Re: Raised Floors

[Stefan Skoglund via cctalk]

fre 2019-05-24 klockan 23:38 -0700 skrev Chuck Guzis via cctalk:
> On 5/24/19 9:12 PM, Carlos E Murillo-Sanchez via cctalk wrote:
> 
> > Sulfuric acid is hard to wash off; the amount that made it to the
> > room
> > must have been pretty small, otherwise people couldn't be allowed
> > in. 
> > And, if it was bad enough to corrode boards, imagine what that
> > would do
> > to your lungs and all mucous membranes in your body...
> 
> In my limited experience, there's nothing much worse than
> concentrated
> hydrochloric acid. A contain of the stuff inadvertently left open
> will
> soon corrode anything corrodable in the room.  HF may be worse; I
> don't
> know.
> 

HCl is a gas dissolved in water.

At room temperatures (or higher) it will gas off
but because of the air moisture tiny drops of liquid HCl will form
instantenously.

Add water until around 25 percent concentration should stop most of the
gasification.

UNIVAC 422 material acquisitions updates..

[ED SHARPE via cctalk]

UNIVAC 422 Training  Computer  material acquisitions updates..


- UNIVAC 422 Training  Computer program Instruction reference cards   -  (4 
each)- Photograph  of  students  using one  in an educational environment (1 
each)- Applications programs description sheets  fro  2  programs ( 1  each ,  
2  programs)- UNIVAC 422 Partial Maintenance Manual  (1 each)-UNIVAC Card 
Spares  suitcase -  some dividers-   removed  (1 each)

The   Game is  Afoot! Please  check  your  files  for ANYTHING  related to  the 
 UNIVAC  422  or  UDT  Training  computers!  -   Ed Sharpe -   Archivist   for 
SMECC

Re: Raised Floors

[Adrian Stoness via cctalk]

>
> acid water hah i work around ph 2.38 water liming it during the summer.
> insane how fast it will eat steel out
>

9895A Flexible Disc Memory For Sale

[MEBA via cctalk]

I have an old floppy disk drive by Hewlett-Packard, their 9895A Flexible
Disc Memory. We got this from an estate cleanout and I would like to sell
it. It has been powered up and one bay door works when the button is pressed
and the other doesn't. It is a large, very heavy machine. I have it on ebay
for $299 ( 
https://www.ebay.com/itm/254242280384) but that was just a shot in the dark.
Any reasonable offer considered.

 

Mark

m...@meba.com

 

UNIVAC 422 material acquisitions updates..

[ED SHARPE via cctalk]

UNIVAC 422 Training  Computer  material acquisitions updates..


- UNIVAC 422 Training  Computer program Instruction reference cards   -  (4 
each)- Photograph  of  students  using one  in an educational environment (1 
each)- Applications programs description sheets  fro  2  programs ( 1  each ,  
2  programs)- UNIVAC 422 Partial Maintenance Manual  (1 each)-UNIVAC Card 
Spares  suitcase -  some dividers-   removed  (1 each)

The   Game is  Afoot! Please  check  your  files  for ANYTHING  related to  the 
 UNIVAC  422  or  UDT  Training  computers!  -   Ed Sharpe -   Archivist   for 
SMECC

Re: Damaged LTO tapes

[Zane Healy via cctalk]

> On May 24, 2019, at 8:28 PM, Aaron Taylor  wrote:
> 
> On Fri, May 24, 2019 at 02:29:09PM -0700, Zane Healy via cctalk wrote:
>> Anyone have any experience on how hard it is to damage an LTO tape.  I mean
>> damage them to the point they split at the seam.
> 
> I've abused some LTO tapes pretty badly but never managed to split one open.
> 
> A tape library I purchased on eBay turned out to be full of 32 tapes. They all
> came loose in transit and bounced around inside. The impacts were enough to
> destroy both tape drives and the picker mechanism, as well as put some serious
> gouges in the interior of the library. Despite this, 31/32 tapes worked
> flawlessly and are still in use multiple years later, having passed through my
> backup system multiple times. The damaged tape just had a broken plastic hinge
> on the little door that flips open to expose the tape leader.
> 
> It's only a single data point (or is it 32? :-), so take it for what it's 
> worth.
> 
> Aaron

Realistically that’s sort of what I’d expect from LTO tapes.  I’ve never abused 
them like I have abused SDLT tapes.  Mainly because I’ve never had the chance.  
I know it’s amazingly hard to visibly damage SDLT tapes.

Zane

RE: Damaged LTO tapes

[Tom Gardner via cctalk]

Based upon my interviews for the Computer History Museum of IBM personnel
involved in the development of LTO and its medium, I'd expect it to be very
difficult to damage an LTO tape
See: https://www.computerhistory.org/collections/catalog/102738025
particularly sessions 1 and 5

Tom

-Original Message-
From: Zane Healy [mailto:heal...@avanthar.com] 
Sent: Friday, May 24, 2019 2:29 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Damaged LTO tapes

Anyone have any experience on how hard it is to damage an LTO tape.  I mean
damage them to the point they split at the seam.

