The Zx Spectrum Ula How To Design A Microcomputer Zx Design Retro Computer Portable Official

The Sinclair ZX Spectrum is an icon of 1980s home computing. At the heart of its compact, affordable design was a single custom chip — the ULA (Uncommitted Logic Array) — which turned the Spectrum from a pile of discrete logic into a low-cost, mass-producible microcomputer. This article explains what the ULA did, why it mattered, and how you can use the same principles to design a retro-style portable ZX-like microcomputer today.

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: Emulate the entire Spectrum in software, using PIO (Programmable I/O) for pixel output. The Sinclair ZX Spectrum is an icon of 1980s home computing