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Not sure if this will help anyone but I recently made this mod to my mb6582 which worked brilliantly and is in my opinion the best option for powering the machine. I already had the switching vreg from back when altitude created the original post (thanks!). I had a couple of options for getting the 12v supply into the machine: 1. Put a c64 male power plug onto the end of a wall wart. This restricted me to a single (untested) supply that had to have the plug cut off and would create difficulties if I ever sold the machine, particularly over seas. 2. Put a barrel jack into the mb6582. Best option, but seemed too difficult given the mounting options and panel cutout is for the full size c64 jack. In the end I went with a third simple option and created an adaptor to convert any general wall wart into a usable supply. Pics included. I ended up using a wall wart from a Western Digital external drive to power the mb6582. This was an easy solution and cheap to make, and required no additional mods to the mb6582 or panel. The risk of course is someone plugging in a real c64 supply without the adaptor but no one will ever use it but me anyway. If I ever pass it on it'll come with a warning to always use the adaptor with a centre pin +ve 12v 1.5+a supply. Not sure what the effect would be if a c64 supply was plugged in directly but it may even be harmless. The adaptor only requires the +/- female barrel jack to be wired to the correct pins on the c64 male jack. Easy enough to figure out. I can't remember the exact pins off the top of my head but it'll be obvious when completing the mod. Get the plugs as close together as possible and heat shrink the lot and you're done. Cheers, Arkay. Wall wart female plug: To c64 male plug: bit of heat shrink completes the adaptor:

I thought the green once would fit better, but actually I like the blue/white ones better :-). Maybe I will change it back to the blue/white ones .... The second part of my documentation can be found here: http://www.sequencer.de/synthesizer/viewtopic.php?f=13&t=70858&start=75 Cheers orange