I think it only applies to the 7 or so games that had chd's. For them, you don't need the xor's or the 4gb chd's. They just run by using an internal algorithm.
An accessory for MAME32 and derivatives. It shows some interesting information for each game. For MAME, version 1.11b has been released, and PINMAME version 1.54 is available. >> Get them HERE.
On this computer I have 512mb ram and 500mb swap file, but it's used for internet stuff only, no games. The other computer has 4gb of ram and therefore no swap file is needed. When you get your 2gb of ram you could get rid of your swap file, imo.