4-15.asm

基于汇编语言的几个微机接口程序

4-15题



DSEG    SEGMENT 'DATA'
      ; add your data here!
      MBUF DB 10H,20H,30H,40H,50H
      NBUF DB 5 DUP(?)
      
DSEG    ENDS

SSEG    SEGMENT STACK   'STACK'
      db   256  DUP(0)
SSEG    ENDS

CSEG    SEGMENT 'CODE'
   START   PROC    FAR
      ; set segment registers:
      MOV AX, DSEG
      MOV DS, AX
      MOV ES, AX
      
      
      MOV SI,OFFSET MBUF
      ADD SI,04H
      MOV DI,OFFSET NBUF
      MOV CX,05H
      
      
LOP:   
      MOV AL,[SI]
      DEC SI
      MOV [DI],AL
      INC DI
      MOV BL,AL
      
      LOOP LOP
   
      ; add your code here



      MOV AX, 4C00h ; exit to operating system.
      INT 21h    
   START   ENDP
CSEG    ENDS
END    START    ; set entry point.