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Chapter 1 Hardware Installation
31
Step 7 Connect Onboard I/O
Onboard I/O The Apollo IV 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 IV 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 AMIBIOS Setup. The
serial connector pinout is shown below. COM2 and IR use the same IRQ, so
the COM2 connector does not work if an infrared device is attached to the IR
connector.
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