PDP-11/05-NC with M9301?

william degnan billdegnan at gmail.com
Thu Mar 17 09:24:22 CDT 2016

> 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.

Once I tried putting a M9312 into the backplane of my 11/05 NC.  The M9312
did not boot to the console monitor, but there should be a way to do it, I
just did not find it.   I have an expanded backplane.  If you look at the
M9312 or M9301 you can surmise that these are not going to do anything like
what the M930 does


The M9301 is a ROM card, just like the M9312, one is an older model and
they're compatible roughly I believe.  I recall from the manual that one
could use the M9301 in an 11/05, but was not able pursue if it works yet
for my set up.  I will eventually check this, but if there is a test you'd
like me to try send and I will fire up the system.  I have the manual, I'd
want to read up on it first to be sure I am installing correctly.  Not sure
what ROM is installed on the card I have.
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