On 1/27/2019 11:01 PM, Fritz Mueller via cctalk wrote: > Hi Jay, > >> On Jan 27, 2019, at 7:07 PM, Jay Jaeger <cu...@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.
Will start scanning today. > > 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. > >> 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? > 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. > 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
