键盘输入2位十六进制数，屏幕输出对应的十进制数和二进制数，要求二者在同一行显示，以2个空格作为分隔符，在下一行显示该十六进制数交换后的值，完成程序
（附带解释更好）
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[此贴子已经被作者于2018-6-16 07:55编辑过]

求大神回复

如果楼主早一年注册,贴子(不是纯灌水)超过30,我会无偿给你解答.
或者
楼主至少有一个思路,写了若干代码却卡在什么地方,我也会无偿给你解答.

CODE  SEGMENT
              ASSUME    CS:CODE
 
        BUFF  DB        3,?,3 DUP(?)
        ERRR  DB        13,10,'error $'
        LFCR  DB        13,10,'$'
 
      START:  PUSH      CS
              POP       DS
              PUSH      CS
              POP       ES
         @0:
              MOV       AH,10
              LEA       DX,BUFF
              INT       21H
 
              LEA       SI,BUFF
              MOV       CL,[SI+1]
              MOV       CH,0
              CLD
              ADD       SI,2
              MOV       BL,0
         @1:
              LODSB
              CMP       AL,'0'
              JB        @10
              CMP       AL,'9'
              JBE       @9
              CMP       AL,'A'
              JB        @10
              CMP       AL,'F'
              JBE       @8
              CMP       AL,'a'
              JB        @10
              CMP       AL,'f'
              JBE       @7
              JMP       @10
         @7:
              SUB       AL,'a'
              ADD       AL,10
              JMP       @11
         @8:
              SUB       AL,'A'
              ADD       AL,10
              JMP       @11
         @9:
              SUB       AL,'0'
              JMP       @11
        @10:
              LEA       DX,ERRR
              MOV       AH,9
              INT       21H
              JMP       @0
        @11:
              ROL       BL,1
              ROL       BL,1
              ROL       BL,1
              ROL       BL,1
              ADD       BL,AL
              LOOP      @1
              MOV       AL,BL
              MOV       AH,0
              PUSH      AX
              PUSH      AX
               
              MOV       AH,9
              LEA       DX,LFCR
              INT       21H
 
              POP       AX
              CALL      DSPAX10
              POP       AX
              CALL      DSPAX2
               
              MOV       AH,4CH
              INT       21H
;================================   
      DSPAX2  PROC      NEAR
              PUSH      AX
              PUSH      BX
              PUSH      CX
              PUSH      DX
              PUSHF
              XOR       CX,CX
              MOV       BX,2
  @DSPAX2_1:
              XOR       DX,DX
              DIV       BX
              INC       CX
              OR        DX,30H
              PUSH      DX
              CMP       AX,0
              JNE       @DSPAX2_1
              MOV       AH,2
 @DISPAX2_2:
              POP       DX
              CMP       DL,3AH
              JB        @DISPAX2_3
              ADD       DL,7
 @DISPAX2_3:
              INT       21H
              LOOP      @DISPAX2_2
              MOV       DL,32
              INT       21H
              POPF
              POP       DX
              POP       CX
              POP       BX
              POP       AX
              RET
      DSPAX2  ENDP
;================================   
     DSPAX10  PROC      NEAR
              PUSH      AX
              PUSH      BX
              PUSH      CX
              PUSH      DX
              PUSHF
              XOR       CX,CX
              MOV       BX,10
 @DSPAX10_1:
              XOR       DX,DX
              DIV       BX
              INC       CX
              OR        DX,30H
              PUSH      DX
              CMP       AX,0
              JNE       @DSPAX10_1
              MOV       AH,2
            @DISPAX10_2:
              POP       DX
              CMP       DL,3AH
              JB        @DISPAX10_3
              ADD       DL,7
            @DISPAX10_3:
              INT       21H
              LOOP      @DISPAX10_2
              MOV       DL,32
              INT       21H
              POPF
              POP       DX
              POP       CX
              POP       BX
              POP       AX
              RET
     DSPAX10  ENDP
;================================              
        CODE  ENDS
              END       START





注释：要求是“以两个空格作为间隔”该程序是一个空格；
最后一句，“在下一行显示该十六进制数交换后的值”，该程序没有编辑。
要求举例：
输入：3A
输出：A3


速回谢谢！！！

照看,这不是楼主写的代码,不符我希望提问者自己写的要求.
嗯,好吧,只此一次,下不为例.


删除            

 POP       AX

 CALL      DSPAX2

改为

          MOV       DL,20H  
          MOV     AH,2
              INT    21H 
              POP       AX
              CALL      DSPAX2
              MOV       AH,9
              LEA       DX,LFCR
              INT       21H
          LEA       BX,BUFF+2 
              MOV    AX,[BX]
              XCHG     AH,AL
          MOV     WORD PTR LFCR,AX
              MOV       AH,9
              LEA       DX,LFCR
              INT       21H

感谢大神，我肯定好好努力