Ive just been out to the shed where Ive the identical system. Your
lucky, the key has to be in the service position to open the case.
You now need to press down the lever at the back some 1/2in to release
the catch then the outside case slides back. Once youve done this you
will find that there is an inside lid which dovetails into part of the
box. When youve undone the locking screrws youll be able to get inside
this to see the innards, not that thers much you can do there..
What is more interesting in getting it working is what have you got in
the 2 expansion slots, mine only has a 16/4 ethernet card and the other
was blanked off. Does your have a video card installed?. Mine has a
hard disk, memory floppy drive etc.
I also have the descriptive book by jim Hoskins for the ibm risc 6000
what else did you get with yours? Monitor?, or terminal?
Email me as there might be something mutual in getting both mine and
yours up and running, ive no experience of these ibm's..