hey guys, i've been tossing around the idea of a bartop for a while.  i have a few 17" LCD monitors sitting around collecting dust.  i ran across an old laptop the other day that has a shattered screen.  it wasn't worth putting any money into to replace the screen, but i figured it may be suitable for running mame.
it is a pentium 3, 800mhz, with 128mb of ram.  yeah, i know that sucks.  i may have some more ram lying around that could go into it, i'm not sure.  I'm currently running mame 124, which i have a feeling is way too new for this old of a PC.  the laptop currently has no OS installed..i figured with those specs, win98 is probably my best option.  any opinions? I know i could run dos mame, which would boot really fast, however it has been a long time since i did anything with dos, and i don't know if i could get the audio working.  
i'm not looking to run mk3 or anything like that...mainly classic vertical games with a single 4way stick and 1 or 2 buttons....mainly Donkey Kong, Pacman, etc.  There are so many versions of mame out there, i'm just not sure which one to use.   also, i understand that roms for one version of mame wont always work with another.  is there a way to convert the .124 roms that i have to run in a much older version?  i look to only around 20 to 25 games, so it shouldnt be that bad if i have to manually do each one.
any suggestions?
is it worth even doing this?  i have enough pieces lying around to put together a much better PC, but i figured if the laptop was enough, it would take up much less space internally.