17 Mar
2016
17 Mar
'16
9:35 a.m.
2016-03-17 17:27 GMT+01:00 Guy Sotomayor <ggs at shiresoft.com>:
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?
On Mar 17, 2016, at 6:01 AM, Mattis Lind
<mattislind at gmail.com> wrote:
cannot
>
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) 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.
TTFN - Guy
/Mattis