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

+-----------------------------------------------------------------------+ | PORTABLE RETRO SYSTEM ARCHITECTURE | | | | +--------------------+ Control +--------------------+ | | | Physical Z80 |==================>| FPGA / CPLD | | | | (or CPU Core) | | (ULA Replicating | | | +--------------------+ | Video, I/O, Audio)| | | ^ +----------+---------+ | | | Address / Data Buses | | | v v Screen Data | | +--------------------+ +----------v---------+ | | | SRAM / ROM | | Microcontroller | | | | (Modern Memory) | | / Scan Doubler | | | +--------------------+ +----------+---------+ | | | | | v HDMI / SPI | | +----------v---------+ | | | Portable LCD | | | +--------------------+ | +-----------------------------------------------------------------------+ Step 1: Choose Your Core Architecture You must decide how to implement the CPU and the ULA:

Projects like the rebuilt ULA show it is possible to achieve 100% timing accuracy without original parts. 4. Designing a Portable Retro Computer

The ultimate DIY "ZX Design" isn't just about preserving the original desktop computer—it is about shrinking it down to fit in your pocket. Use an FPGA to output clean or digital HDMI/DVI signals

Use an FPGA to output clean or digital HDMI/DVI signals.

What (VGA, HDMI, or composite) do you want to use? This link or copies made by others cannot be deleted

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A TP4056 or similar battery management chip to handle safe USB charging. including any personal information you added.

The ULA was the "glue logic" that made the Z80 CPU work with the rest of the system. Its core jobs were:

can run emulators that mimic the Z80 and ULA, driving a small LCD screen for a handheld device.

Do you need help writing the for the video timing matrix? Share public link