Technical information

A/4 LS PRO OWNER'S HANDBOOK
Inside the System Unit
Appendix A
Jumper PL6 - Clearing CMOS memory
This jumper affects the CMOS memory and the security system.
In the “Normal” position, with pins 1 and 2 connected, the
contents of CMOS memory, including the current security
configuration, are maintained by the configuration battery.
In the “Clear CMOS” position, with pins 2 and 3 connected,
CMOS memory is not maintained and its contents are lost after
only a few seconds. The jumper can then be returned to the
“Normal” position.
You may need to erase the security configuration if the Master
user cannot logon. Before doing this, make sure you know the
computer’s unique System Identification Number (SIN). The
SIN provides an fail-safe mechanism in case the jumper is
removed maliciously in an attempt to by-pass security. The SIN
is normally printed on a label stuck onto the motherboard, but
this label may have been removed as a security precaution. If
the SIN label is missing, ask the person responsible for
administering the security system for help.
When the computer is next turned on, several error messages
will appear because of the missing configuration information.
Once these have been acknowledged, the following dialog
appears, requesting the SIN:
Security Checksum Failure
OK
Enter SIN