Point Four, Anadex, C-64 questions

I have several questions on some computers I have that I'm stuck in the mud on. Point Four Data Systems Mark 3 minicomputer: This thing dates from 1985-ish. It's rack-mountable, and I have a CDC Lark 25+25MB removable hard drive for it. The manuals I got with it are for a different model of computer. I can get into the MANIP monitor but few of the commands do anything (particularly the one to IPL off the drive- it either hangs or goes back to the MANIP prompt immediately.) I don't know if the drive or any of the cartridges contain anything at all. Does anyone know *anything* about this thing? Any info would be helpful, as I'm out of ideas. Anadex DP-6500 RapidScribe printer: I'm told it works. All of the DIP switches are set off (and there's 30+ of them). It doesn't do much at all. Does anyone have the DIP switch settings for it? I've searched the WWW and found ribbons for sale but that's it. Commodore 64: I bought a boxful of C=64 stuff today at a nifty junk market I've never noticed before. The 64 boots to one of the following screens (at random): black, blue and black stripes, blue and red stripes, red screen, red-white-blue-black stripes, white and black stripes, or multi-colored graphical garbage. Does this sound like a common failure mode, and if so, which chip? Also, what's a fair price for a Coleco Adam system: 2 keyboards, memory box with datacassette drives, external numeric keypad with knob (paddle?), and printer. One more: fair price for Apple //c+ system: CPU, monitor, two disk drives (one Apple, one other). Enough questions. Thanks for your help, Richard Schauer rws(a)ais.net