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Friendly fZ80 computer hardware

04 nov 2025

The machine is contained on a single PCB containing hardware to support a full-featured CP/M machine with every peripheral support device I could think of.

The host MCU is a Teensy 4.1, a 600 MHz ARM CPU, from PJRC emulating an NMOS Zilog Z80 chip, estimated 100 MHz usable equivalent, with a number of idealized devices (serial, floppy, parallel, etc) programmed via Z80 IO ports.

There exists USB support. At the moment only a keyboard is supported, but it works with a hub and more devices are possible.

The innards of the machine are now documented in the Operator's Manual (see the Docs page at the top.)

Kicad files for the printed-circuit and parts assembly

I have to bundle them up and make a web page. I intend to put everything here. If you bug me it may happen sooner.

All works here unless otherwise specified are copyright 2026 by Tom Jennings. Permission is granted for personal use with no remuneration. Corporations or any organization or their agents, employees, consultants or other relationships human or otherwise, expressly prohibited without written permission.