If you are looking to test a Spectrum (16k, 48k, Plus, or 128k), these are the standard programs used by the community.

When creating software for the ZX Spectrum today, the "test program" can range from a simple diagnostic tool to check your hardware to a sophisticated unit testing suite for new Z80 code. Recommended ZX Spectrum Diagnostic & Test Tools

If you are looking for programs to test hardware functionality (RAM, ROM, keyboard, ULA), these are the primary links:

Zx Spectrum Test Program Link Best • Certified & Certified

If you are looking to test a Spectrum (16k, 48k, Plus, or 128k), these are the standard programs used by the community.

If you are looking for programs to test hardware functionality (RAM, ROM, keyboard, ULA), these are the primary links: If you are looking to test a Spectrum