Zx Spectrum Test Program Link Here

It tests RAM, ROM, and ULA without needing a working CPU to load tape software. Where to find it: Retroleum Diagnostics Site 2. Tape-Based Test Programs

Depending on whether your Spectrum can still boot to the copyright screen or is completely "dead," you will need different types of test software. The Brendan Alford Diagnostic ROM (Open Source) zx spectrum test program link

To create and test your own code as a "test program," these tools convert modern text files into Spectrum-compatible formats: It tests RAM, ROM, and ULA without needing

Disclaimer: Repairing vintage electronics requires soldering skills. Always power down the unit before attempting repairs. If you'd like, I can: It tests RAM

Some Spectrums are picky. Use (Windows/Linux) or Audacity (Mac/PC) to convert the TAP to a WAV file. Set parameters: