[cctalk] HP Computer Museum update

[David Collins via cctalk]

Those who have an interest in vintage HP computing will most likely know of
the HP Computer Museum (www.hpmuseum.net). The HP Computer Museum is the
result of over 30 years of work by Jon Johnston who collected HP equipment
and documentation and systematically catalogued, photographed and commented
on almost all of the over 7,000 items in the collection. 

After Jon's death in 2016, I kept the museum website going and worked on
restoring many of the more notable items in the collection to working order,
but the museum has largely been static for the last six years. 

Jon's wish was that the collection would eventually find its way either to
HP or to one of the major computer museums, and I'm pleased to advise that
the Hewlett Packard Company Archives (HPCA) has agreed to take over the
entire collection and website.

With only a few exceptions, the museum's entire collection of HP hardware,
software and manuals has now been shipped from Melbourne, Australia, to
HPCA's archival company - Heritage Werks Inc, in Atlanta, Georgia, USA.  The
equipment will be catalogued and preserved as a record of HP's early years
in computing, with the ability for HP offices to borrow equipment for
display purposes.  

The HP Computer Museum website (www.hpmuseum.net 
), which has long been a popular reference resource for enthusiasts and
industry on HP's computing history, will continue and be maintained by the
HPCA, through Heritage Werks, with the intent of ensuring ongoing access to
the wealth of information collected by Jon and many other HP enthusiasts
over the last 30 years.  
Over the coming weeks and months, the website will be relocated to new
hosting platforms and the curatorship will transfer to Heritage Werks.  

This will bring to a close my role in maintaining Jon's legacy in HP
computing.  It's been a privilege to be responsible for the collection and
the website and to see the value they bring to the vintage computing
community.  

David Collins

Re: interesting... hp-9000 in the news! - russian-hackers-used-backdoor-two-decades

[David Collins via cctalk]

It's an HP9000 E55. The HP Computer Museum even has one in our collection!

David Collins
Curator
www.hpmusuem.net

David Collins
Client Engagement Manager
Dimension Data
Tel: +61 3 9626 0593
Mob: +61 424 785 131
e-mail: david.coll...@dimensiondata.com 

(Sent from out of office)

On 4 Apr 2017, at 9:23 am, Cameron Kaiser via cctalk  
wrote:

>> interesting... hp-9000 in the news!  -  
>> russian-hackers-used-backdoor-two-decades
> 
> I'm trying to identify the specific unit. It looks like an early PA-RISC,
> but even the enlargement doesn't show the model number clearly.
> 
>> https://www.wired.com/2017/04/russian-hackers-used-backdoor-two-decades/
> 
> -- 
>  personal: http://www.cameronkaiser.com/ 
> --
>  Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckai...@floodgap.com
> -- Please dispose of this message in the usual manner. -- Mission: Impossible 
> -

Re: interesting... hp-9000 in the news! - russian-hackers-used-backdoor-two-decades

[David Collins via cctalk]

I clicked on the image in the report and it opened up a high def file which I 
could zoom in on.  For some reason it won't do it now but I snipped the HP 9000 
E55 badge image as a record. Not sure how to post it here.  The terminal badge 
says it's a 700/96 terminal. 

It wasn't a guess!

David Collins


On 4 Apr 2017, at 2:47 pm, Cameron Kaiser via cctalk  
wrote:

>> It's an HP9000 E55. The HP Computer Museum even has one in our collection!
> 
> Interesting. I guess it could be any of the E-class, though: OpenPA has a
> picture of an E35 that looks like a slightly closer match. I'm surprised
> it's recent enough to have a PA-7100; I would have agreed with Zane that it
> was an earlier type system.
> 
> http://www.openpa.net/systems/hp-9000_e25_e35_e45_e55.html
> 
> -- 
>  personal: http://www.cameronkaiser.com/ 
> --
>  Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckai...@floodgap.com
> -- Use [Microsoft] IE and Passport and you can browse like it's 1984. -- /. 
> ---

Re: interesting... hp-9000 in the news! - russian-hackers-used-backdoor-two-decades

[David Collins via cctalk]

Try opening the following link in Chrome (not IE). 

https://www.wired.com/wp-content/uploads/2017/04/DSC_0794.jpg

That opened the full image for me. 

