h13.asm

(1)完成键盘

CS0832 equ 0a000h

       mov   dptr, #CS0832
       mov   a, #0
       movx  @dptr, a
       mov   a, #40h
       movx  @dptr, a
       mov   a, #80h
       movx  @dptr, a
       mov   a, #0c0h
       movx  @dptr, a
       mov   a, #0ffh
       movx  @dptr, a
       ljmp  $
       end