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Step 8 Connect Onboard I/O,
Checking for Conflicts
AMIBIOS automatically checks the adapter cards installed in the expansion slots on the motherboard for a hard disk or
floppy controller and serial or parallel ports and minimizes conflicts between onboard and offboard I/O.
P14 Serial Port 1 (COM1) and P10 Serial Port 2 (COM2)
P14 and P10 are 10-pin dual-inline bergs that connect via 10-pin double-row ribbons to male 9-pin D-sub connectors
fastened to the chassis to provide an ISA serial port interface. The connector pinout is shown below. Pin 1 on the bergs
is labeled "1". The wire leading to pin 1 on the cable usually has a colored stripe.
Excalibur PCI Pentium ISA Motherboard User's Guide
Continued
If AMIBIOS...
finds an IDE hard disk drive
controller on an adapter card in an
expansion slot,
finds a floppy drive controller on an
adapter card in an expansion slot,
finds serial ports on an adapter card
in an expansion slot,
finds a parallel port on an adapter
card in an expansion slot,
Pin
Use
1
Carrier Detect
2
Receive Data
3
Transmit Data
4
Data Terminal Ready
5
GND
then...
the onboard IDE controller is
automatically disabled.
the onboard floppy controller
is automatically disabled.
the onboard serial ports are
automatically disabled.
the onboard parallel port
uses an alternative address
Pin
Use
6
Data Set Ready
7
Request to Send
8
Clear to Send
9
Ring Indicator
10
Key (N/C)
47
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