Compatibility: 1.0+
Expects: AH    08H
                                                                  
Returns: AL    character fetched from the Standard Input
                                                                  
Info: Reads (waits for) a character from the Standard Input Device,
returning that character in AL.

If Ctrl-Break is detected, INT 23H is executed.

Notes:   Call twice for Extended ASCII character input.

- -

DOS Fn 08H: No Echo Console Input