David Collins

On 4 Apr 2017, at 2:47 pm, Cameron Kaiser via cctalk  
wrote:

>> It's an HP9000 E55. The HP Computer Museum even has one in our collection!
> 
> Interesting. I guess it could be any of the E-class, though: OpenPA has a
> picture of an E35 that looks like a slightly closer match. I'm surprised
> it's recent enough to have a PA-7100; I would have agreed with Zane that it
> was an earlier type system.
> 
> http://www.openpa.net/systems/hp-9000_e25_e35_e45_e55.html
> 
> -- 
>  personal: http://www.cameronkaiser.com/ 
> --
>  Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckai...@floodgap.com
> -- Use [Microsoft] IE and Passport and you can browse like it's 1984. -- /. 
> ---

RE: HP 9836 systems and Fuji Pictrography 4000 printer available

[David Collins via cctalk]

Marc, I'm scrapping a 9826 right now as part of a clean-up of the HP Computer 
Museum and have a keyboard (or specific keycaps) and power switch available for 
the cost of shipping.  If you have any specific IO boards you are after I might 
have some of those spare as well. 

Let me know. 

David Collins
HP Computer Museum

-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Curious Marc 
via cctalk
Sent: Sunday, 28 May 2017 7:04 AM
To: Bob Rosenbloom ; cctalk@classiccmp.org
Subject: Re: HP 9836 systems and Fuji Pictrography 4000 printer available

Bob,

I might not take the whole machines, but I could use parts. I am missing a few 
key caps/switches and a power switch on mine (the three of them which come... 
from you!). And extra IO boards are always welcome. Before you scrap 
everything, let me know if I can come on Sunday.

Marc

 

 

From: cctalk  on behalf of 
"cctalk@classiccmp.org" 
Reply-To: Bob Rosenbloom , "cctalk@classiccmp.org" 

Date: Saturday, May 27, 2017 at 1:51 PM
To: Tony Duell , "cctalk@classiccmp.org" 

Subject: Re: HP 9836 systems and Fuji Pictrography 4000 printer available

 

On 5/26/2017 12:50 PM, Tony Duell wrote:

On Fri, May 26, 2017 at 8:45 PM, Bob Rosenbloom via cctalk

 wrote:

Spring cleaning time!

 

I have three vintage HP 9836 computers, two monochrome monitors, one color

monitor and three printers.

I'm sure they are going to need work to get running. No testing has been

done. Could probably get two out

of the three working. Somewhere I have a few various I/O cards also that

will be included.

The video boards (in the main unit, under the left disk drive) are different

between mono and colour versions of the 9836. You can't use a colour

monitor on a monochrome machine or vice versa. So if somebody

ends up taking 1 or 2 machines, make sure you get the right monitors.

 

An easy way to tell them apart without dismantling is that the colour

machine has a thumbwheel (contrast control) on the bottom.. Left

side, about level with the front of the drives. The mono machine

doesn't. The mono motor has a knob on the back, the colour

monitor has an IEC mains connector.

 

-tony

 

 

I looked at the three machines. Two are monochrome and the third has a 

sticker saying it's been upgraded to

an 9836C so that's the one for the color monitor.

 

Unfortunately, it looks like no one is interested in them so they might 

get scrapped. Oh well... I just don't have

room to keep everything.

 

Bob

 

 

-- 

Vintage computers and electronics

www.dvq.com

www.tekmuseum.com

www.decmuseum.org

 

 

RE: HP 9836 systems and Fuji Pictrography 4000 printer available

[David Collins via cctalk]

Paul, the key switches look very much like this but on my unit the plastic stem 
is black.  The cross piece etc looks to be the same. 

http://i.imgur.com/M8oFv0K.jpg




-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Paul Berger 
via cctalk
Sent: Sunday, 28 May 2017 11:20 AM
To: David Collins via cctalk 
Subject: Re: HP 9836 systems and Fuji Pictrography 4000 printer available

David,


Do you know if the key switches used in these keyboards are the same as 
the one in the Nimitz keyboard?I  have a two switches with broken 
stems, that I have glued for now but it would be nice to get replacement and a 
few spares.

