0

CALCULON/80: Z-80 Microprocessor-based Homebrew Microcomputer

This is a gorgeous project by Jack Engqvist Johansson with some good documentation including additional shots, schematics, and decision-making thoughts over on his website.

Memory: 64 KiB read-write RAM, 4 KiB ROM
CPU: Z80A (4 MHz)
Peripherals:

  • 1x RS-232 (DTE, DB9S, Flow Control: RTS/CTS)
  • 1x UART
  • 2x 16-bit timers
  • IDE Host Interface (16-bit read, 8-bit write, no interrupts or DMA)
  • 2x 8-bit GPIO output ports
  • 2x 8-bit GPIO input ports
  • Here are pictures of the breadboard prototype and un-populated PCBs:

    This website documents the building of a computer based on the Z-80 microprocessor. The intentions of this was to have fun and learn. The project starts simple with only some ICs in a test circuit and ends with a complete computer, with ROM, RAM, I/O and storage. A minimum requirement was that it should be capable of running CP/M and being accessible through a serial interface (RS-232).

    I have not yet ported any operating system to the computer, but when I do, I will post it here. Same goes with the technical documentation and other interesting things.

    Read more.


    Join 7,000+ makers on Adafruit’s Discord channels and be part of the community! http://adafru.it/discord

    CircuitPython in 2018 – Python on Microcontrollers is here!

    Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.

    Join us every Wednesday night at 8pm ET for Ask an Engineer!

    Follow Adafruit on Instagram for top secret new products, behinds the scenes and more https://www.instagram.com/adafruit/


    Maker Business — The many, many manufacturing processes listed on Wikipedia

    Wearables — A bevel illusion

    Electronics — Blown transistor?

    Biohacking — We are Wired to Exercise at a Moderate Pace

    Python for Microcontrollers — Make It Move with Crickit!

    Get the only spam-free daily newsletter about wearables, running a "maker business", electronic tips and more! Subscribe at AdafruitDaily.com !



    1 Comment

    1. I probably still have diskettes that have version of C/PM on them that this thing could run… 🙂

    Sorry, the comment form is closed at this time.