Chapter 2. System-Board Features
Switch 8 controls writing to the diskette drive.
Clear CMOS Request Jumper
This jumper, on the system board, is used for clearing CMOS in the event that it becomes corrupted or
needs to be refreshed for any reason. For the location of the Clear CMOS Request jumper, refer to
“System Board, Type 6893” on page 16.
Riser Card
The riser card in your computer has two ISA slots and three PCI slots. The third PCI connector from the
top shares a slot with the ISA connector directly
below it. The other slots are dedicated to either the ISA
or PCI bus. You can install only one adapter in the shared slot, for a total of four slots.
The following illustration shows the expansion slots and connectors on the riser card.
Diskette Drive
Connector
Primary IDE
Connector
(Back)
Secondary IDE
Connector
System Front
Panel Connector
PCI
PCI
PCI
ISA
ISA
Wake on LAN
Asset ID Connector
SCSI Hard Drive LED
Modem
Wakeup
340-Pin
Connector
CD
Audio
Shared
Power
(Back)
Fan Connector
Alert on LAN
The riser card plugs into the system board via a 340-pin connector and expansion adapters plug into the
ISA- or PCI-expansion connectors (slots) on the riser card. Each ISA-expansion connector provides a
16-bit-wide data path, and each PCI-expansion connector provides a 32-bit-wide data path.
Shared slots will accommodate either an ISA adapter installed in the ISA connector, or a PCI adapter
installed into the PCI connector. Shared slots cannot accommodate ISA and PCI adapters at the same
time.
Note: The front fan is thermally controlled by the System Management Controller. The front fan for most
configurations will be on for a short period of time, then will be turned off when the temperature of the
system is controlled.
Figure 9. Diskette Drive Device Access (Switch 8)
Write enabled (factory default)
Off
Write protected
On
Figure 10. Clear CMOS Request Jumper (J9)
Pins
Description
1 and 2
Normal (Factory default)
2 and 3
Clear CMOS/Password
18
Technical Information Manual
