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This article provides a curated list of the best diagnostic tools, explains how to use them, and offers direct access to essential diagnostic software. What is a ZX Spectrum Diagnostic ROM?
If you have a modern SD card interface attached to your Spectrum: zx spectrum test program link
The ZX Spectrum test program link was a simple, menu-driven program that guided users through a series of tests. These tests covered various aspects of the computer's hardware, including:
Note: This article assumes a basic familiarity with the ZX Spectrum platform, its memory map, and its tape/disk loading model. Where necessary, concise technical detail is provided to make the procedures actionable.
If your machine loads, you can use software to test the keyboard, colors, and sound. Do you have an available
Verify the health of the ROM chip and the Z80 processor.
Because the screen RAM may be dead, the test program outputs status via the border color (port 0xFE ). A typical sequence:
ZX Spectrum Test Program – Diagnostics & Hardware Check This article provides a curated list of the
Unique to the Spectrum, the ULA steals CPU cycles during screen drawing. A subtle bug in a faulty ULA can cause seemingly random crashes only when the screen is being updated. The test program runs a shadow test : writes a pattern to RAM, then repeatedly reads it back during both active display and border periods. If the reads fail only during active display, the ULA’s contention logic or the DRAM’s access time is marginal.
Test programs for the Spectrum are usually loaded in one of two ways: Sinclair ZX Spectrum Test ROM