American Megatrends MAN-772 manual Connect Onboard I/O, Pin Description Signal Description

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	9	Ring Indicator
	Ready
5	Ground	10	CUT PIN

Cont’d

Chapter 1 Hardware Installation 31