Appendix C
Functional Description
C-5
FIGURE C-4
Riser Board Layout Diagram, Side 2
C.4
Jumper Descriptions
There are two jumpers that can be configured, the CPU speed jumper J3, and the
PROM jumper J2. See “OpenBoot PROM Jumpers
page C-14, or Section 8.5.2, “Replacing the Motherboard” on page 8-14.
Jumper configurations can be changed by setting jumper switches on the
motherboard. The motherboard jumpers are preset at the factory. For more
information on CPU jumper settings, see Section 8.1.2, “Replacing the CPU” on
page 8-3.
A jumper switch is
closed
(sometimes referred to as
shorted
) with the plastic cap
inserted over two pins of the jumper. A jumper is
open
with the plastic cap inserted
over one or no pin(s) of the jumper.
TABLE C-2
Riser Board Connectors, Side 2
Connector
Description
J501
Power supply connector
J502
IDE drive power connector
J503
Secondary IDE channel connector
J504
Primary IDE channel connector
J502
J501
J504
J503
IDE 1
IDE 2
J505
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