I like that JK mentioned the topic of emulators.
If you want to relive memories of the past, you can emulate just about any older computer on a new one, or emulate older game consoles or arcade games on them as well. We've known since Turing it's possible to emulate hardware through software, and you can do it....
It's interesting how much programming energy goes into peoples' sense of nostalgia, but there is a warm fuzzy feeling to seeing the original Lode Runner from the 1980s boot up on your new shiny 2012 PC.... and it will run a lot smoother. (In fact, some of these games have to be artificially slowed down or they would run too fast on a new machine, even in emulation.)
Here's a site devoted to various Windows (and some Mac and Linux) emulation software.http://www.emulator-zone.com/
It's even possible to emulate current
gaming consoles, but of course, if you're getting ROM files of existing current games, you're almost certainly violating IP. And, of course, when you're emulating current as opposed to older hardware, there tends to be a speed slowdown.
BTW, this site used to have emulators for the old Atari 2600, 5200, consoles or 800 computer, etc., but they had to take them down not because the emulators were illegal but the Atari company is still around and said they couldn't use their name.
I had a Sega Genesis console back in the 90s, and it was fun to run the Genesis emulator on my Mac to replay some of those games, recently. The trick with any of these emulators is getting the ROM files for games, whose legal status is .... debatable.