Capcom CPS2 Programming Manual page 10

3. If needed replace the battery with a fresh spare, fit a battery holder when possible
Desuiciding
Open the following link for a video tutorial or follow the step by step guide next below.
https://www.youtube.com/watch?v=ulIi9B74HMs
Desuiciding revisions 93646B­3 and 93646B­4
1. Connect your hooking cables to the corresponding outputs of the arduino programmer
(2, 3, 11, 12 & GND)