>> least.. but yeah.. might be impossible to ever really know. I'm just
>> wondering why the price jumped to $40+ each all of a sudden!
> a very large number of schlock IC sellers all communicate with each
> other. They all have a continuous stream of wants or needs that they
> exchange. but they make their own prices. The probability is that you
> may have hit the original stocking guy with your first query. Querying
> any others will result in them looking at the wants that others shared,
> or buys, and he saw someone else had it and quoted you the same info.
It takes surprisingly little to trigger this effect/behavior. I did a bulk
buy of some 1960's era miniature vacuum tubes (500 pcs) for around 50 cents
each; the next time I looked, the price from all vendors who had them had
jumped to around $3, and it's up to $6 now. (Fortunately the vendor I
purchased from originally extended approximately his original pricing to me
again.) I think I was - and still am - virtually the only volume buyer of
these parts, but the price remains high. I've also had the same experience
with other vintage new-old-stock parts.
~~
Mark Moulding
Hi,
I've been assisting a friend with the deceased estate of a local ham
radio operator.
In among the myriad RF related items were the following;
Qty 5 HP 45632-60001 384kB Memory Module 150
Qty 1 HP 45631-60001 256kB Memory Module 150
http://www.hpmuseum.net/display_item.php?hw=383
We have no way to test, but given the condition we would assume they are
working ok.
Free for the cost of postage to anyone who wants them provided you cover
freight (From Belconnen, ACT, Australia 2616) Happy to ship overseas -
contact me off list and I can give dimensions and weight etc.
They will be off to generic computer recycling two weeks from now.
Cheers,
Hugh
Hi, All,
I'm refurbing some of my DEC equipment and I found some dirty/sticky
Boxer fans, no surprise. I managed to get one apart, cleaned and
lubed and spinning freely, then one of the grip rings shot off into
space.
I found this reference...
http://www.cirteq.com/pdfs/cirteq_technical_manual.pdf
The style in question covered on pages 85-86 (metric then standard)
One of the comments is next to a diagram of the correct type...
"Lug design for sizes 7-9-11-19-23-27"
Based on that, it's probably an NG023, since the shaft looks to be
0.250 or slightly smaller not slightly larger.
d1 == 0.236" (shaft diameter)
d3 == 0.224" (clip ID)
s == 0.039" (clip thickness)
Has anyone had to buy grip rings for their fan refurbs before? Do
these numbers sound right?
-ethan
> From: Fritz Mueller
> But then over at bisavers, I see this:
Yes, that's the panel I found the picture of in the RSTS-11 brochure a while
back:
http://www.classiccmp.org/pipermail/cctalk/2016-November/029104.html
The picture in the brochure is not very very hi-res, but Al Kossow recently
located some original photos in the DEC section of the archive, and the image
you sent the URL for is one of them.
I've been puzzling over what this thing is.
It looks 'kinda-sorta' like an RK11-C panel (the registers it shows are sort
of the RK11 registers), but if you look at the print for the "RK11-C
Indicator Connectors: RK11-C-23" (page 34 of the RK11-C Engineering Drawings
PDF), you can see the pinout, and it doesn't match.
E.g. look at the lower right line of lights on the panel: 4 bits of Bit
Counter, a blank, 8 bits of Internal Word Counter, a blank, and three bits of
Major State; now look at the RK11-C prints, connector B32: 4 bits of Bit
Counter, 8 bits of Internal Word Counter, a blank, Postamble, Checksum, Data,
Header, Preamble.
Close, but different.
One thing I have been wondering about is that "RK11-C" - that implies that
there was a -B, etc. I wonder if this panel goes with one of them? (Or perhaps
it is a custom prototype?)
I have never been able to find out anything about an earlier version of the
RK11: the earliest Peripherals Handbook that I have is the 1972 Red/White
one, and it only talks about the -C. Also, the Spare Module Handbook (a
fantastic resource, it lists the boards in almost every PDP-8/10/11 option)
mentions the -C and -D, but no other ones.
However, given the example of the KT11-B, which was totally unknown until the
documentation for one showed up with the -11/20 in Arizona, thereby proving
that there _was_ a KT11-B before the KT11-C (the -11/45's MMU), I would guess
that there likely _was_ an RK11-B, and perhaps this panel goes with that (or
an earlier one).
Any further information would be most welcome.
Noel
> I'm working on the prints now.
OK, done and uploaded:
http://ana-3.lcs.mit.edu/~jnc/tech/pdp11/RK11-C-DB_EngrDrws_Dec72.pdf
I haven't had the time to pore over them to figure out exactly what the
changes do, but they add two buffer registers (ABUF and BBUF), so they
probably offer greater resilience to DMA contention on the UNIBUS.
I don't yet know if they are used for write as well as read (the RK11-C-DB
block diagram in the prints suggests not, as it doesn't show a path from any
RK registers to the ABUF, just from the UNIBUS - i.e. only usable on reads),
or if there are any user-visible programming changes (I suspect not).
For those with an RK11-C, these prints are somewhat clearer than the prints
for the 'basic' RK11-C which are online, so although there are a number of
changes (see:
http://gunkies.org/wiki/RK11-C_disk_controller#Engineering_drawings
for info on which sheets have changes), use of these can help decipher some
of the hard-to-read pages of the 'basic' RK11-C drawings.
