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Replace the flexible plastic keyboard membrane inside the case.
Load the program using a standard ZX Spectrum interface (like an SD-card based DivMMC). Alternative Way to Play (No Test Needed)
If the test cannot complete, it may display an error pointing to a faulty Z80 or faulty ROM chip. Summary of Diagnostic Tools Needed
Several diagnostic tools have been developed over the years, ranging from official Sinclair factory software to modern, community-developed ROM images. zx spectrum test program link
Because copyright and hosting locations shift over time, the global retro-computing community relies on a few centralized repositories to download these diagnostic tools safely.
If your Spectrum shows no signs of life (black screen), you need a . As the computer's own ROM is likely at fault or the RAM is preventing a boot, a proper diagnostic ROM will bypass these issues. For the best chance of success, boot directly into the diagnostics without relying on system RAM, for example, by using the "Bank B Override Mode" on a Retroleum SMART Card.
Do you have an available?
For the modern enthusiast, running that test program for the first time on a “dead” Spectrum and seeing the border turn white, then green, then cyan is a moment of pure alchemy: base metal into gold, noise into signal, silence into the promise of a working machine.
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To properly use these test programs, you should have the following on hand: Replace the flexible plastic keyboard membrane inside the
: A highly regarded tool for the original 16K/48K and later 128K models. It tests RAM, ROM, keyboard, sound, video, and various ULA/Z80 features. Manual & Details Retroleum Diagnostic ROM Documentation Sinclair Test ROM (1983)
A diagnostic test program bypasses or directly interrogates the system hardware to pinpoint exact component failures. Instead of guessing which of the eight RAM chips is faulty, a test program will tell you precisely which bit (and therefore which chip) is corrupt. Test programs can diagnose: ULA (Uncommitted Logic Array) malfunctions ROM corruption Keyboard matrix interruptions and dead keys Sound (Beeper and AY-3-8912 chip) issues Peripheral and joystick port connectivity Top ZX Spectrum Diagnostic Programs
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Summary of Diagnostic Tools Needed Several diagnostic tools