The early ethernet schematics are best read with the a copy of the
original patent (US 4,073,220) in hand. In particular, you can match up
figure 5 and the explanation in the text with the schematic from Xerox. I
wrote such a document decades ago but it has vanished along with many other
bits.
Against my better judgement, I obtained a DEC SRC Firefly dual processor
card. If i read this* correctly, then this card is interfaced to the
shared memory bus (MBUS) as opposed to the QBUS (the card uses a Q bus
format).
I realize it's probably hopeless, but I'll ask anyway: Are there any
In case you hadn't heard, the DEC archives at CHM are available and here's
the PDF:
http://archive.computerhistory.org/resources/access/text/finding-aids/102733963-DEC/102733963-DEC.pdf
Now, I wonder if it has Firefly docs...
I had forgotten about OrBit. According to this very nice document:
http://xeroxalto.computerhistory.org/Indigo/Spruce/documents/.orbitguide.press!1.pdf
... the Orbit hardware was 4 cards in the Alto II backplane. As I recall,
the SLOT interface was only 1 card; it was connected to a slower
A few notes:
The experimental Ethernet speed was in fact 2.94 MHz: It's the Alto clock
divided by 2.
The Alto based printer was called "SLOT" -- Scanning Laser Output
Terminal. It was plugged into the Alto backplane and presented itself as a
hardware peripheral controlled by microcode (as was
I was there and it was always called "The Ethernet". When the 10 Mb
standard came into being, it was then referred to as "The Experimental
Ethernet". If you want to be *really* pedantic, you could refer to it as
the "2.94 MHz Ethernet" --- but that would be silly.
If you'd like to see how Aloha
Well, as I am sure many of you know, ManualsPlus was "acquired" by the
Internet Archive.
This story captures the effort:
https://www.theatlantic.com/technology/archive/2015/09/introducing-the-archive-corps/403135/
Jim Tucker is still selling things on ebay.
When we'll see the manuals from the
For those who like that sort of thing, here's more on the author of the
PDP-8 ALGOL:
https://ouscr.org.uk/index.php/obituaries?id=54
The first implementation was done for the 7090 by McCarthy (hence CAR and
CDR --- Contents of Address Register and Contents of Decrement Register).
If you want to see a tiny implementation then look for the PDP-1
implementation done by L Peter Deutsch. There's a book chapter and then I
found
I have various TI DSP documentation but also have AT DSPs, in particular,
the DSP16. The DSP32C was much more popular however.
As a past occasional maintainer of SAIL, I'll add my version of history:
I believe the compiler originated as a class assignment for Jerry Feldman's
compiler writing class. As noted, Dan Swinehart was one of the principal
contributors. The addition of LEAP to SAIL was a direct result of
The answer to the question is Hydra I believe.
A few details for the curious:
It's housed in a BA-11 box with 3 controller cards.
The Massbus paddles fit into that box and terminate in flat ribbon cable,
not the massive cables.
The DRAM chips are 4116s.
manx tells me that these documents were known to exist:
PartTitleStatus
EK-0ML11-TD
"Asking for a friend"...
Anyone have a spare MK11 box controller? At LSSM, we're bringing up an
11/70 and we need a box controller for the new memory.
If not, we'll get by, but just in case someone has one propping a door
open...
I've been working on a newly donated PDP 11/70 at the LSSM. I just
discovered it has a ML11 --- an early Solid State Disk. Does anyone know
of any schematics, user guides, etc?
Thanks!
I realize this a rare bird indeed, but would anyone just happen to have a
Varian 620/L backplane netlist hanging around?
Unless I missed it, the schematics on bitsavers do *not* have it.
The LSSM is very interested in this machine for public display. It would
complement the museum's collection of PDP-11s and other 16 bit machines.
I heard Butler Lampson once exclaim that ECL design was in some ways easier
than TTL. If you terminated every line, you get controlled impedances with
controlled edges. This was the design philosophy for the Dorado.
No, OCR totally fails on olde line printer listing. At least the ones I've
tried (tesseract, online, ...)
On Sat, Jan 22, 2022 at 8:06 PM Ethan O'Toole wrote:
>
> Can the listings be OCR'ed?
>
> - Ethan
>
>
> > Has anyone ever used Amazon Mechanical Turk to employ
Has anyone ever used Amazon Mechanical Turk to employ typists to type in
old listings of lost code?
Asking for a friend.
Anyone have one of these haunting their Q bus board pile? The LSSM would
deadly like one.
Let me add that Howard Sturgis' dissertation "Post-mortem for a
Time-sharing System" is great reading. It's unusual that failures are
documented but this case study is worthy.
On Thu, Oct 27, 2022 at 1:00 PM wrote:
> Send cctalk mailing list submissions to
> cctalk@classiccmp.org
>
>
The LSSM is getting into the Modcomp world, so we are very interested in
the disposition of this media.
The OS tapes would be particularly valuable.
I remember circa 1977 CMU had a PDP-11 compiler for '68 with an extensive
runtime component.
I presume the sources are lost.
Peter Hibbard was the guy responsible if I recall.
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