Also, the prints for the 'basic' RK11-C are missing a couple of pages:
18 - Disk Cable and Termination
19 - Bus "D" Drvrs and Rcvrs
which are present (albeit perhaps modified, for the second one) in this set.
Noel
let me know if you have a 90 mm summacron f2(?)
a nice working one is great! I not good inside but looks ok on the
outside let me know... we need it to go on an M2 in a display.
Ed# _www.smecc.org_ (http://www.smecc.org)
In a message dated 12/3/2016 8:24:48 P.M. US Mountain Standard Time,
cisin at xenosoft.com writes:
On Sat, 3 Dec 2016, drlegendre . wrote:
> Interesting find, thanks for posting this. I've seen this as well. with a
> batch of old ICs which had been stored (in black foam) for some 20-30
> years. The leads kind of just stayed behind in the foam..
> My assumption was that the foam was simply hygroscopic, and held enough
> atmospheric moisture & pollutants to foster corrosion.
There are numerous black foam formulations.
I inherited some lenses (including a Leitz Tele-Elmarit 180mm (<250 made))
that had been stored for a few decades in an essentially airtight case
with black foam. When I first opened the case, it seemed as though there
was liquid in the case, with an intense vinegar? smell. Second time that
I opened the case, a few hours later, it was dry and crumbly, and the
outer painted surfaces of the lenses were badly pitted and had to scrape
bits of the foam off, but NOT at all like water damage. It turned that
lens from mint condition and a major rarity, into usable but POOR cosmetic
condition (a loss of more than a thousand dollars in value!).
(Three other cases had simply disappeared between the time my buddy died
and the time that the county let us go through the house.)
Quick FYI for the bench-techs in the group.
A few months back, I became aware of this device, as well as the others
produced by the same fellow:
http://www.voltagestandard.com/DMMCheck_Plus.html
He's producing several types of low-cost, precision voltage / current /
frequency references. Prices are reasonable, especially when you consider
the re-cal program.
Any of these should be more than adequate for the vast majority of our
reference / cal requirements.
(I have no connection to the mfr. But I do like the product, and wanted to
pass it along.)
a loss indeed... Well we have the M2 body and light meter to go on top.
All we just need the lens so if you ever find another please let us know!
Thanks ! Ed#
In a message dated 12/3/2016 8:46:15 P.M. US Mountain Standard Time,
cisin at xenosoft.com writes:
> > (Three other cases had simply disappeared between the time my buddy
> > died and the time that the county let us go through the house.)
On Sat, 3 Dec 2016, COURYHOUSE at aol.com wrote:
> let me know if you have a 90 mm summacron f2(?)
> a nice working one is great! I not good inside but looks ok on
the
> outside let me know... we need it to go on an M2 in a display.
The Summicrons (I know there was a 50mm and a 90mm, but I don't know about
35mm) and the M series bodies, had been in those three cases.
And his two PBM-1000's (Micropro computer) were dumpstered.
Slim chance, but does anyone have a working Chameleon that I could clone the software off of?
They are 40mb MFM drives, I just bought two, and both units are missing the drives, making them
boat anchors. Or, slimmer yet, if someone has the software on floppy
Hello cctalk'ers,
We at the Vintage Computer Federation would like to thank everyone for
making 2016 an incredible year.
Most of you know us by now, but just in case you don't -- we're a
501(c)3 non-profit created a year ago to organize the Vintage Computer
Forum, VCF East, VCF West, and the official VCF Museum (at our NJ
headquarters). Our goals are simple -- to empower collectors and spread
awareness of computer history.
We accomplished great things in 2016. We doubled the size of our museum,
hosted the 11th edition of Vintage Computer Festival East, resurrected
the former Vintage Computer Festival West, and joined forces with the
Vintage Computer Forum.
Now we?re asking for your help to keep the momentum going. Can you make
a tax-deductible gift to us this holiday season? Over at our
contributions page you?ll find four options ? Binary ($10.00), Phreaker
($26.00), 555 Timer ($55.50), S-100 ($100), and Variable (enter your own
amount).
If you?d like to do something truly awesome, and you happen to live in
or will be traveling to the San Francisco / Silicon Valley area, then
bid on lunch with Lee Felsenstein through our friends at CharityBuzz
(https://www.charitybuzz.com/catalog_items/lunch-for-3-with-personal-computi…).
Lee is a technical and social media legend ? he was a spark behind
Community Memory, moderator of the Homebrew Computer Club, and a top
engineer for both the Processor Tech Sol-20 and Osborne-1. Bring a few
friends, have lunch with Lee at your mutual convenience, and we?ll pay
the bill!
Where will your money go? We are planning even more things for 2017 and
beyond. Vintage Computer Festival East XII will be held March 31 through
April 2 at our museum. We are currently planning Vintage Computer
Festival West XII and will announce the dates soon. We?re considering
expansion of the Festival to other cities, we?re looking to incubate
additional regional chapters, we are planning to offer more resources
online, and we?re preparing a slew of improvements to the physical
museum. If you thought we were active this year, then 2017 is going to
exhaust us ? but we love every minute of it!
If you want even your news even more frequent and granular, then you?ve
got options! Read our blog at vcfed.org, join the discussion forum
there, like us at facebook.com/vcfederation, and follow us through
twitter.com/vcfederation.
Finally, if you have questions or comments, then please feel free to
contact me directly.
Thank you,
Evan Koblentz
Director, Vintage Computer Federation
Evan at vcfed.org
