> On Apr 12, 2022, at 12:42 AM, Grant Taylor
> wrote:
>
> On 4/11/22 6:16 PM, Paul Koning wrote:
>> I think "hub" is another word for "repeater" (just like "switch" is another
>> word for "bridge").
>
> Interesting.
>
> Do you know of any documentation, preferably not marketing materials,
> On Apr 11, 2022, at 8:16 PM, Cameron Kaiser via cctalk
> wrote:
>
I still have 10 Mb Ethernet at home (on my Pro, and while it's not in use
I have a few 10Base2 bits).
>>> Please expand "my Pro". There's not much to go on.
>>> #LivingRetroVicariouslyThoughOthers
>> DEC
> On Apr 11, 2022, at 6:35 PM, Grant Taylor via cctalk
> wrote:
>
> On 4/11/22 4:18 PM, Cameron Kaiser via cctalk wrote:
>> Were there ever actual true 10b2 switches?
DECbridge-90: AUI or 10Base2 to 10Base2.
> ...
> IMHO an unmanaged switch is an evolution of a bridge. Or in the past, I
> On Apr 11, 2022, at 6:07 PM, Grant Taylor via cctalk
> wrote:
>
> On 4/11/22 2:58 PM, Paul Koning via cctalk wrote:
>> I don't have a 10Base2 switch, but I have an old repeater with 4-5 10BaseT
>> ports and a 10Base2 port. And I have a 10Base2 transceiver (as we
> On Apr 11, 2022, at 5:57 PM, Grant Taylor via cctalk
> wrote:
>
> On 4/11/22 11:27 AM, Paul Koning via cctalk wrote:
>> I still have 10 Mb Ethernet at home (on my Pro, and while it's not in use I
>> have a few 10Base2 bits).
>
> Please expand &qu
> On Apr 11, 2022, at 3:36 PM, Zane Healy wrote:
>
>
>
>> On Apr 11, 2022, at 10:27 AM, Paul Koning via cctalk
>> wrote:
>>
>> I still have 10 Mb Ethernet at home (on my Pro, and while it's not in use I
>> have a few 10Base2 bits). And I did AT
> On Apr 11, 2022, at 1:02 PM, Grant Taylor via cctalk
> wrote:
>
> Hi,
>
> Does anyone know of any communities / mailing lists / newsgroups / et al. for
> retro networking / WAN technologies?
>
> I find myself interested in (at least) the following and would like to find
> others with
> On Apr 2, 2022, at 6:27 AM, Liam Proven via cctalk
> wrote:
>
> On Sat, 2 Apr 2022 at 00:34, Bill Gunshannon via cctalk
> wrote:
>>
>> And, as you say, an Arduino or a Pi that fits in my pocket is orders
>> of magnitude more powerful and costs pocket money.
>
> The comparisons of size,
> On Apr 6, 2022, at 9:20 AM, Noel Chiappa via cctalk
> wrote:
>
> ...
> I have been told that at one point Google was 'downgrading' results that used
> plain HTTP, instead of HTTPS, because they were trying to push people to
> switch to HTTPS (this was when everyone was hyperventilating
Very impressive detail. You might give a precise source citation on that page.
paul
> On Apr 5, 2022, at 8:07 AM, Noel Chiappa via cctalk
> wrote:
>
> So, I looked at the early editions of the "pdp11 peripherals hanbook", which
> have good, detailed discussions of UNIBUS operations
> On Apr 4, 2022, at 10:55 AM, Warner Losh via cctalk
> wrote:
>
> That's what a sanitize operation does. It forgets the key and reformats the
> metadata with a new key.
Yes, but the devil is in the details. For example, for the SSD case, it is
necessary verify that the flash block that
> On Apr 4, 2022, at 10:20 AM, Jules Richardson via cctalk
> wrote:
>
> On 4/3/22 10:51, Eric J. Korpela via cctalk wrote:
>> drive removed and destroyed for privacy reason.
