Changing System Board Jumper Settings; Processor/Bus Speed Jumpers - NEC POWERMATE PROFESSIONAL - SERVICE MANUAL 05-1997 Service Manual

B-4 System Board Settings
The following table summarizes the system board jumper settings.
Function
Processsor Frequency
Password Clear
CMOS (NVRAM and
ESCD Clear)
BIOS Setup Access
Host Bus Frequency*
BIOS Recovery
*Jumper also sets the PCI and ISA bus frequencies

Changing System Board Jumper Settings

The following subsections describe how to verify or change system board jumper settings.

Processor/Bus Speed Jumpers

The system board must be configured for the frequency of the installed processor and the
corresponding host bus, PCI bus, and ISA bus frequencies. This jumper should be set
correctly at the factory for the system.
The following procedure explains how to locate and change the processor speed jumper
setting in the unlikely event that it is not set correctly at the factory.
Table B-1 System Board Jumper Settings
Jumper
J9C1
A
B
C
D
C
D
C
A
WARNING: The system power must be off
before changing a jumper setting.
Configuration
2-3 (233 MHz) or 1-2 (266 MHz)
2-3 and 5-6 (233 MHz) or 1-2
and 4-5 (266 MHz)
2-3
1-2 Password
clear/disabled
2-3 Password
enabled (default)
5-6 Keep (default)
4 - 5 Clear
5-6 Access enabled
(default)
4-5 Access denied
2-3
5-6 Normal operation
(default)
4-5 Recover BIOS