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

The ULA is the Spectrum's heart, but its most brilliant trick is handling video. Most computers of the era used dedicated video display controllers (like the C64’s VIC-II). The Spectrum’s ULA generates the video signal directly.

, is a must-read. It breaks down how a handful of logic gates turned a simple Z80 processor into a global icon. The ULA is the Spectrum's heart, but its

Most modern recreations (like the ZX Spectrum Next) use an FPGA (Field Programmable Gate Array) to "clone" the ULA’s logic at the hardware level. This allows for 100% accuracy and the ability to add "enhanced" ULA modes (more colors, higher resolution). The ULA is the Spectrum's heart