PDP-11/05 microcode dump?
steven at malikoff.com
steven at malikoff.com
Sat May 7 19:40:56 CDT 2016
> BTW, when you say that the microcode listings in your 1973 print set are
> "Revision B", are you referring to the "Microprogram Flow", "Microprogram
> Symbolic Listing", or "Microprogram Binary Listing", because they can be at
> different revision levels (given in the box in the extreme lower right
That's a good question, my conclusion about being the same was from a cursory
glance only, going on the first few page and making a mistaken assumption the
rest were the same. Now you mention it, I've spent a little bit more time looking
at the print set and I now understand the revision differences as detailed.
Mine is Rev B. Pages 6,7,9,10,12,13 are still 27-JUL-72, 5-SEP-72 27-JUL-72,
27-JUL-72, 27-JUL-72,27-JUL-72 respectively. Not sure why they used a DD-MMM-YY date
format when the rest of the dates are US format, probably for improved legibility.
But, I can see these are noted on the update grid on the first page, anyway, I added
the dates for a bit of extra info.
Microprogram Symbolic Listing-
Mine is Rev D. Pages dated 27-JUL-72, 5-SEP-72, 22-AUG-73, 22--AUG-73, 27-JUL-72.
Microprogram Binary Listing-
Mine is Rev D. Pages 27-JUL-72, 5-SEP-72, 18-OCT-72, 22-AUG-73, 22-AUG-73, 27-JUL-72.
Microprogram Cross Reference Listing-
Same lineprinter listing as the pdf, but the odd thing here is that mine has the
listing pages numbered properly yet the later pdf listing has them struck out and
> ....so I'd be fairly surprised if the microcode was
> actually identical. I think you'd have to look at every bit to be sure; the
> data on which chips changed
You are right. I made the assumption thet were identical from the first four or
so pages being the same lineprinter listing, just re-copied, but did not expect
to find the pdf having later dated pages inserted into the listing - who would
do that these days (or even back the?) that they would not just run off a whole
new listing. I appreciate your detailed comment as I've learned something I didn't
know yesterday! Probably no point scanning mine in as it's superseded by the
later listings in the pdf. Mine is more legible however.
Sometime I'll get my 11/05's running, still working on converting modern rack
slides into serviceable ones to fit the H960s. It's coming along but quite slowly,
it's a suprising amount of work. Until then my gear is likely to stay piled up on
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