All systems are built from scratch and not copies of any other Z80 system.
The development process includes hardware design and software programming in Assembler.
I started reZet80 back in 2016. Off-topic note: The letter Z stands for the company Zilog and the Z80 CPU. The Z is in NO WAY related to the Russian war against Ukraine!
reZet80 projects:
reZet80 releases (including documentation, schematics and source code at GitHub):
- 2023-10: reZet80 PIONEER R1 (Haunted House-only release)
- 2022-12: reZet80 SCOUT R0 (prototype, unfinished code)
- 2022-06: reZet80 PIONEER R0
- 2021-06: reZet80 HWDK R0
- 2021-02: reZet80 DEV R1 (unfinished code)
- 2020-11: reZet80 DEV R0