Zane

Re: IBM 1620 manuals

[Jon Elson via cctalk]

On 05/13/2019 10:57 PM, Jon Elson via cctalk wrote:
I just discovered a binder with 2 IBM 1620 manuals.  A 
quick check shows bitsavers has these and newer editions 
of them.


So, does anybody want :

IBM 1620 Central Processing Unit, Model 2  (Form A26-5781-1)

and

IBM 1620 Monitor II System Reference Manual (Form C26-5774-0)

Jon

OK, since the mysterious "Steve" who actually HAS a 1620 
apparently can't be contacted, anybody else have a 1620, or 
know somebody who does?  Or, has a significant collection

of 1620 items?

These manuals, or newer editions, are already on bitsavers, 
so there's nothing new there.


Otherwise they go to the person who contacted me first on 
5/13. (I'm just seeing if there's anybody who actually NEEDS 
these before giving them to somebody who just "wants" them.)


 Jon

Re: IBM 1620 manuals

[Dave Babcock via cctalk]

Jon,

The Computer History Museum (Mountain View, California) has the most 
extensive collection of IBM 1620 items - hardware, manuals, books, 
software, etc. - in the world.  Most of the items were collected a 
number of years ago when a team of volunteers restored the museum's IBM 
1620 Model 1 Level F computer to full operation.


I verified that the museum has both of these physical manuals, plus some 
associated update notices.  So, the museum does not need them.  Thanks 
for offering.


A subset of the restoration team is currently building a historic 
replica of the machine - dubbed the IBM 1620 Jr. - for the museum's 
education department use.  We've exhibited it at VCF West the past 2 
years [winning Best in Show last year] and will be there again this 
year.  This year we will be highlighting our work to create a 
general-purpose, ASCII terminal using an IBM/Lexmark Wheelwriter 1000 
typewriter.


Thanks,
Dave


On 5/25/2019 11:35 AM, Jon Elson via cctalk wrote:

On 05/13/2019 10:57 PM, Jon Elson via cctalk wrote:
I just discovered a binder with 2 IBM 1620 manuals.  A quick check 
shows bitsavers has these and newer editions of them.


So, does anybody want :

IBM 1620 Central Processing Unit, Model 2  (Form A26-5781-1)

and

IBM 1620 Monitor II System Reference Manual (Form C26-5774-0)

Jon

OK, since the mysterious "Steve" who actually HAS a 1620 apparently 
can't be contacted, anybody else have a 1620, or know somebody who 
does?  Or, has a significant collection

of 1620 items?

These manuals, or newer editions, are already on bitsavers, so there's 
nothing new there.


Otherwise they go to the person who contacted me first on 5/13. (I'm 
just seeing if there's anybody who actually NEEDS these before giving 
them to somebody who just "wants" them.)


 Jon

Re: TU58FS

[Jay Jaeger via cctalk]

On 5/23/2019 10:07 PM, Rod Smallwood via cctalk wrote:
> Hi
> 
>     It does not have to be done using TU58.
> 
> If you would be so kind as to explain the bit about SIMH and dd.
> 
> What to do is good.. How even better.
> 
> If I can get  a bootable OS image onto the SCSI drive with what I have
> available then that's all I  need.
> 
> Rod Smallwood
> 

The idea would be to use another machine (say, a PC running Linux) to
copy an image that runs under SimH configured for the same disk
controller and geometry to copy that image to the disk.

Re: M7264 Troubleshooting

[Mister PDP via cctalk]

Ok, small update. My M8043 (DLV11-J) just arrived today. It seemed in good
condition so I confirmed it was set up correctly (9.6k baud and console on
J3), built a serial cable from the information provided on gunkies, and put
it into my system. Sadly, it behaves exactly how it did with the M8017. No
output, no activity on the BRPLY line. I have a hard time imagining that
both my M8017 and my M8043 are bad, but it could still be possible.

On Thu, May 23, 2019 at 7:38 AM Mattis Lind via cctalk <
cctalk@classiccmp.org> wrote:

> Den tors 23 maj 2019 kl 14:14 skrev Noel Chiappa via cctalk <
> cctalk@classiccmp.org>:
>
> > > From: Jon Elson
> >
> > > Yes, this is most likely a bus timeout
> >
> > The good news is that it looks like his CPU is 'mostly' working; and if
> > the NXM is due to a fault on the CPU (e.g. bad bus transceiver sending
> > the wrong address), that would be fixable (it uses 8641's).
> >
> > If the fault is in the DLV11-E (and not just misconfiguration), depending
> > on
> > where the fault is, he might be out of luck with that card; it uses
> DC005's
> > for transceivers, which of course are unobtainium now.
>
>
> Not really unobtainium: https://www.ebay.com/itm/281679682476 and
> https://www.ebay.com/itm/253305313497
>
> These DC0xx chips can sometimes be found on Ebay under their Signetics
> name.
>
> DC003 C2293N
> DC004 C2301N
> DC005 C2324N
> DC006 C2345N
> DC010 C2344N
>
>
>
>
> > Still, QBUS serial
> > interfaces are not rare.
> >
> > And overall, progress is being made! :-)
> >
> > Noel
> >
>
> /Mattis
>