用汇编语言编程求10+20+30+...+500=？

        CODE  SEGMENT
              ASSUME    CS:CODE
              ORG       100H
      START:  PUSH      CS
              POP       DS
              PUSH      CS
              POP       ES
              MOV       AX,0
              MOV       BX,10
     @MAIN1:
              ADD       AX,BX
              ADD       BX,10
              CMP       BX,500
              JLE       @MAIN1
              CALL      DISPAX
              MOV       AH,4CH
              INT       21H
;================================
; 将要显示的无符号数置于 ax 中 
      DISPAX  PROC      NEAR
              PUSH      AX
              PUSH      BX
              PUSH      CX
              PUSH      DX
              PUSH      SI
              PUSH      DI
              PUSH      BP
              PUSHF
              PUSH      DS
              PUSH      CS
              POP       DS
              MOV       BYTE PTR NZ,0
              PUSH      AX
              LEA       SI,DIVARR
              MOV       CX,5
         @1:
              POP       AX
              MOV       DX,0
              MOV       BX,[SI]
              DIV       BX
              PUSH      DX
              CMP       AL,0
              JNE       @2
              CMP       BYTE PTR NZ,1
              JE        @2
              CMP       CX,1
              JE        @2
              MOV       DL,20H
              JMP       @3
         @2:
              ADD       AL,30H
              MOV       DL,AL
              MOV       BYTE PTR NZ,1
         @3:
              MOV       AH,2
              INT       21H
              INC       SI
              INC       SI
              LOOP      @1
              POP       DX
              POP       DS
              POPF
              POP       BP
              POP       DI
              POP       SI
              POP       DX
              POP       CX
              POP       BX
              POP       AX
              RET
      DIVARR  DW        10000,1000,100,10,1
          NZ  DB        0
      DISPAX  ENDP
;=========================================
        CODE  ENDS
              END       START

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