15.asm

微机原理与接口技术的部分课后题（十几题经典的）程序

DATA SEGMENT
  MBUF DB 05H,06H,07H,08H,09H
  NBUF DB 5 DUP(0)
  TS1 DB 'The original order is:','$'
  TS2 DB 'The reverse order is:','$'
DATA ENDS
CODE SEGMENT
  ASSUME CS:CODE,DS:DATA
START:  MOV AX,DATA
        MOV DS,AX
	MOV SI,04H		
	MOV DI,00H	
	MOV CX,5
L1:     MOV AL,MBUF[SI]		;将MUBF中的值移到NBUF
	MOV NBUF[DI],AL
	DEC SI			;MBUF中倒序，NBUF中正序放值
	INC DI
	LOOP L1
	MOV CX,5		;循环读取次数
	MOV SI,00H
	LEA DX,TS1		;显示提示字符串
	MOV AH,9
	INT 21H
L2:     MOV AL,MBUF[SI]		
	ADD AL,30H		;转ASCII码
	MOV DL,AL
	MOV AH,02H		;显示原来的次序
	INT 21H
	INC SI
	LOOP L2
	MOV DL,0DH		;回车
	MOV AH,02H
	INT 21H
	MOV DL,0AH		;换行
	MOV AH,02H
	INT 21H
	MOV CX,5		;重新赋值，用于读取NBUF中的数个数
	MOV SI,00H
	LEA DX,TS2		;显示提示字符串
	MOV AH,9
	INT 21H
L3:     MOV AL,NBUF[SI]		;转ASCII码
	ADD AL,30H
	MOV DL,AL
	MOV AH,02H		;显示倒排后的顺序
	INT 21H
        INC SI
	LOOP L3
	MOV AH,4CH		;返回操作系统
	INT 21H
CODE ENDS
  END START