... and here's some more. This is a scan of the "PC 100 System Specification" ... and is very informative about the way the various parts of the system talk to each other (e.g. shared RAM, what CPU gets to control which pieces of hardware).

PC100 System Specifications


NCR DMV- DEC Rainbow- Siemens PCD- ITT 3030-Oly People- Acorn A5000- Olivetti M20