29 Jan
2019
29 Jan
'19
11:08 a.m.
On 1/27/2019 11:01 PM, Fritz Mueller via cctalk wrote:
Hi Jay,
Will start scanning today.
On Jan 27, 2019, at 7:07 PM, Jay Jaeger <cube1
at charter.net> wrote:
I think I can help some... I DO have earlier PDP-11/45 CPU drawings...
Man, this list is the absolute best!
The '72 KB11-A drawings would be most immediately useful. If you only have time for
a subset of pages, I would find the schematics for M8100, M8103, M8105, and M8106
particularly interesting.
It would also be interesting to compare the M8103 ROM listings between the '72 and
'74 drawing sets and see whether they snuck in any microcode changes/fixes.
I do have KT11-C and FP11-B in my system, but haven't checked their provenance yet.
To the extent that I've had to repair these, anyway, they've matched the drawings
that I do have.
My 11/45 has not been on for a lonnnng time. Some time ago I had it on,
it could sometimes boot RT-11, but failed MUL diagnostics - but I was
not confident that the diagnostic itself was correct.
I will see if I can check on the +15V issue (hopefully without having to
turn the thing on) - I don't have a real TTY for it to talk to, so it
isn't something I would have noticed.
I have a PDP-11/45 From U. Wisc. ECE that claims
to be S/N 1525
Wow, another <2000 11/45! Do you have yours up and running? Do have its ECO history?
I found one other oddity during my restore that seems related to early 11/45's -- no
+15V to pin CU1 in SPC slots 26-28, which keeps any EIA DL11 from working correctly in
those slots (though the contemporary 20ma DL11-A would work). I have a feeling this might
have been addressed in a later ECO. It would be interesting to check this on your
backplane?
Thanks for taking a look through your library, and for
the generous offer to take the time to do some scans.
cheers,
--FritzM.
Not a problem. Fortunately, when I migrated to my new PC this winter, I
had the foresight to test my scanner - which did NOT work because the
TWAIN drivers for it (a Ricoh IS300e) would no longer install, and
installed a virtualbox VM running Windows 7 to talk with it.
JRJ