call    temp
        jmp     short >a1
        db      "this is a test$"
a1:     ret     ;to operating system
temp:   pop     dx      ;get address of string
        push    dx      ;but re-save return address
        add     dx,2    ;skip JMP SHORT
        mov     ah,9    ;DOS function
        int     21h     ;do it
        ret     ;now return