Fixing a Poorly Commodore 64 (Part 2)
In the previous post I’d checked the DRAM and the MOS logic chips, some of which are responsible for memory decoding. The RAM was fine, and one of the logic chips had failed. I was, however, still seeing what looked like an anomalous signal on some of the address lines. I couldn’t think of an easy way to diagnose the 6510 CPU in situ, so decided to desolder it from the motherboard and test on …