3.asm

好东西！！自家漫漫的研究

CODE SEGMENT
     ASSUME CS:CODE,DS:CODE 
START:JMP BEGIN
      BUF DB 128 DUP (0)
BEGIN:MOV AX,CS
      MOV DS,AX
      MOV SI,0
    S:MOV AH,01H
      INT 21H
      CMP AL,0DH
      JZ L
      MOV BUF[SI],AL
      INC SI
      CMP SI,127
      JA L
      JMP S
    L:MOV CX,SI
      MOV SI,0
    H:MOV DL,BUF[SI]
      CMP DL,61H
      JB A20
      CMP DL,7AH
      JA A20
      AND DL,11011111B
    A20:MOV AH,02H
        INT 21H
        INC SI
        LOOP H
        MOV AH,4CH
        INT 21H
CODE ENDS
     END START