Table 67. Configuration of Jumpers

Option

CMOS

Password

Description

If pins 1 and 2 of J9F2 are jumpered (default), NVRAM contents are preserved through system reset unless the user clears them through the front panel (by pressing the Power and Reset buttons together for four seconds). If pins 2 and 3 of J9F2 are jumpered, NVRAM contents are set to manufacturing default during system reset. If the jumper is removed, NVRAM contents are preserved through system reset.

If pins 5 and 6 of J9F2 are jumpered (default), the current system password is maintained during system reset. If pins 6 and 7 are jumpered, the password is cleared on reset.

BIOS

If pins 9 and 10 of J9F2 are jumpered (default), BIOS jumps to a protected area of the flash

Recovery

part containing the "Recovery BIOS." If the normal BIOS gets corrupted, and you are unable

 

to reload a fresh copy from the floppy disk, install the jumper between pins 10 and 11 of J9F2,

 

which enables the system to boot from the Recovery BIOS. This code expects a fresh copy of

 

the normal BIOS to be located on a floppy disk present in the floppy drive.

Changing Jumper Settings

CAUTIONS

Electrostatic discharge (ESD) and ESD protection: ESD can damage disk drives, boards, and other parts. We recommend that you do all procedures in this chapter only at an ESD-protected workstation. If one is not available, provide some ESD protection by wearing an antistatic wrist strap attached to chassis ground⎯any unpainted metal surface⎯on your system when handling parts.

ESD and handling boards: Always handle boards carefully. They can be extremely sensitive to ESD. Hold boards only by their edges. After removing a board from its protective wrapper or from the system, place it component-side UP on a grounded, static-free surface. If you place the baseboard on a conductive surface, the battery leads may short out. If they do, this will result in a loss of CMOS data and will drain the battery. Use a conductive foam pad if available but NOT the board wrapper. Do not slide board over any surface.

Installing or removing jumpers: A jumper is a small, plastic-encased conductor that slips over two jumper pins. Newer jumpers have a small tab on top that you can grip with your fingertips or with a pair of fine, needle- nosed pliers. If your jumpers do not have such a tab, take care when using needle-nosed pliers to remove or install a jumper; grip the narrow sides of the jumper with the pliers, never the wide sides. Gripping the wide sides can damage the contacts inside the jumper, causing intermittent problems with the function controlled by that jumper. Take care to gently grip, but not squeeze, with the pliers or other tool you use to remove a jumper; you might bend or break the stake pins on the board.

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SKA4 Baseboard Product Guide