.MODEL SMALL
        .DATA
MESSAGE DB "You pressed:$"
        .CODE
        .STARTUP

        ;Read the keys with echo until ESC key is pressed
        ;Print a message each time
LABEL1: mov ah, 9       ; Select function 9, print a string
        mov dx, OFFSET MESSAGE
        int 21h         ; Interrupt 21h (DOS functions)

        ;Read the key
        mov ah, 01      ; Select function 1, read a key with echo
        int 21h         ; Interrupt 21h (DOS functions)
        ;The program wait for a keypress before reaching this point


        cmp al,1BH      ; Compare to ESC code (ASCII)
        jne LABEL1      ; If not ESC - continue
        .EXIT
        END