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Chapter 1 Hardware Installation
29
Step 6 Attach Cables, Continued
When connecting chassis connectors to the motherboard, make sure to
connect the correct connector end. Most connector wires are color-coded.
Match the color of the wires leaving the switch or LED to the same pin on the
connector end. There may be more than one connector with the same color-
coded wires. If so, follow the wire to the switch or LED. Pin 1 is always
indicated on the motherboard.
CPU Fan A three-pin berg labeled FAN attaches to the CPU fan. The FAN connector is
near the CPU end of the ISA expansion slots.
Pin Description
1 Ground
2 +12V
3 Ground
Chassis Fan A three-pin berg labeled EXT_FAN attaches to the chassis cooling fan. The
EXT_FAN connector is near the CPU.
Pin Description
1 Ground
2 +12V
3 Ground
IR Infrared The 8-pin infrared connector (IR) next to the COM1 and COM2 connectors
attaches to an infrared port mounted on the computer chassis. It allows data
transmission to any other device that supports the IrDA standards for infrared
transmission.
Remote Control Power RPW_COM is a 3-pin berg next to the USB connectors that attaches
to the power supply for enabling system power when the remote power switch
is turned on. Connect a 3-wire power cable to RPW_COM and attach the
other end to the peripheral device.
USB Connectors The Apollo IV motherboard has two 4-pin headers (USB1 and USB2) that
attach to a USB connector on the computer chassis. The USB port allows you
to attach to a USB hub. The USB connector pinouts are the same for both
USB connectors:
Pin Signal Description
1 VCC (Fused 5V)
2 - Data
3 + Data
4 Ground
Cont’d