Computer Hardware User Manual
108 SKA4 Baseboard Product Guide
Table 67. Configuration of Jumpers
Option Description
CMOS 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.
Password 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
Recovery
If pins 9 and 10 of J9F2 are jumpered (default), BIOS jumps to a protected area of the flash
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 groundany unpainted metal surfaceon 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.