Int 14H Function 02H
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Description: Read Character from Communications Port [PC] [AT] [PS/2]
Reads a character from the specified serial communications port, also
returning the port's status.
Input Output
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AH=02H If function successful
DX=communications port number AH bit 7=0
(0=COM1, 1=COM2, etc.) AH bits 0-6=status
Bit(s) Significance (if set)
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4 break detected
3 framing error detected
2 parity error detected
1 overrun error detected
AL=character
If function unsuccessful (timed-out)
AH bit 7=1
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