;this program waits for user input. if the user presses '1' it outputs a string, if '2' it exits
.model small
.stack 100h
.data

doHz = 2280
pause dw ?
pause1 dw ?

.code      
init:   mov ax,@data       ;initialize data sector
        mov ds,ax
        mov ax,3           ;initialize video mode: text
        int 10h
        
        mov ax,doHz
        out 42h,al         ;set sound to DO
        mov al,ah
        out 42h,al
        
        in al,61h
        OR al,00000011     ;set 61h port to output sound
        out 61h,al
        
        call wait1
fin:
mov ah,4ch                ;return control to OS
    int 21h
;*******************
wait1: mov pause,0ffffh
agn1:  mov pause1,0ffffh
agn2:  dec pause1
       jnz agn2
       dec pause
       jnz agn1
   ret
end