> > > There are jumpers on this card. W1, W2, W. I did not find any > specific > > examples online of scenarios for the jumpers > > ... > > I think I get why one would remove the W2 jumper but if W1 is removed > > (open) instead can someone give me an example scenario for when you'd > > want to use this card "for beginning of non processor bus > termination". > > Can someone give me an example of when you'd do this? > > The device the M9300 was invented for was probably the RH11-AB, which is > where one most often finds them. The RH11 is an UNIBUS device which is a > MASSBUS controller; the RH11-AB has connectors for _two_ UNIBI (so one > RH11-AB can be 'in' two PDP-11's at the same time; i.e. all the devices > connected to that controller can be accessed from either machine). > > If it's only connected to a single CPU, though, what does one do with the > second UNIBUS? That's where the M9300 comes in. It simulated the > NPG-granting > section of a CPU, and when jumpered to do that, it goes at the _start_ of a > UNIBUS - e.g. the second UNIBUS in the RH11-AB. (Leave all the jumpers in, > and it functions like an M930, and can go at either end). > > You can find a description of its use in the RH11-AB, as well as a > description of how the M9300 works, in the "RH11-AB Option Description" > document (available online), starting on page 4-32. > > I can't conceive of any use for one in most PDP-11's, though (outside an > RH11-AB, of course). > > Noel >
OK. Yes, the system I have was set up for RH-11. Here is the layout starting from slot 9/11 of the expansion cabinet of the 11/40 I am working on 9/11: M9202 (1-2) 11: M7297 (3-4) 11: 7296 (5-6) 12: M7295 13: M7294 14: M5904 (3-4) 15: M5904 (3-4) 16: M5904 (3-4) 17: GC (4) 18: GC (4) 18: M9300 (1-2) 19/21: M9202 (1-2) 19: GC (4) 21: M7248 (3) M7212 (4) M7212(5)M7212 (6) 22: M784 (5) M783 (6) 23: M7213 (3-4) M785 (5) M785 (6) 24: EXPANSION CABLE (1-2) 24: "small card" (4), M785 (5) M785(6) 26: M9700 (3), M105 (4), M7226 (5-6) 27: M7821 (4) 28: M117 (4) 29: M002 (4) 31: CABLE FROM 24 31: M7258 (3-6) 32: M8094 33: M8098 34: M7800 YA (3-6) 31: - 32: - 33: - -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>