If you've got a hard drive (preferably one with a few MB of FastRAM) and KS3.1 you don't need a 1.3 ROM or a kickstart switcher to play these games, you can use WHDload and play the games from HDD as I said.
Without some fast RAM WHDload will not work, not even a single game .slave that I know uses only chip RAM.
First commandment: grab some Fast RAM, then go HD, then updated ROM . Other things are not really necessary on an A500, like accelerators (expensive!) and other bits and bobs, except maybe a decent mouse or mouse adaptor.
