DOSBox + Abuse = Hours of fun that can run on most computers. I mean, even my laptop can run it at full speed, and it can barely run L4D at absolute minimum settings. Might also want to look for other fun games in there. ;)
Also, with DOSBox, i also recommend the original Quake. While the full version costs, the shareware version doesn't, and it's still plenty fun. Quake isn't found at Abandonia, but you can find the demo at http://www.xtcabandonware.com/ and probably some other places too.