The ZX Spectrum ULA: How to Design a Microcomputer - A Journey into Retro Computing

Video Generation: Detailed analysis of how the ULA creates a PAL video signal and manages the 16KB of "contended" RAM where display data is stored.

To build a modern portable "ZX-like" computer, you don't need to source a vintage ULA. Instead, you must understand its functions and replicate or re-imagine them using modern hardware.

Terms

The files on this site are available for noncommercial use only.  By downloading files, you agree to my Terms of Use.

How To Download

PDF Files Guide and Tips For Printing

Blue download buttons are available below.  Save to your device, and you are ready to print!

Download

Note: Larger files with more intricate image details may take longer to download.  

Letter Size Graph Paper (Inches) PDF
Letter Size Graph Paper (Centimeters) PDF
A4 Size Graph Paper (Inches) PDF
A4 Size Graph Paper (Centimeters) PDF
A5 Size Graph Paper (Inches) PDF
A5 Size Graph Paper (Centimeters) PDF

Love this? Add it to your pin collection!

More To Explore

The Zx Spectrum Ula How To Design A Microcomputer Zx Design Retro Computer Portable Patched May 2026

The ZX Spectrum ULA: How to Design a Microcomputer - A Journey into Retro Computing

Video Generation: Detailed analysis of how the ULA creates a PAL video signal and manages the 16KB of "contended" RAM where display data is stored. The ZX Spectrum ULA: How to Design a

  • RP2040 runs a Spectrum emulator (FUSE or custom)
  • Output to ILI9341 SPI LCD via DMA
  • Read keyboard via GPIO matrix
  • Battery management via TP4056 module

To build a modern portable "ZX-like" computer, you don't need to source a vintage ULA. Instead, you must understand its functions and replicate or re-imagine them using modern hardware. RP2040 runs a Spectrum emulator (FUSE or custom)

Scroll to Top