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INT 14 - SERIAL - GET PORT STATUS
        AH = 03h
        DX = port number (00h-03h) (04h-43h for Digiboard XAPCM232.SYS)
Return: AH = line status
            bit 7: timeout
                6: transmit shift register empty
                5: transmit holding register empty
                4: break detected
                3: framing error
                2: parity error
                1: overrun error
                0: receive data ready
        AL = modem status
            bit 7: carrier detect
                6: ring indicator
                5: data set ready
                4: clear to send
                3: delta carrier detect
                2: trailing edge of ring indicator
                1: delta data set ready
                0: delta clear to send
SeeAlso: AH=07h"MultiDOS",AH=81h"COURIERS",AX=FD02h

See Also: 1400
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