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
1Carrier Detect 6Data Set Ready
2Receive Data 7Request to Send
3Transmit Data 8Clear to Send
4Data Terminal
Ready 9Ring Indicator
5Ground 10 CUT PIN
Cont’d