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

To save precious system memory, color data is stored separately from pixel data at a lower resolution. The screen is broken down into a matrix of (each 8x8 pixels wide). Each block is allocated exactly 1 byte of attribute data in RAM, governing: INK: The foreground color (3 bits) PAPER: The background color (3 bits) BRIGHT: Enhanced luminance toggle (1 bit) FLASH: Alternating ink/paper animation toggle (1 bit)

In an era of Raspberry Pi 5s running at 2.4GHz with 8GB of RAM, why learn how to design a machine with 16KB and a glue logic chip? To save precious system memory, color data is

At its core, the "Uncommitted Logic Array" is best described as a [8†L11-L17]. In the late 1970s, designing a fully-custom "Application-Specific Integrated Circuit" (ASIC) from scratch was hideously expensive, requiring millions of pounds in tooling and development. At its core, the "Uncommitted Logic Array" is

, a precursor to modern FPGAs. It was a "blank slate" of logic gates that could be custom-wired at the factory to replace nearly all the support circuitry of a microcomputer in one single chip. Core Functions: The ULA’s Busy Schedule It was a "blank slate" of logic gates