19 May
2009
19 May
'09
11:39 p.m.
Guy Sotomayor wrote:
I typically use M9312s as the terminators (since it has boot ROMs
too). It has the appropriate jumpers. I tend to use M9302s only in
11/34s and 11/04s.
TTFN - Guy
On May 19, 2009, at 9:55 PM, Josh Dersch wrote:
Hey, alright -- checked out my boards against the drawings again, and
the EIS jumper was removed (W1 on M7233) so I reinstalled it. Now
examine/deposit increments properly -- 2 at a time, every time :).
Now to solve the termination problem and maybe then I can get a program
to run... and then... THE WORLD!
Anyone have a spare M9312?
Thanks again,
Josh
Guy Sotomayor wrote:
Yes, there are jumpers for EIS & FIS too.
Bitsavers has all of the drawings in PDF.
I usually go off of the drawings, but I've done it enough that the
drawings are the best way to make sure you haven't missed anything.
I'd have to go back and lookup the drawings and compare it against
some of the board sets I have to make sure at this point though.
Memory is the 2nd thing to go with age...I forgot what the first one
is. :-)
On May 19, 2009, at 8:25 PM, Josh Dersch wrote:
The first thing that I always do on an 11/40 is make absolutely sure
that all of the jumpers on all of the CPU boards are set properly.
DEC decided it wanted a lot of flexibility in 11/40 offerings. The
result is a lot of jumpers spread between all of the CPU boards. If
they are not *all* set properly you'll get strange behaviors.
If the boards are in an unknown condition, I would configure the CPU
to *not* use the MMU until you have the basic CPU running and
passing some basic tests before adding in the MMU back in (yea, I
know it's a pain because you have to solder/cut jumpers to change
the config).
Hmph; just got done configuring the boards for the MMU :). Is there
a good reference for how the jumpers should be configured for just
the basic CPU set? I have the engineering drawing sets (in TIFFs...
anyone have these in PDF? Tiff is annoying :)), and it indicates the
jumpers, and _some_ of them seem to indicate a "default" position,
but not all, and I don't know whether these are really defaults or
not. I know the MMU and the Stack Limit options require jumper
changes, did any other options require them?
I also don't recall at this moment the M9302, but many of the
terminator boards have jumpers for the different types of pull-ups
for some of the processor signals. If the pull-ups are incorrectly
configured for the type of processor, the unibus can hang. Remember
the unibus needs to be terminated at both ends. However, some
signals are only to be terminated at one end (ie some CPUs terminate
the signals themselves and others don't so the terminator at the end
of the bus needs to be configured properly).
The M9302 does not appear to have
jumpers, and it doesn't appear to
be of the same vintage as the 11/40 (it has a "caution" label that
mentions an 11/34 or 11/04...) so maybe it is incorrect for use in an
11/40.