>
> For those in the know, how much success - assuming a "money is no object"
> approach - do data recovery
> On Apr 1, 2022, at 5:13 PM, Brent Hilpert via cctalk
> wrote:
>
> On 2022-Apr-01, at 11:51 AM, Paul Koning wrote:
>>> On Apr 1, 2022, at 2:38 PM, Brent Hilpert via cctalk
>>> wrote:
>>> On 2022-Apr-01, at 6:02 AM, Paul Koning via cctalk wrote:
>&
> On Apr 1, 2022, at 3:38 PM, Joshua Rice wrote:
>
>
>
>> On Apr 1, 2022, at 7:51 PM, Paul Koning via cctalk
>> wrote:
>>
>> Neat looking stuff. It doesn't look like core rope memory in the sense of
>> the AGC ROM, nor in the sense of
> On Apr 1, 2022, at 2:38 PM, Brent Hilpert via cctalk
> wrote:
>
> On 2022-Apr-01, at 6:02 AM, Paul Koning via cctalk wrote:
>
>> When I looked at that ebay listing of "glass memory" it pointed me to
>> another item, https://www.ebay.com/itm/265623
> On Apr 1, 2022, at 1:25 PM, Chuck Guzis via cctalk
> wrote:
>
> Wasn't some of this glass delay line memory used in early raster-scanned
> computer video displays?
I don't know about that one, but a delay line is a key component of a PAL
(European) system color TV receiver.
paul
When I looked at that ebay listing of "glass memory" it pointed me to another
item, https://www.ebay.com/itm/265623663142 -- described as "core rope memory".
Obviously it isn't -- it's conventional core RAM. Interestingly enough, it
seems to be three-wire memory (no inhibit line that I can
> On Apr 1, 2022, at 2:56 AM, Mark Huffstutter via cctalk
> wrote:
>
> Here is some pretty good information.
>
> https://archive.org/details/TNM_Glass_computer_memories_-_Corning_Electronics_20171206_0185
>
> Mark
Interesting stuff. When I saw Corning I thought glass fiber (optical pulse
> On Mar 28, 2022, at 2:12 PM, Joseph S. Barrera III via cctalk
> wrote:
>
> That was the ALOHA network, which inspired Ethernet but was not Ethernet.
The differences are quite crucial. ALOHA is a broadcast radio packet network,
which doesn't have collision detect and probably not carrier
> On Mar 22, 2022, at 1:25 PM, Magnus Ringman via cctech
> wrote:
>
> Those look like "stripline" RF/microwave packages. PCBs will have cutouts
> for the package body, so that the leads can be soldered flat (no bends)
> directly onto impedance-controlled leads on the board.
>
> On Tue, Mar
> On Mar 18, 2022, at 3:15 PM, W2HX wrote:
>
>> For a number of years they had on display the world's oldest broadcast
>> transmitter, an FM transmitter from 1919 invented in The Hague by Hanso
>> Idzerda.
>
> Interesting as that would have predated the invention of FM by Edwin Howard
>
> On Mar 18, 2022, at 1:31 PM, Dave Wade G4UGM via cctalk
> wrote:
>
> I missed a lot of this because g-mail decided to bounce some e-mails.
>
> I would like to make a couple of observations:-
>
> 1. Many real accredited museums have a smaller percentage of their artifacts
> on display
> On Mar 17, 2022, at 1:56 PM, Ethan O'Toole via cctalk
> wrote:
>
> ...
> I mean what is a museum really? What about low attendence museums versus
> private collections that serve tons of people? Aren't museums private
> collections too?
Some museums are government establishments, but
> On Mar 17, 2022, at 4:22 PM, Dave McGuire via cctalk
> wrote:
>
> On 3/17/22 14:19, Ethan O'Toole via cctalk wrote:
>>> In LSSM's case, it's a wholly-occupied 14,000 square foot commercial
>>> storefront building that nobody lives in, in a downtown shopping district,
>>> as
> On Mar 17, 2022, at 9:30 AM, Tom Hunter via cctalk
> wrote:
>
> Dave,
>
> Your following comment is offensive:
>
> "I hope these systems go to a good home, and don't disappear into the black
> hole of a private collection."
