1) Look at very very old versions of mame... And you might get something to work.
2) Look at faster emulators. Hive is all I can think of at the moment, but there are others out there that are designed for slower machines..
but really... for 10 bucks you can get a machines 100x that speed. Not worth using at all... You will spend SO much time getting a few games to run... You would be better off asking friends if they have any crap in their basement you can mooch off.