let me sumarise what you have:
You want run Atomic on your new computer.
You installed your old mame (from around 1998) on your new compute.
you copied your roms from the old computer to the new one.
Is it correct?
If you have a very old mame (if you could give me the version it would be good) , you have to change some parameter in your config.
open you .Cfg with AtomicManager.
check the "advanced options" on the general tab
go on "advanded" tab
go on "emulator options" subtab
untick "send rom extension to the emulator"
untick " quote parameters"
tick "use only romname"
see this screenshot (sorry, it is in french here, but on the english version they are at the same location)