>
> You equate private collections with black holes. I think on
> On Mar 16, 2022, at 10:28 PM, Chris Zach via cctalk
> wrote:
>
>> I vividly recall a log by an operator who had a bad CDC 844 pack who
>> proceeded to destroy 5 drives and 3 additional packs. It was detailed
>> enough that it read like Gerard Hoffnung's "Bricklayer's Story".
>
> When I
> On Mar 15, 2022, at 1:18 PM, Bill Gunshannon via cctalk
> wrote:
>
> On 3/15/22 12:57, Paul Koning wrote:
>>> ...
>
One difference is that GDB will be able to do COBOL mode debugging.
>>>
>>> Never had a reason to try it but I thought GnuCOBOL allowed the use
>>> of GDB. FAQ seems
> On Mar 15, 2022, at 12:39 PM, Bill Gunshannon via cctalk
> wrote:
>
> On 3/15/22 09:12, Paul Koning wrote:
>>> On Mar 14, 2022, at 9:05 PM, Bill Gunshannon via cctalk
>>> wrote:
>>>
>>> On 3/14/22 20:53, Paul Koning via cctalk wrote:
>
> On Mar 14, 2022, at 9:05 PM, Bill Gunshannon via cctalk
> wrote:
>
> On 3/14/22 20:53, Paul Koning via cctalk wrote:
>> Saw a note on the GCC list that I thought some here might find interesting:
>> it announces the existence (not quite done but getting there)
Saw a note on the GCC list that I thought some here might find interesting: it
announces the existence (not quite done but getting there) of a COBOL language
front end for GCC. Interesting. For those who deal in legacy COBOL
applications that want a more modern platform, I wonder if this
> On Mar 4, 2022, at 4:06 PM, Peter Coghlan via cctalk
> wrote:
>
>>
>> I have several difficult slides in my H960 rack.
>> What is the best lubricant for the slides?
>> I was wondering if graphite would work better than oil due to the fact that
>> it won't pick up dirt and dust.
>
>
> On Mar 2, 2022, at 11:45 AM, Chris Elmquist via cctalk
> wrote:
>
> On Tuesday (03/01/2022 at 04:36PM -0800), Marc Howard via cctech wrote:
>> I've got a PDP 11/34 I've never opened up. It's mounted in a H9642
>> cabinet. I can't get the bloody thing to extend on the chassis track
>>
> On Feb 26, 2022, at 3:05 PM, Rob Jarratt wrote:
>
>> ...
>> Hardware stores can fix that. Or Brownells, where you can get really good
>> screwdrivers that are less likely to damage screw heads than standard
>> hardware store ones do.
>
> I am not in the USA, but I am should be able to
> On Feb 26, 2022, at 3:14 AM, Rob Jarratt via cctalk
> wrote:
>
> I am wondering if I have racked my 11/24 correctly.
>
>
>
> As you can see here:
> https://robs-old-computers.com/2022/02/10/pdp-11-24-progress/ I have put the
> CPU at the top and the two RL02 drives underneath.
That
> On Feb 24, 2022, at 1:16 PM, Brent Hilpert via cctalk
> wrote:
>
> On 2022-Feb-24, at 8:29 AM, Clemar Folly via cctalk wrote:
>>
>> I'm looking for information about Texas Instruments TB-759933 IC.
>>
>> Does anyone have the datasheet or any other information about this IC?
>
>
> A
> On Feb 23, 2022, at 12:38 PM, Ethan Dicks via cctalk
> wrote:
>
> On Tue, Feb 22, 2022 at 9:29 PM Rod Smallwood via cctalk
> wrote:
>> 2. The PC I want to use is a DEC Celeibris FX ie the PC and its W95
>> software is as supplied by DEC.
> .
> .
> .
>> 5. putR was supposed to be able to
I think you're unnecessarily limiting your options by refusing to use Linux,
which as we've pointed out is something you can do on your existing PC without
overwriting the OS that is on it now.
