CA 'Naked Mini'

Does anyone on this list know anything about a machine I've just rescued? It claims to be a 'Computer Automation' Naked Mini, and mine appears (alas) to be incomplete I have the 4U rack case, the backplane, frontpanel (which seems to use membrane switches and LEDs), CPU board (At least I assume that's what it is - it's got some 74x181 ALU chips on it) and 2 core memory boards. The PSU is missing, but even so I think it was worth saving. I guess I can hack something together. I have no docs on this at all, so any info would be welcome. I don't fancy working it all out my own. Talking of docs, does anyone have a copy of the I/O reference manual (or whatever the title is) for the HP9100 calculator? This manual was written for people who wanted to interface non-HP peripherals to the HP9100 (HP's first ever calculator), and contains hardware info on the connector on the back of that machine - info that's not in the operation/programming manual. I'd be interested in any info on that I/O port - I want to try a few things. -- -tony ard12(a)eng.cam.ac.uk The gates in my computer are AND,OR and NOT, not Bill