Sony PCV-L640 - Manuel (Page 81)

System Board 67
Configuration Jumper and Switches
There is one configuration jumper (CMOS), and a bank of six
configuration switches (1-6) that sets the CPU speed multiplier, AGP
interrupt state (AGP_INT), and on-board VGA state (VGA).
CMOS Jumper
A jumper cap is installed on pins 1 and 2 (Normal) of the CMOS jumper
when the computer is shipped. Do not move the jumper cap to the
CMOS Clear position unless directed by a Sony-authorized technical
support person.
O N
1 2 3 4 5 6
KY0059.VSD
1 2 3
CMOS Clear Normal