I have fixed quite a few broken Commodore 64’s, but this one was by far the most challeging one! The machine started out as a simple memory fault that was fixed so it could run the cartridge game of Jupiter Lander. However, it took a heap of replacement chips before I finally cracked it! In the process, I found that Jupiter Lander seems to be able can run without working memory chips, Character ROM and Kernal ROM… I ended up using a brute force chip replacement approach by swapping everything even remotely connected to a black startup screen. A total of 9 chips, a power switch, an RF box and two capacitors were replaced before the machine was up and running again. It may have been cheaper to just buy a whole new board, but where is the fun in that 🙂
Read the struggle of the repair job here (link).
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