8155.asm

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       ORG 0000H
       AJMP START1
       ORG 0100H
START1: MOV SP,#30H
START: MOV  40H,#00H
       MOV A,#3
       MOV DPTR,#7F00H
       MOVX @DPTR,A
       MOV R6,#06H
       MOV R0,#6DH
       MOV A,#01H
  LD1: MOV DPTR,#7F02H
       MOVX @DPTR,A
       MOV DPTR,#7F01H
       MOV R7,A
       MOV A,R0
       MOVX @DPTR,A
       MOV R0,A
       MOV A,R7
       ACALL DELAY
       RL A
      
       
 XYG:  DJNZ R6,LD1
       AJMP START

DELAY: MOV R3,#0AH
   D1: MOV R4,#64H
   D2: MOV R5,#64H
   D3: NOP
       NOP
       NOP
       DJNZ R5,D3
       DJNZ R4,D2
       DJNZ R3,D1
       RET
       END