I also couldn't get my 810 disk drive working, so I found a copy of MULE on eBay burned on a ROM, so that was a nice find.
Great old machine, I think I'll buy one of these, the addition of HDMI and USB alone are worth it. Plus it'll be fun to write a game on that thing, something I dabbled in as a kid and was my start as a programmer so so long ago now.