The Zx Spectrum Ula How To Design A Microcomputer Zx Design Retro Computer Portable [verified] -

To avoid hardware conflicts, the ULA has priority access to "contended memory" (the first 16 KB of RAM). It can physically stop the Z80's clock to take control of the bus. I/O Management: It handles Port , which manages the border color, beeper sound, and the keyboard matrix. Universidad de Valladolid How to Design Your Own Microcomputer

Whether building a desktop replica or a portable "Speccy," there are three main hardware paths: Discrete Logic (The "Harlequin" Method): Projects like the Harlequin board available on replace the unobtainable ULA with standard TTL logic chips To avoid hardware conflicts, the ULA has priority

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The ZX Spectrum’s minimalist design—just a few RAM chips, a Z80 CPU, a ROM, and the ULA—was revolutionary. The ULA reduced component count drastically but created a bottleneck for modern replicas: it is obsolete, undocumented at the transistor level, and impossible to source. To build a portable Spectrum (handheld, LCD screen, battery-powered, SD card storage), one must first solve the ULA problem. To build a portable Spectrum (handheld, LCD screen,

On Core 1: Drive the SPI LCD at 60fps from the framebuffer.