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Int 14 Fn 02 - Serial - Read Character From Port [S]
AH = 02h
AL = 00h (ArtiCom)
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
Notes: will timeout if DSR is not asserted, even if function 03h returns
data ready
various network and serial-port drivers support the standard BIOS
functions with interrupt-driven I/O instead of the BIOS's polled I/O
the 04/08/93 Compaq system ROM uses only the low two bits of DX
See Also: AH=01h,AH=02h"FOSSIL",AH=84h,AH=FCh
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