Jupiter Lander running with failed RAM chips. breadbox64.com

Brute Force Repair!

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).

© breadbox64.com 2017

3 comments on “Brute Force Repair!

  1. Thanks for the nice story and I’m happy that you succeeded in repairing your C64! I hope some day I will do it too (black screen of course) 🙂

  2. This repair has been the most difficult one I’ve done so far. In hindsight, I could have done things differently and saved a few chips. However, sometimes more knowledge is gained from the journey and not the destination. I guess fixing C64’s sometimes has a steep learning curve – at least for me it has 😉

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