You can get a HD to work on an A500. Two ways I know of are:
1. Get an Alfapower HD interface. This sits on the expansion port on the left of the machine and provides two IDE connectors and you can put up to 8Mb of ram in it also.
2. Get a Viper 520 accelerator board. Provides a faster CPU (68020) and a couple of 2.5" IDE connectors and I think it also has a Kickstart ROM onboard.
I have both and they work well. I have a CD Rom connected to the Alfapower as well as a "huge" 200Mb drive.
But I have no idea where you might get these items now.
