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INT 14 - SERIAL - READ CHARACTER FROM PORT
        AH = 02h
        DX = port number (00h-03h (04h-43h for Digiboard XAPCM232.SYS))
Return: AH = line status (see AH=03h)
        AL = received character if AH bit 7 clear
Note:   will timeout if DSR is not asserted, even if function 03h returns
          data ready
SeeAlso: AH=02h"FOSSIL",AH=84h,AH=FCh

See Also: 1401
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