This C64 power supply goes with my Commodore 64, which I've had since the early 80s. However, using this supply, I was unable to power up the unit. I'm guessing the issue was with the C64 unit and not the power supply but I can't be 100% sure. Without a known working C64, I have no way to properly test this power adapter so please keep this in mind. Generally, power supplies like these have a long shelf life. Please follow my for more C64 and TI 99/4a items, thanks!