Fixing a poorly ZX-Spectrum (Part 2)
Finally got around to powering up the motherboard this morning and have done a preliminary check of the board. First problem was to find a good ground connection for connecting the crocodile clip of my probes too. Thankfully the Spectrum has a common ground and it turns out the heatsink is grounded, so that problem was solved fairly quickly. I thought I’d start off with a simple test. Is the Z80 receiving a 3.5Mhz clock …