by Chris Smith. This is the "bible" for understanding the silicon-level logic. Open Source Projects: for VHDL code that replicates the ULA. If this is your first build, start by building a Harlequin clone
Today, we’re going to look at how the ULA defined the Spectrum’s design, why it matters for modern hardware hackers, and how understanding it helps you build your own portable retro machines. by Chris Smith
If you want, I can:
: It reads pixel and attribute data from "lower RAM" to generate a PAL signal (256x192 resolution). If this is your first build, start by
The ZX Spectrum ULA: How to Design a Microcomputer by Chris Smith is widely considered the definitive technical resource for understanding the "heart" of the Sinclair ZX Spectrum. Through painstaking reverse-engineering down to the transistor level, Smith reveals how a single custom chip—the Ferranti Uncommitted Logic Array (ULA)—managed almost all of the computer's operations, from video generation to keyboard scanning. from video generation to keyboard scanning.