2.asm

1. 设计要求： 1．彩色界面

          ;FILENAME:2.ASM
.486
        DISP  MACRO     NNN
              MOV       AH,0EH
              MOV       AL,NNN
              INT       10H
              ENDM
        DATA  SEGMENT   USE16
        MESG  DB        'Please input 4 hex numbers:',0DH,0AH,'$'
       MESG1  DB        'Input error!$'
      BINARY  DW        0
        DATA  ENDS
        CODE  SEGMENT   USE16
              ASSUME    CS:CODE,DS:DATA
        BEG:  MOV       AX,DATA
              MOV       DS,AX
              MOV       AH,9
              MOV       DX,OFFSET MESG
              INT       21H
              MOV       CH,4
    WAIT_IN:  MOV       AH,08H
              INT       21H
              MOV       BL,AL
              CMP       AL,'0'
              JL        ERROR       ;非法键入转
              CMP       AL,'9'
              JA        NEXT1
              JMP       NEXT2
      NEXT1:  CMP       AL,'A'
              JL        ERROR       ;非法键入转
              CMP       AL,'F'
              JG        ERROR       ;非法键入转
              SUB       BL,7
      NEXT2:  SUB       BL,30H      ;生成二进制数
              DISP      AL          ;显示位代码
              SAL       BL,4
              MOV       CL,4
      LAST1:  SAL       BL,1
              RCL       BINARY,1    ;生成二进制数
              DEC       CL
              JNZ       LAST1
              DEC       CH
              JNZ       WAIT_IN
              DISP      'H'         ;显示'H'
              DISP      '='         ;显示'='
      DISP2:  MOV       BP,BINARY
              MOV       CX,16
      LAST3:  MOV       AL,'0'
              RCL       BP,1
              JNC       NEXT3
              MOV       AL,'1'
      NEXT3:  DISP      AL
              LOOP      LAST3
              DISP      'B'
              MOV       AH,4CH
              INT       21H
      ERROR:  DISP      AL
              DISP      0AH
              MOV       AH,9
              MOV       DX,OFFSET MESG1
              INT       21H
              MOV       AH,4CH
              INT       21H
        CODE  ENDS
              END       BEG