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  Interrupt:   21h     Functions:  01h, 07h, and 08h
 
  Title:       Character Input
 
  See also:    ASCII Chart, Extended Key Codes, Direct Console I/O,
               Read Character from Keyboard, Buffered Keyboard Input,
               Read File or Device, @GetChar
 
  Description:
 
     Reads a character from the standard input device. If no character
     is ready, the function waits until one is available. Input can be
     redirected. However, if input has been redirected, there is no
     way to detect EOF.
 
     Input                                    Output
 
     AH = 01h for filtered with echo          AL = 8-bit input data
        = 07h for unfiltered without echo
        = 08h for filtered without echo
                                    -♦-