Dell OptiPlex 210L Guide De Référence Rapide page 22

Jumper Settings
Mini Tower Computer
Jumper
PSWD
1 2 3
RTCRST
3 2 1
jumpered
22
Quick Reference Guide
PSWD
Setting Description
Password features are enabled (default).
Password features are disabled.
The real-time clock has not been reset.
The real-time clock is being reset
(jumpered temporarily).
unjumpered
RTCRST