The Zx Spectrum Ula- How To Design A Microcomputer -zx Design Retro Computer- [top] (2025)

in 2010, the book is the result of Smith's years-long effort to reverse-engineer the Ferranti Uncommitted Logic Array (ULA) down to the transistor level. Core Technical Focus

" by is a seminal work for retrocomputing enthusiasts, offering a comprehensive, transistor-level deconstruction of the Sinclair ZX Spectrum's custom heart. Published in 2010 by ZX Design and Media , it serves as both a historical record and a practical technical manual for designing 8-bit hardware. The Role of the ULA (Uncommitted Logic Array) in 2010, the book is the result of

In the annals of computing history, few machines evoke as much nostalgia and technical fascination as the . Released in 1982 by Sinclair Research , it wasn’t just a computer; it was a masterclass in minimalist engineering. At the heart of this "rubber-keyed" wonder sat a single, mysterious chip: the Uncommitted Logic Array , or ULA . The Role of the ULA (Uncommitted Logic Array)

It was elegant, but it meant designing a custom chip from scratch. Altwasser sent his specifications to Ferranti, the semiconductor manufacturer. The blueprints detailed the logic gates, the timing sequences, and the video generation. They were creating the brain of a microcomputer on a slice of silicon no larger than a fingernail. It was elegant, but it meant designing a