http://www.z80.info/ http://www.z80.info/ has a lot of information, but it's not a forum as such. I've found a couple of groups on reddit, for retro building a

http://www.z80.info/ http://www.z80.info/ has a lot of information, but it's not a forum as such. I've found a couple of groups on reddit, for retro building and z80 systems, but nothing really large. FWIW this is the high-level overview I've put together: https://steve.fi/Hardware/Z80/ https://steve.fi/Hardware/Z80/