th15a.asm

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   ;8255
       org 0h

       mov   a,#80h
       mov   dptr,  #7FFFH
       movx  @dptr,a
Loop:
       mov   a, #01h
       mov   r2, #8
Output:
       mov   dptr,#7FFCH
       movx  @dptr, a
       Acall  Delay
       rl    a
       djnz  r2, Output
       ljmp  Loop

Delay:
       mov   r6, #0FFH
       mov   r7, #0FFH
DelayLoop:
       djnz  r6, DelayLoop
       djnz  r7, DelayLoop
       ret

       end