How to fix an 8-bit computer with only cheap tools

Picked one by one from a mixed channel. Transcript check: both title readers certain; 3 of 5 sampled certain picks confirmed by transcript, none failed. Channel rule: Include only repair, troubleshooting, restoration, build and technical-exploration videos of vintage computers and electronics with descriptive, non-clickbait titles (e.g. 'Commodore 1702 repair', 'PET Rescue Part 3: Replacing bad RAM', 'Building a Commodore 64 Diagnostic Test Harness'). Exclude product reviews, clone and gadget evaluations, mail calls and hauls, early phone and gadget tests, and hook-style titles.