As far as OS3.9 goes, it should run just fine on a cd32+sx1 with 4meg fastmem. You can max it out at 8meg, but if you want more, you'll need the SX32 (upgradable to 64meg fast I think), which is sold by Eyetech and people on Ebay for ridiculous prices. There is a lot of great info at
http://cd32.amiga32.com/
