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read_char ()

     Usage: Read a keystroke from the keyboard buffer (if one is
            available).  This function always returns immediately,
            with or without a valid key (see below).

Parameters: None

   Returns: The ASCII value .int. of the keystroke in the low order
            byte, and the scan code in the high order byte. If no
            keystroke is available, -1 is returned. If the character
            was a special function code, the low order byte is 0 and
            the scan code is in the high order byte (see IBM Technical
            Reference or use the key macro to get scan codes).