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Technical deep dives, programming tricks, ROM lore and other long-form pieces about the ZX Spectrum and how it really works.

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Why Spectrum colours "bleed": attribute clash explained

23 August 2026

Hardware ULA Explainer

That smudgy, wrong-colour halo around old Spectrum sprites has a name, and a very simple cause: the machine can't remember a separate colour for every pixel. A tiny program below proves it, live, on screen.