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Int 21 Fn 03  - DOS 1+ - Read Character From Stdaux                        [D]

   AH = 03h

Return: AL = character read

Notes: keyboard checked for  Break, and INT 23 executed if detected
   STDAUX is usually the first serial port

See Also: AH=04h,INT 14/AH=02h,INT E0/CL=03h
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