My Sharp MZ-80K[1] and BBC Micro Model B[2] are still in working order and I tinker with them from time to time. Recently I've spent a lot of time messing around with 1980s/1990s French Minitel terminals:

https://blog.jgc.org/2022/03/using-minitel-1b-as-serial-term...

https://blog.jgc.org/2022/03/voiding-warranty-on-1993-minite...

https://blog.jgc.org/2022/04/setting-up-and-running-mame-emu...

[1] https://blog.jgc.org/2011/11/back-from-dead-with-power-suppl...

[2] https://blog.jgc.org/2009/08/in-which-i-switch-on-30-year-ol...