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SERIAL - GET PORT STATUS

AH = 03h
AL = 00h (ArtiCom)
DX = port number (00h-03h) (04h-43h for Digiboard XAPCM232.SYS)

Return:
AH = line status (see #00304)
AL = modem status (see #00305)
AX = 9E00h if disconnected (ArtiCom)

Note: The 1993/04/08 Compaq system ROM uses only the low two bits of DX

See Also: AH=00h - AH=07h"MultiDOS" - AX=8000h"ARTICOM" -

Bitfields for serial line status:

Bit(s)  Description     (Table 00304)
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

Note: For COMM-DRV, if bit 7 is set, an error occurred, and may be retrieved through a separate call (see AX=8000h"COMM-DRV")

Bitfields for modem status:

Bit(s)  Description     (Table 00305)
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

Category: Serial I/O - Int 14h - S

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