As for SIMH, I am quite convinced that it IS a perfectly good answer. But
sure, if you have all the
> On Feb 22, 2022, at 7:33 PM, Fred Cisin via cctalk
> wrote:
>
> From the FDC point of view, which doesn't have optical view of the drive and
> media, the 80 track DD 5.25" looks similar to a "720K 3.5" drive.
> (80 tracks, 9 sectors per track, 300 RPM, 250K data transgfer rate)
>
> On
You could boot a packaged Linux that doesn't need installation but runs
directly from the boot device. I haven't done this but I know they are out
there and easy to use.
SimH complex and lots of setup? Not my experience. The documentation may be
sparse in places, as I found when configuring
> On Feb 22, 2022, at 12:27 PM, Joshua Rice via cctalk
> wrote:
>
> I have a generic 5.25” (not sure of brand) in my dell GX1 but it writes plain
> SSDD floppies in RX50 format no problem.
>
> The RX33 was a pretty standard PC floppy drive AFAIK, just configured (with
> jumpers) to work
> On Feb 21, 2022, at 10:11 PM, Zane Healy via cctalk
> wrote:
>
> On Feb 21, 2022, at 4:32 PM, Rod Smallwood via cctalk
> wrote:
>>
>> Hi
>>
>> I have built an 11/83 in a BA23 box.
>>
>> It has a KDJ-11B, 2mB PMI memory, an RQDX3 with an RX50 attached,
>>
>> Plus a CMD CQD 220A
> On Feb 21, 2022, at 6:07 PM, Guy Fedorkow wrote:
>
> hi Paul,
> Yes, I should have said -- I'm looking for a machine that can punch under
> control of a computer.
> Whirlwind actually used seven-bit Flexowriters for reading and punching
> (along with a high-speed reader later on), but
> On Feb 21, 2022, at 7:32 PM, Rod Smallwood via cctalk
> wrote:
>
> Hi
>
> I have built an 11/83 in a BA23 box.
>
> It has a KDJ-11B, 2mB PMI memory, an RQDX3 with an RX50 attached,
>
> Plus a CMD CQD 220A Disk controller with a digital RH18A 2Gig SCSI drive
> attached.
>
> Diag
> On Feb 21, 2022, at 4:26 PM, Guy Fedorkow via cctalk
> wrote:
>
> [apologies if this is a dup, but I didn't see it coming back in any of the
> cctalk digests]
>
> Greetings CC-Talk,
> I've been working on a low-budget project to help to introduce students to
> history of computing
> On Feb 19, 2022, at 1:28 PM, Jon Elson via cctalk
> wrote:
>
> On 2/18/22 21:43, ben via cctalk wrote:
>>
>> The 70's was all low scale tech. I suspect it was the high speed/edge rates
>> more the power that kept ECL from common use. Any other views on this topic.
>> Ben, who only had
> On Feb 18, 2022, at 4:30 PM, Chris Zach via cctalk
> wrote:
>
>> XMI already existed as the system bus for the VAX 6000 series machines.
>> I/O on the VAX 6000's was via an XMI-to-BI bridge. I don't remember the
>> exact performance specs on XMI, but it was wider and faster than BI.
> On Feb 18, 2022, at 3:18 PM, Gary Grebus wrote:
>
> On 2/18/22 09:46, Paul Koning wrote:
>> ...The 9000 also had its own I/O bus, XMI, different from BI. I don't know
>> how its performance compares, whether it was worth the effort.
>
> XMI already existed as the system bus for the VAX
> On Feb 18, 2022, at 12:16 PM, Lee Courtney wrote:
>
> Paul,
>
> What was the timeframe for the MPP?
I thought late 1980s. Just did some searching, which turns up some manuals for
the "DecMPP 12000". And a trade press article that says it's a rebadged MasPar
machine.
> On Feb 18, 2022, at 7:08 AM, Joerg Hoppe via cctalk
> wrote:
>
> Hi,
>
> my computer club c-c-g.de could acquire the remains of a VAX9000 !
> The machine ran at the GWDG computing center in Göttingen, Germany, around
> 1993.
> Parts of it were in stock of their museum for 20+ years.
