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[mr jones]

Most of Capcom's CPS-2 games are just are too large to play on Mame when they're uncompressed.  You're best bet is to use Final Burn Alpha for the CPS-2 games.  Besides having a small button configuration problem, its an excellent emulator for CPS-1 and CPS-2.

As for the Donkey Kong problem, Donkey Kong hasn't ever been quite successfully emulated.  To compensate for this, the coders used samples to simulate the proper sound effects.  The sounds are pretty authentic, so you don't notice it when playing.  You can get the samples at mame.dk.  Put them in the "samples" folder in mame-x.  Make sure that you enable samples in your mame.ini file, otherwise you still won't be able to hear them.

Hope this helps,
mr jones