Paul.



On 2017-05-27 9:45 PM, David Collins via cctalk wrote:
> Marc, I'm scrapping a 9826 right now as part of a clean-up of the HP Computer 
> Museum and have a keyboard (or specific keycaps) and power switch available 
> for the cost of shipping.  If you have any specific IO boards you are after I 
> might have some of those spare as well.
>
> Let me know.
>
> David Collins
> HP Computer Museum
>
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of 
> Curious Marc via cctalk
> Sent: Sunday, 28 May 2017 7:04 AM
> To: Bob Rosenbloom ; cctalk@classiccmp.org
> Subject: Re: HP 9836 systems and Fuji Pictrography 4000 printer 
> available
>
> Bob,
>
> I might not take the whole machines, but I could use parts. I am missing a 
> few key caps/switches and a power switch on mine (the three of them which 
> come... from you!). And extra IO boards are always welcome. Before you scrap 
> everything, let me know if I can come on Sunday.
>
> Marc
>
>   
>
>   
>
> From: cctalk  on behalf of 
> "cctalk@classiccmp.org" 
> Reply-To: Bob Rosenbloom , 
> "cctalk@classiccmp.org" 
> Date: Saturday, May 27, 2017 at 1:51 PM
> To: Tony Duell , "cctalk@classiccmp.org" 
> 
> Subject: Re: HP 9836 systems and Fuji Pictrography 4000 printer 
> available
>
>   
>
> On 5/26/2017 12:50 PM, Tony Duell wrote:
>
> On Fri, May 26, 2017 at 8:45 PM, Bob Rosenbloom via cctalk
>
>  wrote:
>
> Spring cleaning time!
>
>   
>
> I have three vintage HP 9836 computers, two monochrome monitors, one 
> color
>
> monitor and three printers.
>
> I'm sure they are going to need work to get running. No testing has 
> been
>
> done. Could probably get two out
>
> of the three working. Somewhere I have a few various I/O cards also 
> that
>
> will be included.
>
> The video boards (in the main unit, under the left disk drive) are 
> different
>
> between mono and colour versions of the 9836. You can't use a colour
>
> monitor on a monochrome machine or vice versa. So if somebody
>
> ends up taking 1 or 2 machines, make sure you get the right monitors.
>
>   
>
> An easy way to tell them apart without dismantling is that the colour
>
> machine has a thumbwheel (contrast control) on the bottom.. Left
>
> side, about level with the front of the drives. The mono machine
>
> doesn't. The mono motor has a knob on the back, the colour
>
> monitor has an IEC mains connector.
>
>   
>
> -tony
>
>   
>
>   
>
> I looked at the three machines. Two are monochrome and the third has a
>
> sticker saying it's been upgraded to
>
> an 9836C so that's the one for the color monitor.
>
>   
>
> Unfortunately, it looks like no one is interested in them so they 
> might
>
> get scrapped. Oh well... I just don't have
>
> room to keep everything.
>
>   
>
> Bob
>
>   
>
>   
>

Re: HP9816 keyboard plunger wanted.

[David Collins via cctalk]

Mattis, the problem you have is very common on these and HP85 keyboards and is 
usually caused by one side of the square plunger cracking in a corner and 
bowing out. 

It's normally fixed by gently bending the affected side towards the centre of 
the square. A little bit of heat from a hair dryer while bending helps it stay 
in place. Be careful when you reinsert the keycap so you don't bend it out 
again. 

Although it's not really recommended as it can attract dust, I also give the 
plunger a squirt of silicone or WD40 to keep it moving smoothly. 

Hope that helps. 