>
>
> On Feb 11, 2022, at 2:52 PM, Jonathan Stone via cctalk
> wrote:
>
>
> If available, I'd like to purchase a bunch.
FWIW: it would not be all that hard to convert from readily available USB (or
PS2) mice to DEC protocol. I did the analogous work for keyboards (LK201) on
Arduino. That
> On Feb 9, 2022, at 11:11 AM, Mike Katz via cctalk
> wrote:
>
> I am in the process or restoring a TU56 so it's in pieces. Pictures of the
> head were requested so here they are.
>
> These were taken with my phone so the quality is only mediocre.
>
> This, like the rest of the drive, is
> On Feb 8, 2022, at 5:14 PM, Wayne S via cctech wrote:
>
> Searched a lille bit for Western Magnetics. Here’s a site that has some
> surplus heads, even a western magnetics onebut probably not the correct one.
> There is a corporate charter record for Western Magnetics in Minnesota dated
> On Feb 8, 2022, at 4:04 PM, Ron Pool via cctech wrote:
>
>> So it sermsdectape heads are special. I don’t think Dec would have the
>> desire to make them internally so they probably contractef with a company
>> already set up to do that. Who were the big tape head manufacturers at that
> On Feb 8, 2022, at 2:53 PM, Wayne S via cctech wrote:
>
> Since so many audio tape players and computer magtape units were made it
> would stand to reason that there has to be a stash somewhere of tape heads
> and it’s just a matter of finding where they are.
> Are there any part numbers
> On Feb 8, 2022, at 2:34 PM, Douglas Taylor via cctalk
> wrote:
>
> Update on this: I did put together a battery and voltage divider to test the
> AXV11. The label on the A/D module says it brings the output from the
> multiplexer to one of the external pins. I was able to verify that
> On Feb 2, 2022, at 1:20 PM, John Ames via cctalk
> wrote:
>
>> Back in the bad old days of the 5160 PC, some DTC controllers allowed for
>> partitioning a drive (using witch settings)
> I think "witch settings" is my new preferred term for this. They're
> certainly mysterious and arcane
> On Feb 1, 2022, at 6:46 PM, Jon Elson via cctalk
> wrote:
>
> On 2/1/22 15:40, Paul Koning via cctalk wrote:
>>
>>> On Feb 1, 2022, at 4:31 PM, Grant Taylor via cctalk
>>> wrote:
>>>
>>> On 2/1/22 11:23 AM, Paul Koning via cctalk
> On Feb 1, 2022, at 6:00 PM, Warner Losh via cctalk
> wrote:
>
> On Tue, Feb 1, 2022 at 12:42 PM Grant Taylor via cctalk <
> cctalk@classiccmp.org> wrote:
>
>> On 2/1/22 2:14 AM, Joshua Rice via cctalk wrote:
>>> There's several advantages to doing it that way, including balancing
>>> wear
> On Feb 1, 2022, at 5:08 PM, Chuck Guzis via cctalk
> wrote:
>
> On 2/1/22 13:40, Paul Koning via cctalk wrote:
>>
>
>> With MSCP, DEC switched to addressing disks by sector offset, as SCSI did
>> later, rather than by geometry (cylinder, track, sec
> On Feb 1, 2022, at 4:31 PM, Grant Taylor via cctalk
> wrote:
>
> On 2/1/22 11:23 AM, Paul Koning via cctalk wrote:
>> Did any DEC MSCP disks use it?
>
> Please expand "MSCP". My brain is failing to do so at the moment.
Mass Storage Control Protocol
> On Feb 1, 2022, at 2:42 PM, Grant Taylor via cctalk
> wrote:
>
> On 2/1/22 2:14 AM, Joshua Rice via cctalk wrote:
>> There's several advantages to doing it that way, including balancing wear on
>> a disk (especially today, with SSDs), as a dedicated swap partition could
>> put undue wear
> On Feb 1, 2022, at 1:03 PM, Chuck Guzis via cctalk
> wrote:
>
> On 2/1/22 09:16, Mike Katz via cctalk wrote:
>> In the rotating drive world there is constant linear velocity (CLV) and
>> constant angular velocity (CAV) drives.
