It is a fairly big deal for a lot of us, just in this room I'm sitting in I've got 3 vintage machines from the late 70s to early 80s, and 3 generations of Windows machines (95, 98, XP), alongside my work and personal computers. There are vintage computer fairs the world around, there are vintage computer clubs (ours here in the general Indy area meets monthly) the world around, there are numerous podcasts and some sizable YouTube content creators too.

There is even a healthy level of developing new software and hardware for vintage computers and consoles.

https://atariage.com/ is a quick look at (mostly, but not exclusively) Atari related for example. Then you have

YouTube creators like:

- LGR https://www.youtube.com/channel/UCLx053rWZxCiYWsBETgdKrQ

- Gaming Historian https://www.youtube.com/channel/UCnbvPS_rXp4PC21PG2k1UVg

- Modern Vintage Gamer https://www.youtube.com/c/ModernVintageGamer

- Adrian's Digital Basement https://www.youtube.com/channel/UCE5dIscvDxrb7CD5uiJJOiw

- 8Bit Guy https://www.youtube.com/channel/UC8uT9cgJorJPWu7ITLGo9Ww

- Nostalgia Nerd https://www.youtube.com/channel/UC7qPftDWPw9XuExpSgfkmJQ

- This Does Not Compute https://www.youtube.com/channel/UCEp20NgOZHmgWdbQdHSxgjw

- Noel's Retro Lab https://www.youtube.com/channel/UC2-SP1bYi3ueKlVU7I75wFw

- RMC - The Cave https://www.youtube.com/user/RetroManCave

- My Life in Gaming https://www.youtube.com/c/mylifeingaming

etc. A lot of the above channels have videos restoring vintage hardware, or doing dream builds with vintage hardware.

Podcasts like:

- ANTIC The Atari 8-bit Podcast https://ataripodcast.libsyn.com/

- Floppy Days Vintage Computing Podcast https://floppydays.libsyn.com/

- Amigos Retro Gaming Network https://player.fm/series/amigos-retro-gaming-network-amigos-...

- Retro Computing Roundtable http://rcrpodcast.com/

- Sprite Castle https://podcast.robohara.com/category/spritecastle/

- RetroMacCast https://retromaccast.libsyn.com/

etc

Hardware and software developers/stores like:

- https://retroradionics.co.uk/ (bought a brand spankin' new Joystick for my Atari machines from them in December, it's very nice)

- https://atariage.com/store/ (you say you want to play Halo on your 2600?)

- https://lotharek.pl/

- https://www.atarimax.com/

- https://newstuffforoldstuff.com/index.py

etc

There is also a very healthy vintage computer preservation community on the Internet Archive - preserving magazines, zines, newsletters, manuals, schematics, software, etc.

- https://archive.org/details/vintagesoftware

- https://archive.org/details/atari_2600_library

- https://archive.org/details/softwarelibrary_c64

- https://archive.org/details/commodore_c64_manuals

etc.