TRS-80 Model III Questions

A while back I picked up a TRS-80 Model 3 without disk drives. It works fine and I've been on the prowl for drives for it. Well, the other day while picking up some PDP-8 stuff (questions for another time), the guy gave me 2 Model 3s with drives. I've cleaned them up and checked them out and finally powered them on. Now this is the problem. They come on and the lower drive (drive 0?) lights up and then stops and the screen stays blank. I don't have a DOS for them so my question is, should these boot up without it as my cassette based 3 does, giving me the Cassette? and RAM? questions or do I have to get TRSDOS or one of the others. If these systems are bad, I'm thinking of moving the drives to my cassette system. Looks like a lot of boards to move, assuming the drives and controller are ok. Comments? Also, can someone help out with a copy of TRSDOS, NewDOS, LDOS or some other and a comm program? Thanks. ----- David Williams - Computer Packrat dlw(a)neosoft.com http://www.neosoft.com/~dlw