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T e c h n i c a l I n f o r m a t i o n
Flash Memory S8C1-3
This switch enables or disables writing to the motherboard Flash
memory. To set this switch:
1.
With the side panel removed and the electronics chamber
uncovered, set this switch to ON to apply +12V power to the VPP
pin on the flash memory device. This allows the user to enter the
BIOS and modify selections with the SCU.
2.
Set it to OFF to prevent the user from updating the contents of (i.e.
write-protect) flash memory.
Configuration Jumpers
The jumper is a small plastic-encased conductor (shorting plug) that slips
over two jumper pins. To change a jumper setting, use a pair of needle-
nose pliers or your fingers to remove it from its current location. Position
the jumper over the two pins for the desired setting, and press it onto
them. Be careful not to bend the pins. The following table summarizes
the jumper options. The illustration on page 5/15 indicates the enable
and disable settings for these jumpers.
Jumper
J6A1, Video Sleep
J7C1, Program Boot
Block
J7D2, Boot Block
J9B1 FD1 (Floppy
Driver 1)
J9C1 FD0 (Floppy
Driver 0)
J9C3, PWR CTRL
* Factory default setting.
5-16 OWNER'S HANDBOOK
Pins
Description
1−2 (REG 46E8)
Selects address register at
46E8H
Selects address register at
*2−3 (REG 3C3)
03C3H
*1−2 (Disable)
Prevents writing to the BIOS
boot block
Enables writing to the BIOS
2−3 (Enable)
boot block
Normal BIOS boot block
*1−2 (Disable)
Recovery BIOS boot block
2−3 (Enable)
*1−2 (1.44 MB)
Disables 2.88 MB size
detection
2−3 (2.88 MB)
Enables automatic size
detection
*1−2 (1.44 MB)
Disables 2.88 MB size
detection
2−3 (2.88 MB)
Enables automatic size
detection
*1−2 (Enable)
Disables RTC power control
2−3 (Disable)
Enables power supply
maintenance voltage control
using the RTC
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