On 4/5/19 6:13 PM, Al Kossow via cctalk wrote:
> I had to re-thread the UNISERVO that is on display at CHM. I have to try
> to find my pictures that I took.
>
> http://bitsavers.org/pdf/univac/magtape/PX899_Mechanical_Parts_of_UNISERVO_Apr58.pdf
>
> show it.
>
My guess on the vintage of these
the other thing I had wondered about was how they kept metal tape from
destroying the head. there is a spool of plastic tape that goes between
the head and the tape
On 4/5/19 6:13 PM, Al Kossow via cctalk wrote:
>
>
> On 4/5/19 5:45 PM, Chuck Guzis via cctalk wrote:
>
>> Univac had an
On 4/5/19 5:45 PM, Chuck Guzis via cctalk wrote:
> Univac had an interesting setup for Uniservo tape drives--I see a lot of
> reels with a short (maybe 6") "leader" with a hole spliced onto tapes.
> I'm not sure how that worked
I had to re-thread the UNISERVO that is on display at CHM. I have
On 4/5/19 5:31 PM, Paul Koning via cctalk wrote:
> If this works, which is most of the time, it's a great time saver. As an
> operator you just hang the reel on the spindle, hit "load" and walk away to
> the next task.
>
> I think IBM may have originated this magic; several of the later DEC
> On Apr 5, 2019, at 7:15 PM, Grant Taylor via cctalk
> wrote:
>
>> ...
>> But basically, just behind the "hook", there's a black plastic latch. When
>> closed, it tensions the white band.
>> https://www.electronicsurplus.it/open2b/var/products/27/92/0-d95b2a25-800.jpg
>
> ACK
>
> I'm
On Fri, Apr 5, 2019 at 4:54 PM Chuck Guzis via cctalk
wrote:
> On 4/5/19 4:15 PM, Grant Taylor via cctalk wrote:
>
> > ACK
> >
> > I'm getting the mental impression that it's somewhat like a spring form
> > pan. The latch opens and releases tension off of the strip that goes
> > around the tape
On 4/5/19 4:15 PM, Grant Taylor via cctalk wrote:
> ACK
>
> I'm getting the mental impression that it's somewhat like a spring form
> pan. The latch opens and releases tension off of the strip that goes
> around the tape reel. When it's latched, it cinches against it. When
> it's unlatched,
What I want to know is, how do front panels of historic computers so
often get separated from the rest of the computer?
Could be just storage problems. The main computer here, racks of stuff there,
cables and panel there, and things get lost over time.
The moosehead is still hanging on the
On 4/5/19 4:44 PM, Chuck Guzis via cctalk wrote:
The IRS facility photo used the IBM style; not flexible, but rather a
two-part sliding rigid plastic arrangement. I think that the IRS also
used a robotic "picker.
I'd hazard a guess that the IRS acquired theirs from IBM. Even if they
are
I've had a plan to set up a raspberry Pi as the mopd and NFS server to bit
my vaxstation for a while. To be a self contained demo I could probably fit
it inside the vaxstation.
One of the annoyances is that it would need another power cord and need a
place to mount it inside.
It occurs to me
On Fri, 5 Apr 2019, Chuck Guzis via cctalk wrote:
On 4/5/19 2:58 PM, Grant Taylor via cctalk wrote:
On 4/5/19 3:20 PM, Chuck Guzis via cctalk wrote:
See how each reel of tape hangs from a slot in a horizontal bar? Those
white-and-black strips wrapped around the tapes are what I'm referring
to
On 4/5/19 2:58 PM, Grant Taylor via cctalk wrote:
> On 4/5/19 3:20 PM, Chuck Guzis via cctalk wrote:
>> See how each reel of tape hangs from a slot in a horizontal bar? Those
>> white-and-black strips wrapped around the tapes are what I'm referring
>> to as being deteriorated.
>
> How does that
On 4/5/2019 10:06 AM, Fred Cisin via cctalk wrote:
What I want to know is, how do front panels of historic computers so
often get separated from the rest of the computer?
Could be just storage problems. The main computer here, racks of stuff
there, cables and panel there, and things get lost
A general discussion of population count:
https://stackoverflow.com/questions/8590432/when-to-use-parallel-counting-mit-hakmem-for-bitcount-when-memory-is-an-issue
At 08:49 PM 5/04/2019 +, you wrote:
>Hi Kyle,
>
>hat's a really interesting problem, and the government (NSA) wanted this badly
>and done FAST.
