The Zx Spectrum Ula How To Design A Microcomputer Zx Design Retro | Computer Portable Work

For the modern builder, understanding the ULA's video signal integrity is crucial. When building a portable unit, bypassing the native RF modulator and tapping directly into the ULA’s composite video output is the first step to a clear picture on a modern LCD.

Because both the CPU and ULA needed access to the same RAM, the ULA managed "contention" by stopping the Z80’s clock when the video circuitry needed priority access. System Timing: For the modern builder, understanding the ULA's video