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

The winter of 1981 in Cambridge was damp, grey, and unforgiving. Inside the sterile, fluorescent-lit offices of Sinclair Research, the pressure was palpable. The Sinclair ZX81 had been a runaway success, but its successor—codenamed the ZX Spectrum—was behind schedule, and the clock was ticking.

: Assign strict memory addresses or I/O ports for peripheral inputs like keyboards, gamepads, and audio generators. The winter of 1981 in Cambridge was damp,

The task fell to engineer . While Clive Sinclair obsessed over the sleek case design and the price point, Altwasser had to figure out how to cram the complexity of a color computer into a single piece of silicon. He chose an Uncommitted Logic Array from Ferranti—a type of semi-custom chip that was essentially a "blank slate" of logic gates waiting to be wired together. The Design: Engineering on the Edge : Assign strict memory addresses or I/O ports