Emulators
I have been in the computer industry for 40+ years and as a result I've used a lot of different computers in my time. Computers from the 70's 80's 90's obviously then onto PC's at the crossover point. As a result I sometimes like to tinker with these old machines but frankly most are now so old that he physical hardware is hard to keep working and so I use emulators instead. You may find some of these interesting, I will link to relevant resources if I know about them.