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Int 14 Fn 03 - Serial - Get Port Status [S]
AH = 03h
AL = 00h (ArtiCom)
DX = port number (00h-03h) (04h-43h for Digiboard XAPCM232.SYS)
Return: AH = line status (see below)
AL = modem status (see below)
AX = 9E00h if disconnected (ArtiCom)
Note: the 04/08/93 Compaq system ROM uses only the low two bits of DX
See Also: AH=00h,AH=07h"MultiDOS",AX=8000h"ARTICOM",AH=81h"COURIERS",AX=FD02h
Bitfields for line status:
bit 7 timeout
bit 6 transmit shift register empty
bit 5 transmit holding register empty
bit 4 break detected
bit 3 framing error
bit 2 parity error
bit 1 overrun error
bit 0 receive data ready
Bitfields for modem status:
bit 7 carrier detect
bit 6 ring indicator
bit 5 data set ready
bit 4 clear to send
bit 3 delta carrier detect
bit 2 trailing edge of ring indicator
bit 1 delta data set ready
bit 0 delta clear to send
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