code segment

assume cs:code

sum_p proc near

jcxz exit

add ax,cx

dec cx

call sum_p

exit: ret

sum_p endp

start: mov ax,2000h

mov ds,ax

mov ax,0

mov si,0

mov cx,7

call sum_p

mov [si],ax

mov ah,4ch

int 21h

code ends

end start