Long shot, but does anyone have any documentation or software for the Imlac PDS-4? I'm working on an Imlac emulator/simulator (for the -1 and -1D) and I'd like to support the -4 as well, as it appears to add some interesting options; problem is I'm not finding a lot of detailed information about what and how it works :). (Hardware documentation/schematics would also be interesting - I have a set of what appear to be PDS-4 core memory boards and I'd love to be able to debug them since they're in rough shape...) - Josh