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It handled keyboard scanning, tape input/output, and the internal "beeper" sound. The Zx Spectrum Ula How To Design A Microcomputer Pdf 57l
If you want to follow the "How to Design a Microcomputer" methodology from that PDF today, here is the workflow the original Sinclair engineers used: : A ground-up look at how 8-bit computers
The ZX Spectrum ULA: How to Design a Microcomputer by is a highly regarded technical guide that details the reverse-engineering of the Sinclair ZX Spectrum's custom gate-array chip. The Zx Spectrum Ula How To Design A Microcomputer Pdf 57l