>>
>> On CLV drives the speed of rotation would vary based on
> On Feb 1, 2022, at 1:09 PM, Glen Slick via cctalk
> wrote:
>
> On Tue, Feb 1, 2022 at 10:04 AM Paul Koning via cctalk
> wrote:
>>
>>> Slower on the outer tracks, I believe. CDs work this way.
>>
>> I suspect CLV was invented for CDs, in f
> On Feb 1, 2022, at 12:21 PM, Paul Koning via cctalk
> wrote:
>
>> On Feb 1, 2022, at 12:16 PM, Mike Katz via cctalk
>> wrote:
>>
>> In the rotating drive world there is constant linear velocity (CLV) and
>> constant angular velocity (CAV)
> On Feb 1, 2022, at 12:21 PM, Paul Koning via cctalk
> wrote:
>
>
>
>> On Feb 1, 2022, at 12:16 PM, Mike Katz via cctalk
>> wrote:
>>
>> In the rotating drive world there is constant linear velocity (CLV) and
>> constant angular velocity
> On Feb 1, 2022, at 12:16 PM, Mike Katz via cctalk
> wrote:
>
> In the rotating drive world there is constant linear velocity (CLV) and
> constant angular velocity (CAV) drives.
>
> On CLV drives the speed of rotation would vary based on the track (slower in
> the inner tracks and faster
> On Feb 1, 2022, at 5:02 AM, Liam Proven via cctalk
> wrote:
>
> ...
> I suggested making a D: drive and putting the swap file on it -- you
> saved space and reduced fragmentation.
>
> One of our favourite small PC builders, Panrix, questioned this. They
> reckoned that having the swap
> On Jan 31, 2022, at 7:35 PM, Noel Chiappa via cctalk
> wrote:
>
>> From: Tom Gardner
>
>> You define logical disks by assigning a logical disk unit number to a
>> file on a physical disk. You can then use the logical disk as though it
>> were a physical disk.
>
> To me, 'partition'
> On Jan 31, 2022, at 2:01 PM, Tom Gardner via cctalk
> wrote:
>
> There is a discussion of the origin of the term "partition" in storage
> devices such as HDDs at:
> https://en.wikipedia.org/wiki/Talk:Disk_partitioning#Where_did_the_term_%22p
> artition%22_originate?
>
> It seems clear it
> On Jan 31, 2022, at 11:04 AM, Noel Chiappa via cctalk
> wrote:
>
>> From: Bob Smith
>
>> the original UART was designed by DEC, Vince Bastiani was the project
>> lead and designer, Gordon Bell was behind the project, and it may have
>> been his idea.
>
> "Computer Engineering: A DEC View
> On Jan 30, 2022, at 4:44 PM, John Forecast via cctalk
> wrote:
>
> ...
> Is it possible that the DMX11 was a CSS product?
Clearly it is; the Option/Module list (1983 edition, from Bitsavers) says so.
It shows the controller and three different 64 port line units, for different
signal
> On Jan 30, 2022, at 2:43 PM, Chris Zach via cctalk
> wrote:
>
> ...
> From what I can see, the the kmc11 was an M8204 single board which is
> different from the 8200 used in the dmc11. I had a DMC11 somewhere.
>
> From the books, the kmc11 had an "lsi11 on board", 1k of 16 bit ram, 1k
> On Jan 29, 2022, at 3:58 PM, Noel Chiappa via cctalk
> wrote:
>
>> From: Paul Koning
>
>> DH-11 is unusual in that it has DMA in both directions
>
> McNamara's DH11? (I don't know of another DECdevice of that name.) Per:
>
>
>
> On Jan 29, 2022, at 12:28 AM, Chris Zach via cctalk
> wrote:
>
> Old question: I'm looking through some old reports from 1977 about a failed
> DEC project with the DMX11 multiplexer system and there is reference to the
> following key items:
>
> 1) The DMX was designed to handle block
> On Jan 26, 2022, at 1:28 PM, Tom Gardner via cctalk
> wrote:
>
> ...The UNISERVO I, of Univac I, tape drives had a separate spool of clear
> very thin film that was clock motor wound across the head when tape was
> moving, since the phosphor bronze plated tape was very abrasive. That
>
> On Jan 25, 2022, at 3:13 PM, Bjoren Davis via cctalk
> wrote:
>
>
> On 1/25/2022 9:18 AM, Paul Koning via cctalk wrote:
>>
>>> On Jan 24, 2022, at 10:27 PM, Gary Oliver via cctech
>>> wrote:
>>>
>>>> ...
