STACK SEGMENT PARA STACK 'STACK'
          DW 100 DUP (?)
STACK ENDS
DATA SEGMENT
         ORG  0100H
         MCD1_HI DW  1234H                        ;被乘數(shù)
         MCD1_LO DW  5678H
         MCD2_HI DW  0ABCDH                       ;乘數(shù)
         MCD2_LO DW  0EF12H
         RESULT DB 8 DUP(0)                       ;結果區(qū)(低位字節(jié)在前)
DATA ENDS
CODE SEGMENT
ASSUME CS:CODE,DS:DATA
MUL32B_S PROC FAR
         PUSH DS                        ;保存返回地址
         MOV  AX, 0
         PUSH AX
         MOV  AX,DATA                   ;初始化DS,ES
         MOV  DS,AX
         MOV  DX,MCD1_HI                ;DX存儲被乘數(shù)的高8位
         MOV  AX,MCD1_LO                ;AX存儲被乘數(shù)的低8位
         MOV  CX,MCD2_HI                ;CX存儲乘數(shù)的高8位
         MOV  BX,MCD2_LO                ;DX存儲乘數(shù)的低8位


         MOV  DI,OFFSET RESULT
         MOV  MCD1_HI,DX
         MOV  MCD1_LO,AX
         MUL  BX                         ;產(chǎn)生部分積1
         ADD  [DI],AX
         ADC  [DI+2],DX
         MOV  AX,MCD1_HI
         MUL  BX                         ;產(chǎn)生部分積2
         ADD  [DI+2],AX
         ADC  [DI+4],DX
         MOV  AX,MCD1_LO
         MUL  CX                         ;產(chǎn)生部分積3
         ADD  [DI+2],AX
         ADC  [DI+4],DX
  
         MOV  AX,MCD1_HI
         MUL  CX                         ;產(chǎn)生部分積4
         ADD  [DI+4],AX
         ADC  [DI+6],DX

     RET
    MUL32B_S ENDP
    CODE ENDS
    END MUL32B_S                         ;匯編結束