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Int 14 Fn 03 - Connection Manager - Return Communication Port Status [N]
AH = 03h
DX = FFFFh
AL = connection ID
Return: AH = return code (00h-02h) (see AH=00h/DX=FFFFh)
BH = line status (see below)
BL = modem status (see AH=03h above) (only bits 4,5,7; all others zero)
Notes: if DX is 0-3 on entry, Connection Manager emulates the standard BIOS
function, but redirects the port over the network; if DX is any other
value, the call is chained
See Also: AH=00h/DX=FFFFh,AH=04h/DX=FFFFh,AH=0Ah/DX=FFFFh
Bitfields for line status:
bit 7 CTS changed
bit 6 current CTS state
bit 5 timeout
bit 4 break
bit 3 framing error
bit 2 parity error
bit 1 overrun
bit 0 current carrier state (0 active, 1 no carrier)
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