DEC M9312 Configs for a 11/40

Josh Dersch derschjo at
Sat Nov 26 13:09:46 CST 2016

I can take some pictures of the M9312 I have running in my 11/40 tonight if
need be.  The manual at
(page A-2) suggests that W8 should be IN.

Can you describe how your system is configured (i.e. what's on the bus,
what's in the CPU, etc?).

Have you double-checked that the interrupt vectors for your SLUs are
correctly configured?  The console (and BASIC, IIRC) does not use
interrupts for serial I/O and will work if the vector is misconfigured (I
discovered this the hard way in my 11/05) but other things will not and
will behave badly.

I'd also suggest using PDP11GUI to load in diagnostics directly, this
avoids needing to be able to boot XXDP...

- Josh

On Sat, Nov 26, 2016 at 9:58 AM, william degnan <billdegnan at>

> >
> >
> > 2) Yes or no - Should W8 be in for am 11 40/25/10/05 or is the /40
> > special?
> >
> >
> >
> TYPO - I mean "11 40/35/10/05" or is the /40 special?
> b

More information about the cctech mailing list