Zx Spectrum Test Program Link Link

Lower 16K RAM, Upper 32K RAM, Keyboard, Sound, Video, and ULA features.

to verify the health of both the lower 16K and upper 32K RAM chips. Floatspy & Interrupt Tests : If you're into low-level reverse engineering, the ZX Spectrum Reverse Engineering Blog zx spectrum test program link

: Verifying the standard 256 x 192 pixel resolution and the 15-color palette (including bright and non-bright variations). Lower 16K RAM, Upper 32K RAM, Keyboard, Sound,