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L Break Into Program

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Tag Archives: RAM

Fixing a Poorly Commodore 64 (Part 1)

L Break Into Program

Following on from the previous post where I’d removed the SID and desoldered the PLA, and with a Commodore 64 that was still exhibiting a fault, I moved onto the next stage of the diagnostics, removing and testing the DRAM. This was a fairly straightforward task, and mostly covered in the video. At the end, it appeared that I was still having issues with the address lines on the CPU, so the next stage was …

Fixing a poorly ZX-Spectrum (Part 9)

L Break Into Program

I was rather hoping that my long-winded series on fixing a 48K Spectrum had concluded with Part 8, but it turns out this Spectrum had one more surprise in store for me. Last month, I borrowed its keyboard whilst testing a new ROM image in my Harlequin. I tested it afterwards and it decided to fail with garbage on screen. This is symptomatic of lower RAM failure, so I quickly unplugged it, got my multimeter …

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Recent Posts

  • Composite Video on the Raspberry Pi Pico
  • Fixing a Poorly Commodore 64 (Part 3)
  • Fixing a Poorly Commodore 64 (Part 2)
  • Fixing a Poorly Commodore 64 (Part 1)
  • Fixing a Poorly Commodore 64 (Intro)
  • Electronic Dice project for Beginners
  • Homebrew Z80 Computer (Part 6)
  • Homebrew Z80 Computer (Part 5)
  • Homebrew Z80 Computer (Part 4)
  • The Spectrum Next

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