David Collins
HP Computer Museum

> On 29 May 2017, at 1:50 am, Mattis Lind via cctalk  
> wrote:
> 
> Hello!
> 
> I recently received a HP9816 machine. The previous owner originally got the
> machine without a keyboard but subsequently sourced a keyboard off ebay.
> 
> Unfortunately this keyboard was not in the best shape. One key was stuck
> and when taking it apart it was evident that it has taken a bath for quite
> some time. At least the electronics around the space bar were quite
> affected with corrosion. Luckily this keyboard is quite simple design with
> only CMOS 4XXX IC, and better yet, Tony Duell has already reverse
> engineered it (together with the rest of this little machine). Thanks a lot
> Tony!
> 
> But the stuck key appeared to be cause by the "plunger" (is that the
> correct english word?) is slightly cracked in the corner. When the keytop
> is inserted it is not sliding very well.
> 
> I have not found a method of repairing it so I am asking the community if
> there are anyone that has spare "plungers" for the HP9816 keyboard.
> 
> http://i.imgur.com/q5aRQnC.jpg?1
> http://i.imgur.com/67xWZ8q.jpg?1
> http://i.imgur.com/cGWCKFw.jpg?1
> 
> 
> This is the keyboard at the hpmuseum.net page:
> http://www.hpmuseum.net/images/200serieskeyboardsmall-35.jpg
> 
> /Mattis

Re: RL02 Replacement indicator bulbs

[David Collins via cctalk]

Try 1000bulbs.com

David Collins

(Sent from out of office)

> On 17 Jun 2017, at 7:14 pm, Aaron Jackson via cctalk  
> wrote:
> 
> Hi everyone,
> 
> Can anyone suggest a source of replacement indicator bulbs for an RL02
> drive? Are they fairly standard?
> 
> I found this eBay listing, 14v, similar looking bulb:
> 
> http://www.ebay.co.uk/itm//152525108621
> 
> Do we think they will work? Just looking for some confirmation before I
> buy a bunch of bulbs I might not be able to use.
> 
> Thanks,
> 
> Aaron.
> 
> 
> --
> Aaron Jackson
> PhD Student, Computer Vision Laboratory, Uni of Nottingham
> http://aaronsplace.co.uk/

RE: HP 12653A line printer interface

[David Collins via cctalk]

I've looked for this card in the HP Computer Museum collection - no luck so
far. 

-Original Message-
From: cctech [mailto:cctech-boun...@classiccmp.org] On Behalf Of J. David
Bryan via cctech
Sent: Wednesday, 12 July 2017 4:12 AM
To: CuriousMarc 
Cc: Classic Computing List 
Subject: Re: HP 12653A line printer interface

Marc,


On Monday, July 10, 2017 at 22:24, CuriousMarc wrote:

> I thought I did, but what I have is the HP 12845B Line Printer 
> interface card, for which I could find the documentation.

Thanks for checking.  Yes, that does seem to be the more common card.  As
far as I know, the 12653A was used only for the HP 2767 (a rebranded Data
Products 2310), whereas the 12845B was used for a number of other HP
printers.


> Reading some more, it is meant for the 2607/261x series of printers, 
> which apparently use a narrower 7 bit interface (the 12566 is a 16 bit 
> interface card).

Which is all a bit odd, as the 2767 also uses 7 bits for data.  Unlike the
other printers that use differential interfaces, the 2767 uses single-ended
TTL-level (more or less) drivers and receivers, which may explain the use of
the microcircuit-based interface.

The 2767 signal drivers are adjustable for a 3- to 8-volt output level, so
perhaps the 12635A "modification" was to clip the inputs to avoid damaging
the standard microcircuit receivers (7400 TTL with an absolute maximum input
spec of 5.5 V).  In the absence of a manual, I was hoping that a photograph
would reveal the modification.


> But maybe you can inspire yourself from it.

The existing 2767/12653 simulation was reverse-engineered from the
diagnostic and OS drivers.  Although it works, I was hoping for something
more authoritative so that the code could serve as a reference for the
now-extinct hardware.

  -- Dave

Re: HP 12653A line printer interface

[David Collins via cctalk]

I do indeed have the printer. Found it on the weekend. No sign of the interface 
card or cable yet though. 

