let's count my computers (i am including currently non-functional ones marked with *)

1. 2017 main desktop
2. 2006 desktop later used as server*
3. 2009 laptop used as server*
4. 2013 laptop used as server
5. 2014 main laptop
6. 2007 thinkpad
7. 1996 toshiba satellite
8. 1992 amiga 600
9. 1985 hotbit msx
10-12. 3 old android phones
13. main android phone
14. android tablet
15. pocketchip

dubious computerness:
16. ipod touch 3*
17-18. wii and dreamcast (both could run OS)
19. psp?

i am proably forgetting something

(continuing dubious-computerness list)
20. old windows mobile HTC
21. palm z22