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 CPU Speed Selection” on
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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