>... >BTW I've since learned that the FD-500 requires a 12V supply and hence >requires a multi-pak on the Coco 3. > - The FD-500 does not require a 12V supply. It uses a WD1773 FDC which is 5 volt only. The original Radio Shack controller (Cat No 26-3022) is the only one which uses the WD1793 and thus requires 12V.