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

Add a simpler design variant – use a modern microcontroller to scan keys and send serial data to the main CPU, but that misses the ULA’s charm.

of the custom Ferranti Uncommitted Logic Array (ULA) chip down to the transistor level. Key Technical Focus Areas Add a simpler design variant – use a