The Spectrum’s genius is its low chip count:
The book provides a deep dive into the reverse-engineered design of the Ferranti ULA, stripping it down to transistor-level schematics to explain how it integrated various computer functions into a single cost-effective chip. The Spectrum’s genius is its low chip count:
Both the CPU and ULA need the RAM. The ULA wins, "pausing" the CPU to draw the screen. The Spectrum’s genius is its low chip count: