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

The ZX Spectrum ULA was designed by Ferranti, a renowned British electronics company, in collaboration with Sinclair Research Ltd. The ULA was fabricated using a 5 μm CMOS process, which was quite advanced for its time. The chip contains approximately 15,000 transistors and operates at a clock frequency of 3.5 MHz.