> > > Studying the MS11 Maint Manual, the MS11 controller has access to the full > address and data from both the CPU (FastBus) and UNIBUS B. (The FastBus > actually has two uni-directional data busses; in and out.) So all that > info, > this hypothetical cache board can get from the slot it is plugged into > (assuming the cache is plugged into one of the controller slots), over its > connector pins. > > The connectors on the back of the card, and two small boards, must be for > listening to UNIBUS A (in configurations in which the two UNIBI aren't > joined > together)? (I'm too lazy to check the slot numbers are see what they > actually > are.) > > And there is indeed a signal which the MS11 uses to tell the CPU it has the > location the CPU is asking for, so it's theoretically possible to build a > cache > card that plugs into a FastBus slot. >
Here is how it is connected: https://i.imgur.com/4TEZoiO.jpg The sandwiched dual boards are i sitting in 27 / 26 AB. The board in 27AB was empty (quick glance), while the board in 26AB has a few TTL chips on it. Slot 26AB is the Unibus A slot, Slot 27 AB should be a terminator on Unibus B. (maybe there were terminating resistors on the second board. Didn't check in detail) Slot 28AB is Unibus B and goes to the DD11-C and the RK11-D backplanes. The hex ABLE/ ACT board sits in slot 21 which is the memory controller board for the MS11. It very much looks like it is a Cache board. But why have some one written "Not used" (Används ej) on it? I'll hope I find the documentation for it! /Mattis > > Noel > >