The test program will fill memory addresses with specific patterns (like #AA and #55 ) and read them back.
If you are struggling with a specific issue, like a "black screen of death," let me know: you are working on (48K, +2positive 2 +3positive 3
The world’s largest archive of Sinclair software. Under the "Utilities" section of the archive, searching for terms like "Test", "Diagnostic", or "Supertest" will reveal dozens of original 1980s tape images ( .tap and .tzx ). zx spectrum test program link
If you are working with the later 128K models or looking for the "Official" experience, fruitcake.plus.com is an essential resource.
Insert the diagnostic ROM chip into the device and plug it into the rear edge connector. The test program will fill memory addresses with
The custom Sinclair chip responsible for video, sound, and tape I/O. If this dies, the system often displays a dead black or white screen.
System crashes only when trying to load 48K games; test software reports bank errors. Replace the failing 4532 or 4164 chip. Keyboard Matrix Pressed keys do not register on the visual grid. Replace the brittle keyboard membrane. 4 ULA Border Test If you are working with the later 128K
Requires a working keyboard and working lower RAM to load the software. Establishing a Test Program Link: How to Load Diagnostics
If you are looking to test a Spectrum (16k, 48k, Plus, or 128k), these are the standard programs used by the community.
In this article, we will provide the best places to download these tools, explain how to use them, and list the best test program links. What is the ZX Spectrum Test Program?