>>>
>&
> On Jan 24, 2022, at 10:27 PM, Gary Oliver via cctech
> wrote:
>
>> ...
>
> As to the real reason I was doing this: Most of my tapes are un-boxed and
> have suffered being in a dusty area (before I got them) with the dust forming
> a sort of 'crust' on the outside of the tape. It's only
> On Jan 25, 2022, at 1:13 AM, Chuck Guzis via cctalk
> wrote:
>
> So, can we assume that the words about a "tape sandwich" refer to a
> mylar base, oxide coating, and a lubricant/protective coating?
>
> That is not an oxide coating sandwiched between to layers of mylar.
The 3M spec for
> On Jan 24, 2022, at 5:57 PM, ben via cctalk wrote:
>
>> ...
> Document source is also a problem.
> You would want to keep scan it at the best data format,
> not something in a lossey format.
That's true generally. Anything other than actual photographs (continuous tone
images) should NOT
> On Jan 24, 2022, at 2:46 PM, Chuck Guzis via cctalk
> wrote:
>
> On 1/24/22 11:05, Paul Koning via cctalk wrote:
>
>> Looking at that spec some items pop out.
>>
>> The coating is quite thin, much thinner than the backing. Not too
>> surpris
> On Jan 23, 2022, at 8:40 PM, Noel Chiappa via cctalk
> wrote:
>
>> From: Gary Oliver
>> I've always thought the physical tape wound on a DECtape spool was a
>> fairly conventional 'sandwich' of mylar/oxide/mylar ...
>> Was there some kind of 'lubricating' coat on the data side? It makes
>>
> On Jan 24, 2022, at 10:56 AM, Jon Elson via cctalk
> wrote:
>
> Back in 1971 or so, we had a PDP-5 with DECTapes, and bought 3/4" analog
> recorder tapes surplus to make up new tapes. It was much thinner than
> DECTape, and we had print-through issues of tapes that were stored for a few
> On Jan 23, 2022, at 8:40 PM, Noel Chiappa via cctalk
> wrote:
>
>> From: Gary Oliver
>
>> I've always thought the physical tape wound on a DECtape spool was a
>> fairly conventional 'sandwich' of mylar/oxide/mylar ...
>> Was there some kind of 'lubricating' coat on the data side? It makes
> On Jan 23, 2022, at 12:09 PM, Gavin Scott wrote:
>
> On Sun, Jan 23, 2022 at 9:11 AM Paul Koning via cctalk
> wrote:
>> One consideration is the effort required to repair transcription errors.
>> Those that produce syntax errors aren't such an issue;
>>
I've run into that situation too, with listings so difficult that even a
commercial OCR program (FineReader) couldn't handle it. At the time Tesseract
was far less capable, though I haven't tried it recently to see if that has
changed.
Anyway, my experience was that the task was hard enough
I'm looking for a manual I can't find on Bitsavers: a DECnet/10 programming
manual. The reason: trying to read PSTHRU.MAC and realizing that I was trying
to understand DECnet-10 code while reading the DECnet-20 programming manual.
Oops.
paul
No, Heartbleed was a protocol specification error, where if you implemented
what the spec said you automatically produced a security bug.
paul
> On Jan 11, 2022, at 3:02 PM, Jonathan Katz via cctalk
> wrote:
>
> Heartbleed?
>
>
> On Tue, 11 Jan 2022 at 20:00, Hauke Fath via cctalk
> On Jan 6, 2022, at 2:11 PM, Chuck Guzis via cctalk
> wrote:
>
> On 1/6/22 10:17, William Donzelli wrote:
>> If you include prototypes, then you need to include ALL the prototypes
>> - even things made in single quantities that never worked.
