Joe; I recently sold one of these on eBay, not for much. The Roadrunner is a multi event controller for multiple slide projectors. The monitor plugs into the video connector and is just a composite monitor for the computer. I think the 5" monitor power plug fits into a matching socket on the expansion box so that is the one I would use. the disk drive plugs into the back of the expansion cab. Plugged together something should come up on the screen. IIRC the Record Out and Play In are for the control signal pulses generated by the controller. Also Out 2 on the expansion unit. The patch panel looks like it is for audio. The most interesting for me would be the S100 Eagle. AVL did use S100 computer systems. The 9" monitor and the keyboard go to the Eagle box, as does one of the disk drives I think. The Roadrunner I sold was just the small controller keyboard. And it was missing a keycap; I got about $28 IIRC. The Eagle is late 1970s or early 80s and the Roadrunner is early 1980s. Video projectors have taken over most of the market for this for multiple slide projector shows. You seem to have complete sets of equipment so it is probably worth getting the Eagle and saving both. Paxton Astoria, OR