The is a utility originally developed by Sinclair Research Ltd. in 1985 to diagnose hardware and input/output (I/O) functionality. It is a critical tool for retro-computing enthusiasts to verify the health of original hardware components like RAM, keyboard response, and sound. Core Diagnostic Software
A is the most valuable bookmark you can have if you own more than one Speccy. The link provided in this article ( github.com/retrobreww/zx-diag ) has been tested on Issue 2, Issue 3B, and +2 Grey models as of December 2025. zx spectrum test program link
If you want to write a custom piece of code to test specific features (like memory or graphics), you have two main routes: The is a utility originally developed by Sinclair
To effectively maintain or repair a , having the right test software is essential. Whether you are dealing with a "dead" unit that won't boot or a system with intermittent memory errors, different tools serve different diagnostic purposes. 1. Official Sinclair Test Programs Core Diagnostic Software A is the most valuable
: For those comfortable with soldering, you can buy pre-programmed EPROM chips like the Logan RAM Test ROM Go to product viewer dialog for this item. to permanently replace a faulty internal ROM. Common Tests Performed
Tape (TAP/TZX)