C64 to C128 PSU Adapter Cable Ribbon cable The C128-Plus/4 power adapter is

The C128-Plus/4 power adapter is made of high quality connectors and cables

It's a lot lighter and more compact than the original Amiga power supplies

but you may be able to use less

so if you feel for it

C64 to C128 PSU Adapter Cable Ribbon cable The C128-Plus/4 power adapter isPower adapter converting Commodore 64 DIN7 round plug to Commodore 128 DIN5 square plug. Conveys +5V DC and 9V AC. Matches C64 pinout on one side, and C128 pinout on the second side. For using an ordinary Commodore 64 power supply with a Commodore 128 system. Features Converts Commodore C64 pinout to Commodore C128 Conveys 9V AC and +5V DC Round DIN7 plug (female) and square DIN5 plug (male) For use exclusively with Commodore 64 and 128 High quality