You can find the latest version (v1.73 as of late 2025) and full PDF documentation at Retroleum.co.uk . 2. Brendan Alford’s ZX Diagnostics
For the best results, Diagnostic ROMs are often paired with hardware devices such as the or a custom-built interface, which can override the standard ROM and bypass corrupted system areas. They are essential for diagnosing catastrophic failures like a dead system or a completely scrambled display. zx spectrum test program link
: For developers, this Z80 assembler for the ZX Spectrum includes built-in unit testing capabilities. You can build and run tests directly on a 48K, 128K, or Next machine using the unitzx.tap Brendan Alford's ZX Spectrum Diagnostics You can find the latest version (v1
