一个汇编的很简单的程序，跪求高人指点。

DATA SEGMENT
SOUR DB 64
DB 0
COUNT DW 0

DATA ENDS

CODE SEGMENT
ASSUME CS:CODE,DS:DATA

MOV DX,OFFSET SOUR
MOV AH,0AH
INT 21H

MOV AL, [SOUR+1]
MOV AH,0H
MOV [COUNT],AX

MOV CX,COUNT
DEC CX
OUTLP: MOV DX,CX
MOV BX,OFFSET SOUR
INLP: MOV AL,[BX]
CMP AL,[BX+1]
JNA NEXT

XCHG AL,[BX+1]
MOV [BX],AL
NEXT: INC BX
DEC DX
JNZ INLP
LOOP OUTLP

OUPUTING: MOV DX,OFFSET SOUR
MOV AH,09H
INT 21H
MOV AH,4CH
INT 21H
CODE EMDS
END START
这回差不多 了