Three FAULTY ZX Spectrums and a Diagnostic Cartridge = bad ULA

Today we are looking at this #zxspectrum diagnostic board and testing it with 3 faulty #sinclair zx spectrums and a nice collection of chips marked as faulty. The Diagnostic card is based on the work of Dylan Smith and you can find more details at https://github.com/brendanalford/zx-diagnostics/wiki/Firmware You can buy from myretrostore-uk on ebay The Diagnostic board has been configured as follows: Page 0 - Dylan's diagnostic 48k ROM v0.1 Page 4 - Flash utility Page 5 - Brendon's diagnostic ROM v0.38 Page 6 - Dylan's diagnostic 48k ROM v0.1 Page 7 - Dylan's diagnostic 128k ROM v0.1 To change the default rom on the card you have to use the firmware util built into the card and that requires a working spectrum. I only covered the first steps and this is how to do the rest To change to boot ROM: Set page jumper to 2-3 Plug in cartridge Power on Spectrum Enter command: CLEAR 32767 Enter command: OUT 31,36 The flash utility will now load Press enter for other options Press x for erase