Zx Spectrum Test Program Link

A later utility released by Sinclair Research for the 48K and Spectrum+. It was designed to check keys not present on the original models and was often supplied via Microdrive or cassette. World of Spectrum 3. Usage & Implementation

Once the program loads (you will see a cyan screen with "ZX Spectrum Diagnostic v2.3"), follow this sequence: zx spectrum test program link

If you are looking for a more modern, open-source approach, Brendan Alford’s diagnostics are highly recommended. These are often used in conjunction with the or other external interface cartridges. A later utility released by Sinclair Research for