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 …