This year I'll be doing a retro-exhibit at the MQ in Vienna, putting the machines up and getting them running for folks to interact with and explore. The idea is to show people that, in fact - old computers never die, their users do!
The key thing is that, even if you don't have a use for that old computer - there are a hundred million other human beings out there that might, and to some of them it'll be just as useful as it was the day it was taken out of the box and turned on for the first time. Consumerism requires participation in the fallacy that 'old things have no use' - but as we can see from the resurgence in interest around the retro- scene, this is just a lie.
One of the things that has made this so interesting to me is the experience of having to set up each machine, again, with all its requisite tools. As a developer, to me this of course means having assemblers, editors, compilers, and so on - and it is quite a challenge. But once its up and running, there is no greater joy than hacking on an old machine, with no Internet and only the tools in front of me. It has been one of the coping mechanisms I use to get over the pain, suffering and misery of modern software development, where it seems every month some kid has re-invented the tools we old folks discarded years ago, and for it to become fashionable such that there is no choice, to be current, than to keep up with the rat race of compilers and libraries and editors and frameworks, oh my ..
If you've still got an old machine somewhere, do yourself a favour and get it set up again. It can really help with developer funk.