Some Z80 links so I don’t forget them

RC2014 is a simple 8 bit Z80 based modular computer inspired by the home built computers of the late 70s and computer revolution of the early 80s. It nominally has 8K ROM, 32K RAM, runs at 7.3728MHz and communicates over serial at 115,200 baud.

Grant’s 7-chip Z80 computer

Fusix: A Unix-a-like OS for 8bit and other older micros

Easy Z80 An easy to build Zilog Z80 based single board computer