first asm

assume cs: codesg

codesg segment

mov ax,0123H
mov bx,0456H
add ax,ax
add ax,ax

mov ax,4c00H
int 21H

codesg ends

end

 

.data



.stack



.code

main proc

   mov cx,3 

   call sub1 

   mov ax, 4c00h ; exit to operating system.

   int 21h

main endp



sub1 proc

    mov ax,1

    call sub2

    ret

sub1 endp    



sub2 proc

    mov bx,2    

    ret

sub2 endp



end main