17 Mar
2016
17 Mar
'16
9:27 a.m.
On Mar 17, 2016, at 6:01 AM, Mattis Lind
<mattislind at gmail.com> wrote:
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.
TTFN - Guy
>
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.