On Tuesday, July 17, 2018 at 1:30 PM, Lars Brinkhoff wrote: > Mark Pizzolato wrote: > > Lars Brinkhoff wrote: > >> The ITS restoration team is getting ready to hook up eight > >> (simulated) Unibuses to a (SIMH) PDP-10. The MIT AI KA10 machine > >> really did this, and we want some of the applications that used these > >> capabilities. > > > > TMXR is the simh library which is used by terminal mux devices to > > provide telnet connections to simulated serial ports. It is also used > > by several point-to-point network devices (DMC11, DUP11) to connect > > independent simh instances via simulated WAN connections using TCP or > > UDP for data delivery. > > Sorry for the confusion, I must have misunderstood when I read about those > network devices. Though I suppose what I want could be considered a form of > point-to-point communication. > > > What devices are going to be connected to all of these Unibus(s)? > > It's mostly used to allow direct access to PDP-11 main memory.
Mostly??? What else besides memory access? Is the access from the PDP10 side done by programmed I/O (i.e. referencing addresses in the Unibus address space), or by some DMA engine which allowed transfers from the PDP10's memory to the PDP11's and back? > Maybe a longer explanation is in order. > > The MIT AI PDP-10 had a special device attached called the Rubin 10-11 > interface. It allowed connecting up to eight PDP-11s. The interface mapped > the PDP-11 memories into the PDP-10 address space. As far as I know (there's > not much in the way of documentation), there was only shared memory, no > interrupts or any other features. The PDP-10 always initiates accesses. The > 11s > could not access PDP-10 memory. Given this explanation, it would seem that you're merely looking for a shared memory model, and not really a point-to-point WAN situation. What PDP11 model(s) were involved? Was there a PDP11 memory map involved? You've got the software which ran on the PDP11's? What devices existed on the PDP11's? The UC15 simulator is a particular PDP11 simulator which has a specific model PDP11 and a limited set of devices. Given that what you've got is one way with only the PDP11's memory being accessed and no interrupts it would seem that a KA10 with a set of PDP10 Unibus(s), with each connected directly to a different PDP11 system, you could model this pretty easily. - Mark _______________________________________________ Simh mailing list [email protected] http://mailman.trailing-edge.com/mailman/listinfo/simh