>>
>> That is a HUGE amount of stuff that makes
> On Jan 6, 2022, at 4:06 AM, Brent Hilpert via cctalk
> wrote:
>
> On 2022-Jan-06, at 12:19 AM, Joshua Rice via cctech wrote:
>> Not cost effective at nearly $10,000! I understand they're very rare, given
>> they were only used for a few years in industry and they're clocking on 3/4
>> of
> On Jan 4, 2022, at 7:08 PM, Jonathan Chapman via cctalk
> wrote:
>
>> much of it related to Niagara Falls and other power systems
>> modeled after it.
>
> The IIRC oldest US generating station still in operation (on original
> hardware anyway) is at Mechanicville, NY. It is hydroelectric
> On Jan 4, 2022, at 12:00 PM, Adrian Stoness via cctalk
> wrote:
>
> you can use a vfd drives to get 3phase power from single u just gotta size
> them bigger then the load u would normally need
I've said that too, and I've been told that this is not a good idea for power
supplies.
> On Jan 4, 2022, at 10:40 AM, Grant Taylor via cctalk
> wrote:
>
> On 1/4/22 12:14 AM, Chuck Guzis via cctalk wrote:
>> Seymour Cray, along with Bill Norris and Jim Thornton and others left
>> Remington Rand/UNIVAC after Rand bought the near-bankrupt ERA. Apparently,
>> the work
I just added a patch to https://github.com/pkoning2/decstuff, in
patches/shut.cmd, which cures a problem in RSTS V10.1 that seems to come and go
with no clear pattern. The failure is a crash, sometimes a halt, during system
shutdown. The cause was a write to the wrong location when removing
> On Jan 3, 2022, at 3:36 PM, Chuck Guzis via cctalk
> wrote:
>
> On 1/3/22 10:58 AM, Paul Koning via cctalk wrote:
>> The discussion about 3-phase made me check some documentation.
>
>> I also looked at some CDC 6000 series docs. Those used 400 Hz 3 phas
The discussion about 3-phase made me check some documentation.
The drive I remembered that uses 3-phase power is the RP04. I remember a
warning to the installer to verify the phase order; if that's wrong the drive
will try to spin up in the wrong direction, which might partially unscrew the
> On Jan 1, 2022, at 4:19 PM, Josh Dersch via cctalk
> wrote:
>
> On Sat, Jan 1, 2022 at 12:47 PM Guy Dunphy via cctalk
> wrote:
>
>> ...
>> But you're all focussed on that, and missing another important detail. The
>> machine has a liquid cooling system.
>> ...
>
> For clarification --
> On Jan 1, 2022, at 3:08 PM, Grant Taylor via cctalk
> wrote:
>
> On 1/1/22 12:44 PM, Paul Koning via cctalk wrote:
>> ...
>> And of course 400 Hz gave them an additional advantage in reduced
>> transformer size and reduced ripple (for a given filter capacitor
> On Jan 1, 2022, at 2:38 PM, Grant Taylor via cctalk
> wrote:
>
> On 1/1/22 12:33 PM, Paul Koning via cctalk wrote:
>> And mainframes may use 3-phase power supplies; CDC 6000 mainframes do,
>> though with those it's 3 phase 400 Hz produced by motor-generators (whi
> On Jan 1, 2022, at 2:21 PM, Grant Taylor via cctalk
> wrote:
>
> On 1/1/22 12:17 PM, Dennis Boone via cctalk wrote:
>> IIRC nothing in the VAX cpu actually requires 3 phase. The PDU(s) just eat
>> that from the wall.
>
> I think that's the same with all the /computer/ equipment that
> On Jan 1, 2022, at 1:46 PM, Bill Gunshannon via cctalk
> wrote:
>
> On 1/1/22 1:40 PM, Paul Koning via cctalk wrote:
>>> On Jan 1, 2022, at 1:12 PM, Noel Chiappa via cctalk
>>> wrote:
>>>
>>> This:
>>>
>>>
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