>
>they asked Seymour Cray to create a specific instruction for this and they
>called it 'population count'
>
>Anybody know the why and how it is
On 4/5/19 3:20 PM, Chuck Guzis via cctalk wrote:
See how each reel of tape hangs from a slot in a horizontal bar?
Those white-and-black strips wrapped around the tapes are what I'm
referring to as being deteriorated.
How does that come off the reel?
Does the reel slide out? Does it unlatch?
On 4/5/19 1:49 PM, Ali via cctalk wrote:
>> I hit on the idea of using 16mm move film plastic "cans". Much to my
>> surprise, I found that there is still an active market for these
>> things.
>
> Chuck,
>
> For the uneducated amongst us exactly what are you referring to? Are you
> talking
> On Apr 5, 2019, at 4:49 PM, Randy Dawson via cctalk
> wrote:
>
> Hi Kyle,
>
> hat's a really interesting problem, and the government (NSA) wanted this
> badly and done FAST.
>
> they asked Seymour Cray to create a specific instruction for this and they
> called it 'population count'
>
> I hit on the idea of using 16mm move film plastic "cans". Much to my
> surprise, I found that there is still an active market for these
> things.
Chuck,
For the uneducated amongst us exactly what are you referring to? Are you
talking about the plastic can where the tape sits in? Or the strap
Hi Kyle,
hat's a really interesting problem, and the government (NSA) wanted this badly
and done FAST.
they asked Seymour Cray to create a specific instruction for this and they
called it 'population count'
Anybody know the why and how it is useful?
I am deep in matrix math books and
On Fri, Apr 5, 2019 at 3:16 PM Mark Matlock via cctalk
wrote:
> Subject: Re: Yes there is a PDP 10 front panel and Kenbak on Ebay
>The other thing that happened on PDP-11/70s was that if your system
> was maintained by DEC, the field service group would want to install
> the KY11-RE Remote
Subject: Re: Yes there is a PDP 10 front panel and Kenbak on Ebay
> > From: Guy Dunphy
>
> > What I want to know is, how do front panels of historic computers so
> > often get separated from the rest of the computer?
>
The other thing that happened on PDP-11/70s was that if your
From: Kyle Owen via cctalk: Friday, April 05, 2019 8:59 AM
Just wondering if anyone has come up with a fast way to count the number of
1s in a word on a PDP-8. The obvious way is looping 12 times, rotating the
word through the link or sign bit, incrementing a count based on the value
of the link
I've noted earlier that the vinyl "hanger strips" for 1/2" magnetic tape
have been degrading, becoming brittle and simply breaking away,
sometimes in small particles.
So I set off looking for a low-cost substitute--any hangers that I could
rustle up would probably be on their last legs at this
Here's a list of some more stuff if anyone is interested in making
reasonable offers. Probably the last I will have before my demise
when my wife will likely send everything that's left to the skip.
MODULE DescriptionQTY
NUMBER
M9202
I suppose you could test each nybble for zero, then equate a 16-element LUT
on nybbles not zero?
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com
On Fri, Apr 5, 2019 at 11:59 AM Kyle Owen via cctalk
wrote:
> Just wondering if anyone has come up with a fast way to count the number of
> 1s
What I want to know is, how do front panels of historic computers so
often get separated from the rest of the computer?
The moosehead is still hanging on the wall.
But, the backside of the moose is no longer on the other side of that
wall.
Just wondering if anyone has come up with a fast way to count the number of
1s in a word on a PDP-8. The obvious way is looping 12 times, rotating the
word through the link or sign bit, incrementing a count based on the value
of the link or sign.
With a small lookup table, you can reduce the
On Fri, Apr 5, 2019 at 11:32 AM Noel Chiappa via cctalk <
cctalk@classiccmp.org> wrote:
> > From: Guy Dunphy
>
> > What I want to know is, how do front panels of historic computers so
> > often get separated from the rest of the computer?
>
>
>
> Here's what probably happened: the
> From: Guy Dunphy
> What I want to know is, how do front panels of historic computers so
> often get separated from the rest of the computer?
I suspect it probably happened a while back, before the start of the vintage
computer movement; you need to look at the decisions from the
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