Password – Sample Assembly Program

; This program will validate if the user enter a correct password

.mode small
.code
.stack
org 100h

START:
MOV AH, 07 ; use service 7 command
INT 21H
CMP AL, ‘G’ ; was the type letter = G?
JNE START ; if no start over
INT 21H ; if yes get next letter
CMP AL, ‘A’; was the type letter = A?
JNE START ; if no start over
INT 21H ; if yes get the last letter
CMP AL, ‘B’ ; was the type letter = B?
JNE START ; if no start over
FINISH:
INT 27H ; if yes terminate
END START