15.asm

微机编程小题

DATA  SEGMENT
      MBUF DB 00H,22H,44H,66H,88H
      COUNT EQU $-MBUF
      ORG 0040H
      NBUF DB COUNT DUP(0)
DATA  ENDS
STACK1 SEGMENT PARA STACK
      DW 40 DUP(?)
STACK1 ENDS
CODE  SEGMENT
      ASSUME CS:CODE,DS:DATA,SS:STACK1
START:MOV AX,DATA
      MOV DS,AX                     ;DS装入段基址
      MOV BX,OFFSET MBUF
      ADD BX,COUNT-1
      MOV SI,OFFSET NBUF
      MOV CX,COUNT
SAVE:MOV AL,[BX]
     MOV [SI],AL
     DEC BX
     INC SI
     DEC CX
     JNZ SAVE                        ;不等于0转SAVE
     MOV AH,4CH                      ;系统功能调用
     INT 21H                         ;返回操作系统
CODE  ENDS
      END START