> On Mar 17, 2016, at 9:35 AM, Mattis Lind <mattisl...@gmail.com> wrote: > > 2016-03-17 17:27 GMT+01:00 Guy Sotomayor <g...@shiresoft.com>: > >> >>> On Mar 17, 2016, at 6:01 AM, Mattis Lind <mattisl...@gmail.com> wrote: >>> >>>>> >>> >>> If one read notes in the PDP-11/04 printset it says: Do not insert a M930 >>> or M9302 in a MUD slot. Only in the Unibus slots or you will have short >>> circuit. On the other hand it does not say that the M9301 (or M9312) >> cannot >>> be installed in a unibus slot. It recommends that those boards go into >> MUD >>> slots. But electrically I cannot see that it shouldn't work. Especially >> if >>> you jumper W1 - W5. >>> >> >> Hopefully this will clarify a few things: >> “Unibus”: These are the AB connectors in the *last* position of a >> backplane. >> It allows for bridging between backplanes. The only “card” that can go >> these >> “slots” is a terminator (ie M930) or a terminator bootstrap (ie M9312). >> >> SPC: These are the CDEF connectors in any of the slots of a “unibus” >> backplane. >> Not all backplanes support SPC slots. >> >> MUD: These are the AB connectors in some newer backplanes (usually >> associated with >> the extra slots in a CPU backplane…11/34 and 11/04 CPUs have MUD slots). >> MUD >> stands for “Modified Unibus Device”. They are *not* compatible with >> Unibus slots >> as they have different voltages present than what are on the Unibus >> slots. You *will* >> “blow out” a board by plugging something designed for a Unibus slot into a >> MUD >> slot. >> >> > Yes. That is pretty clear from pin assignment list that bad things WILL > happen if you try to install a Unibus-slot-compatible device into a MUD > slut. But the vice-versa? Installing a MUD-compatible device into a > Unibus-slot?
Most of those are memory boards and from my recollection they just won’t work. TTFN - Guy
