The Zx Spectrum Ula How To Design A Microcomputer Zx Design Retro Computer Portable !!better!!

In the early 80s, building a microcomputer usually required a "glue logic" board filled with standard chips to manage memory and video. Sinclair contracted to create a custom ULA—a semi-custom chip where the logic gates were pre-fabricated, but the final metal layer was "committed" to Sinclair’s specific design. This reduced the part count, lowered costs, and made the Spectrum’s small form factor possible. Key Functions