Digital Equipment Prioris XL 6000 Series, Service Maintenance Manual

Page: 147 / 174

Technical Specifications
A-6
Main Logic Board Jumper Settings
The following table lists the main logic board jumper and factory-default settings. Figure
A-1 shows the jumper locations.
CAUTION:
Do not touch any electronic component unless you
are safely grounded. Wear a grounded wrist strap or touch an
exposed metal part of the server chassis. A static discharge from
your fingers can result in permanent damage to electronic
components.
Feature Function Setting Description
CMOS clear
Protect
(1)
J36A, pins 1 and 2
(1)
Preserves the contents of NVRAM.
Erase J36A, pins 2 and 3 Replaces the contents of NVRAM with the
manufacturing default settings.
Password
clear
Protect
(1)
J36B, pins 1 and 2
(1)
Maintains the current server password.
Erase J36B, pins 2 and 3 Clears the password.
Flash
program
Protect
(1)
J36C, pins 1 and 2
(1)
Prevents writing to the BIOS boot block.
Erase/Program J36C, pins 2 and 3 Permits boot block erasing and programming.
Intrusion
detection
disable
Enable
(1)
J37D, pins 1 and 2
(1)
Activates intrusion alarm switch on the chassis.
The switch then detects and signals when the
chassis side panel is removed.
Disable J37D, pins 2 and 3 Deactivates the intrusion alarm switch.
Recovery
boot
Normal boot
(1)
J37E, pins 1 and 2
(1) Enables the server to boot from the normal
BIOS.
Recovery boot J37E, pins 2 and 3 Enables the server to boot from the recovery
BIOS if the normal BIOS gets corrupted and
you are unable to reload a fresh copy of the
BIOS from diskette.
Processor
core clock 166 MHz
180 MHz
200 MHz
J37F, pins 1 and 2
J37F, pins 2 and 3
J37G, pins 1 and 2
(1)
Selects the processor core frequency, which in
turn determines the operating frequencies of
processor and PCI busses.
(1) Factory default setting