It features an incredibly clean, automated RAM tester that loops indefinitely to catch intermittent thermal faults (chips that only fail after they warm up). ZX Spectrum Factory Test Tape (The 1983 Original)
This is a simple utility designed specifically to test every key on the keyboard matrix. The on-screen display shows a visual representation of the keyboard, and a key press is typically registered when a red square appears over the corresponding key on screen. zx spectrum test program link
Do you have any available, like a DivMMC, a diagnostic cartridge, or an EPROM programmer? It features an incredibly clean, automated RAM tester
Method 1: The External ROM Cartridge Link (For Dead Machines) Do you have any available, like a DivMMC,
For completely dead boards, you will need a physical cartridge.
This is the gold standard for Spectrum diagnostics. It is often what people mean when they ask for a "test program."
: A highly accurate and free emulator available for multiple platforms [9, 29].