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ENPL

Building Retro Computers

Resurrect the Z80 and 6502 era by designing and building your own 8-bit computer from scratch

intellectualcraftyphysical$$ mediuma weekenddifficulty 4/5

Step back to 1980 and build a functional computer using discrete chips and minimal components. Projects range from simple Z80-based boards to complete 6502 systems with display and keyboard. You'll learn digital logic, microprocessor architecture, memory management, and assembly language. The magic moment arrives when you type a command and see output—a computer you built with your hands.

How to start

  1. 1
    Choose a simple design (Grant Searle's Z80 is legendary for beginners)
  2. 2
    Source vintage or modern chips (eBay, Digi-Key, specialty suppliers)
  3. 3
    Build the power supply and clock circuit first
  4. 4
    Wire the CPU, ROM, RAM, and I/O modules on breadboard
  5. 5
    Write bootloader code and load it into EEPROM
  6. 6
    Test and debug until you get a prompt

What you'll need

  • Z80 or 6502 CPU
    Essential
    ~$5
  • RAM & ROM Chips
    Essential
    ~$10
  • Large Breadboard
    Essential
    ~$20
  • Power Supply & Regulators
    Essential
    ~$30
  • EEPROM Programmer
    Essential
    ~$20
  • Oscilloscope (for debugging)
    Nice to have
    ~$150

Where to learn more

Plot twists

Ways to spice this up when the basics get boring.

  • Add graphics capabilities with discrete logic
  • Build a Forth interpreter for your CPU
  • Create a minimal operating system
  • Build a retro game console variant
  • Design a Z80 calculator with matrix keyboard
ADHD notes

Debugging is tedious but extremely satisfying when it works. Break into stages: power supply → basic clock → CPU running → ROM → RAM → I/O. Celebrate each stage.

Fun fact

The Z80 processor from 1976 is still manufactured and used today—you can run code on hardware almost 50 years old.

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