I don't need 12v anymore.
I like it! :D
How's it wired up internally?
http://www.cpcwiki.eu/index.php/Reset_Button
I soldered to where pin 40 comes through to the top of the main board a few mm behind the top contacts.
Pin 40 is on the underside. I also used the big soldered ground point between the expansion contacts and the 12v cable entry.
I could take a photo if you want
Photos please
Added wiring photo to original post