ensamblador

Este ejemplo realiza la siguiente accion: Escribe un programa que imprima X en la pantalla hasta que se presione ESC.

name "keybrd"

org 100h

; print a welcome message:

mov dx, offset msg

mov ah, 9

int 21h ;

============================

; eternal loop to get ;

and print keys:

wait_for_key:

; check for keystroke in

; keyboard buffer:

mov dh, pos

mov dl, pos

mov bh, 0

mov ah, 2

int 10h ;

mov al,'X'

mov bh,0

mov bl,1

mov cx,1

mov ah,09h

inc pos ;

int 10h

mov ah, 1

int 16h

jz wait_for_key

; get keystroke from keyboard:

; (remove from the buffer)

mov ah, 0

int 16h ;

print the key:

mov ah, 0eh

int 10h ;

cmp al, 1bh

jz exit

jmp wait_for_key

;============================

exit:

ret msg db "Type anything...", 0Dh,0Ah

db "[Enter] - carriage return.", 0Dh,0Ah

db "[Ctrl]+[Enter] - line feed.", 0Dh,0Ah

db "You may hear a beep", 0Dh,0Ah

db " when buffer is overflown.", 0Dh,0Ah

db "Press Esc to exit.", 0Dh,0Ah, "$"

pos db 1

end