用汇编编写DOS下的内存驻留程序(3)：中断矢量

p;    ;Save offset temporarily
    mov     dx,es                   ;Move segment to DX
    call    dsword                  ;Display segment
    call    dcolon                  ;Print a ";"
;          call    dcrlf
    pop     dx                      ;Restore offset to DX
    call    dsword                  ;Display offset
    ret
   ddword  endp
   ;----------------------------------------------------------------------------
   ;DX containes single word to be displayed
   ;----------------------------------------------------------------------------
   dsword  proc    near
    push    dx                      ;Save low byte temporarily
    mov     dl,dh                   ;Move high byte to low byte
    call    dbyte                   ;Display high byte
    pop     dx                      ;Restore low byte to DL
    call    dbyte                   ;Display low byte
    ret
   dsword  endp
   ;----------------------------------------------------------------------------
   ;DL contains byte to be displayed
   ;----------------------------------------------------------------------------
   dbyte   proc    near
    push    ax                      ;Save any registers used
    push    dx                     
  &nbs