Apollo III PCI Pentium ISA Motherboard User’s Guide
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Step 6 Onboard I/O
Onboard I/O
The Apollo III motherboard has:
•
two serial ports (COM1 and COM2),
•
a parallel port (LPT),
•
an IDE controller on the PCI bus. The primary IDE connector is IDE1.
The secondary connector is IDE2.
•
a floppy controller (FDD).
The serial and parallel port connectors are described below.
Conflicts
AMIBIOS minimizes conflicts between onboard and offboard I/O devices.
AMIBIOS automatically checks the adapter cards installed in the expansion
slots on the Apollo III motherboard for a hard disk or floppy controller and
serial or parallel ports.
Serial Ports
COM1 and COM2 are 10-pin connectors that provide an AT-compatible
serial port interface. Connect the cables supplied with the motherboard to the
10-pin serial connectors. The serial port base I/O port address and other serial
port settings can be selected in Peripheral Setup in WINBIOS Setup. The
serial connector pinout is shown below.
Pin
Description
Pin
Signal Description
1
Carrier Detect
6
Data Set Ready
2
Receive Data
7
Request to Send
3
Transmit Data
8
Clear to Send
4
Data Terminal
Ready
9
Ring Indicator
5
Ground
10
CUT PIN
Cont’d