General Question about UNIBUS backplanes
billdegnan at gmail.com
Tue May 24 08:37:16 CDT 2016
> But the M9312 has bus terminating resistors (unless you actually desoldered
> those!). Then you have three terminators in your system! One in the M891 at
> the CPU, one in the M9312 in slot 3 of last DD11, and then a M930 in slot 4
> of DD11.
> If you want the M9312 you should put it with W1-W5 installed in the slot 4
> where you have the M930. You should not have both a M930 and M9312 (when
> you have the M891).
After I sent the email to this group, I checked the M9312 and found it was
terminated. I was told it was not, I should have checked for myself but I
grew suspicious that it should be by default. Now, the M9312 is in the
last slot, and I removed the M930. There is nothing except a grant card in
the 3rd slot.
I fixed the core problem I described in my email. I also am able to store
into core and run "chase the lights", I have generally speaking a working
Next - Get a serial card running and resume efforts to boot RT11 from an
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