简单的汇编语言编程，求如何做

溢出时的高位自动舍弃了，就你这样就可以的。转化为完整的程序为:

        CODE  SEGMENT
              ASSUME    CS:CODE
        BUF1  DB        1,2,3,4,5,6,7,8
        BUF2  DB        8 DUP('?')
      START:  PUSH      CS
              POP       DS
              PUSH      CS
              POP       ES
              LEA       SI, BUF1
              LEA       DI, BUF2
              MOV       CX, 8
      NEXT1:  MOV       AL, [SI]
              MOV       BL, 3
              MUL       BL
              MOV       [DI+7], AL
              INC       SI
              DEC       DI
              LOOP      NEXT1
              MOV       AH,4CH
              INT       21H
        CODE  ENDS
              END       START