Main Fediverse accounts:
Avatar is a bunny with floppy rabbit ears, and spare rabbit ears. It is holding a floppy disk featuring Lemmings, and there is a screen of ZX Spectrum Lemmings in the background.
Kbin does odd things with links and communities, so I think part of the problem is it has mangled or added some unexpected links when you’ve written the post. However, some of your links in the original post work for me on Lemmy (!freegames@feddit.uk is fine), so you might want to compare them.
I’m not sure why Lemmy uses an exclamation mark for communities when everywhere else uses an @. It would be a lot easier if it used @ then it’s universal for Kbin, Mastodon, Lemmy.
The new communities group suggests to use the format I’ve used in my previous posts (basically /c/community@instance) - this won’t work on Kbin because it uses /m/. It’s better to use @ there as you said.
OK, so will probably miss loads, but try these for starters. Where I’ve found multiple for the same platform the more active ones are nearer the top.
!amiga@kbin.social (Kbin)
!commodore64@kbin.social (Kbin)
!zxspectrum@kbin.social (Kbin)
!atari@lemmy.sdf.org (Atari 8-bits, can’t find one for the ST)
As for platforms, there are a load of retro ones which can be added, not sure if you want to include those?
Not a name, but something else to be aware of which could also happen with names.
There’s an open source equivalent at https://codidact.com/
On Connect, the latter works but the former doesn’t. Weirdly if I click on my own username posted upthread, it can’t find me.