The , specifically the version published by Sinclair Research Ltd in 1985, is a legacy utility designed for internal diagnostics and Input/Output (I/O) handling on the 48K ZX Spectrum. Overview & Utility
Found on various retro archives, this utility offers an extensive set of checks, including specific tests for the cassette interface and sound functionality.
Exploring the world of ZX Spectrum test programs is a journey into the heart of these beloved 8-bit machines. From the simple keyboard test to the powerful diagnostic ROM, each tool offers a unique window into the computer's soul. Whether you're a repair veteran or a hobbyist just starting out, having the right test program links at your fingertips empowers you to diagnose, restore, and preserve the legacy of the ZX Spectrum for generations to come.
Once you have successfully linked and loaded your diagnostic software, follow this triage workflow to interpret the results: Test Component Visual Indicator / Error Common Fix Lower RAM (16K) zx spectrum test program link
Developed by Alan C. Watson in 1991, is another powerful diagnostic utility. Like the official program, it runs tests on the RAM, keyboard, printer, and joystick , as well as performing ROM checksums. One of its convenient features is the ability to save and load tests, providing a flexible suite for maintaining your Spectrum's operational health.
Remove the original ROM IC and insert the diagnostic EPROM.
| Type | How it loads | Best for | | :--- | :--- | :--- | | | Burned into an EPROM (e.g., 27C256) and replaces the original ROM. | Dead machines that won’t even boot to a border. | | Tape File (.TAP/.TZX) | Loaded via a phone/PC into the Spectrum’s EAR port. | Machines with a working border and basic boot. | | Snapshot (.SNA/.Z80) | Loaded via a DivMMC or SD card interface. | Machines with a working RAM top and an interface. | The , specifically the version published by Sinclair
Fast RAM testing that identifies the exact physical chip location on the motherboard (e.g., IC6 to IC13). Where to Download: ZX Spectrum Test Program Links
Automated RAM testing (even if all RAM is dead), ULA timing tests, keyboard testers, and AY-3-8912 sound chip tests.
. These are flashed onto external cartridges or ROM replacement boards and are essential when a Spectrum won't boot into BASIC. Brendan Alford’s ZX Diagnostics: From the simple keyboard test to the powerful
What do you have (e.g., Issue 2, Issue 3B, Issue 6A)?
Download the .tap version of your chosen test program and copy it directly to the card.