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INT 21 - DOS 1+ - READ CHARACTER FROM STANDARD INPUT, WITH ECHO

      AH = 01h

Return: AL = character read Notes: ^C/^Break are checked, and INT 23 executed if read

      ^P toggles the DOS-internal echo-to-printer flag
      ^Z is not interpreted, thus not causing an EOF if input is redirected
      character is echoed to standard output
      standard input is always the keyboard and standard output the screen
        under DOS 1.x, but they may be redirected under DOS 2+

SeeAlso: AH=06h,AH=07h,AH=08h,AH=0Ah