70s: Videomaster Enterprise, Atari 2600<p>80s: TRS-80 model 100, Sharp pc-1211 (both work and the latter allows weeks long computing on the one charge; eat your heart out Haswell!), MSX 1 and 2 computers (around 20 of them, all working), Amiga 500, Commodore 64 and 128, few ZX Spectrums, arcade joysticks with 1,2,3 buttons, music keyboard with a special connector which fits only a cartridge on the msx, a ton of modems for the above computers (1200/75 baud)<p>90s: around 8 Apple Newtons, Psion 5, few SGI O2s, 10 Sparcstations, E450 and a big load of laptops/desktops<p>Everything is working still (if it breaks I fix it to satisfy my electronics and soldering lust). Stuff I use regularly: MSX-2 to code on (making a game, I like the keyboard better than my laptop and it's more of a challenge to write software on paper to such a standard that the machine doesn't crash upon running it, wasting a lot of time) and creating extensions (like ethernet and making it into a 'laptop'), Atari 2600, C64 (last ninja plays nicer with an arcade joystick than the sad controls on the Android emulator) and Amiga 500 (Shadow of the beast plays nicer with an arcade etcetc).