Well,
(BOMBJACK with a) P3 500MHz, 384Mb, etc. on DOS 6.22 -> TEMPEST 100%. Same stuff on win98se -> quite playable but still, DOS rules!
..On a P2 machine I'd go with the oldest version of MAME that Tempest plays 100% on ..I'd guess that TelcoLou knows it's the 0.37 version..? I've used 0.37b16 (0.37b1?) successfully on at least three different builds. That build "does" quite a few of the classics without too much processor power.
Actually, running DOS I'm sure you'd easily get it done even with a Pentium (1) level machine

My FE (in DOS): Game Launcher running MAME 0.61 ..or something.. More info on the Bombjack thread or as soon as you have questions

Have fun