David Collins

(Sent from out of office)

> On 14 Jul 2017, at 6:02 pm, CuriousMarc via cctalk  
> wrote:
> 
> Ah, thanks, I learned something. The HP 2767 is a weird beast - line drum
> printer but only 80 columns, from what I glean from hpmuseum.net. David
> (Collins), do you have the printer?
> Marc
> 
> -Original Message-
> From: J. David Bryan [mailto:jdbr...@acm.org] 
> Sent: Tuesday, July 11, 2017 11:12 AM
> To: CuriousMarc
> Cc: Classic Computing List
> Subject: Re: HP 12653A line printer interface
> 
> Marc,
> 
> 
>> On Monday, July 10, 2017 at 22:24, CuriousMarc wrote:
>> 
>> I thought I did, but what I have is the HP 12845B Line Printer 
>> interface card, for which I could find the documentation.
> 
> Thanks for checking.  Yes, that does seem to be the more common card.  As
> far as I know, the 12653A was used only for the HP 2767 (a rebranded Data
> Products 2310), whereas the 12845B was used for a number of other HP
> printers.
> 
> 
>> Reading some more, it is meant for the 2607/261x series of printers, 
>> which apparently use a narrower 7 bit interface (the 12566 is a 16 bit 
>> interface card).
> 
> Which is all a bit odd, as the 2767 also uses 7 bits for data.  Unlike the
> other printers that use differential interfaces, the 2767 uses single-ended
> TTL-level (more or less) drivers and receivers, which may explain the use of
> the microcircuit-based interface.
> 
> The 2767 signal drivers are adjustable for a 3- to 8-volt output level, so
> perhaps the 12635A "modification" was to clip the inputs to avoid damaging
> the standard microcircuit receivers (7400 TTL with an absolute maximum input
> spec of 5.5 V).  In the absence of a manual, I was hoping that a photograph
> would reveal the modification.
> 
> 
>> But maybe you can inspire yourself from it.
> 
> The existing 2767/12653 simulation was reverse-engineered from the
> diagnostic and OS drivers.  Although it works, I was hoping for something
> more authoritative so that the code could serve as a reference for the
> now-extinct hardware.
> 
> -- Dave
> 
> 

RE: HP 12653A line printer interface

[David Collins via cctalk]

Unfortunately, there are none of the big impact printers in the collection.  In 
my days as an HP Customer Engineer I worked on the 2613 and 2617 drum printers 
and the 2611 and 2619 chain printers.   I don’t recall ever working on a 2618.  
Those drums and chains would be covered in caked on ink and paper dust – as 
were my hands after working on them…

 

The only full width data centre grade impact printers the museum has that I am 
currently aware of are the 2767, a 2608A and a 2563A – but there may be some 
more judging by some of the photos I can see in the museum’s records. 

 

From: Curious Marc [mailto:curiousma...@gmail.com] 
Sent: Tuesday, 18 July 2017 5:13 PM
To: David Collins ; General Discussion: On-Topic and 
Off-Topic Posts 
Cc: J. David Bryan ; Classic Computing List 

Subject: Re: HP 12653A line printer interface

 

Cool. Thanks for looking. Do you guys also have some of the full 132 column 
ones? In particular the HP2618A or related, 1200 lpm impact chain/train 
technology: http://www.hpmuseum.net/display_item.php?hw=331 . I just acquired a 
1200 lpm Memorex that looks like it is a rebadged Dataproducts with an IBM buss 
and tag interface added. I am wondering if it is based off the same 
mechanism/interface that was used in the HP2618A or its high end HP relatives 
of the time. Your web site says the HP2618A was made by Dataproducts, so that 
has me all intrigued. 

Marc

 

From: David Collins
Date: Sunday, July 16, 2017 at 4:54 PM
Subject: Re: HP 12653A line printer interface

 

I do indeed have the printer. Found it on the weekend. No sign of the interface 
card or cable yet though. 

David Collins

 

On 14 Jul 2017, at 6:02 pm, CuriousMarc via cctalk mailto:cctalk@classiccmp.org> > wrote:

Ah, thanks, I learned something. The HP 2767 is a weird beast - line drum

printer but only 80 columns, from what I glean from hpmuseum.net. David

(Collins), do you have the printer?

Marc

 

 

Re: VCF?

[David Collins via cctalk]

Its going well.  Alto presentation about to start..

David Collins
HP Computer Museum

Sent from my iPad

> On 6 Aug 2017, at 11:26 am, Fred Cisin via cctalk  
> wrote:
> 
> How is VCF going?
> 
> 
> I was going to take a dozen boxes of books, a couple of computers, and some 
> miscellaneous.
> My health got in the way.
> I'm getting prostate surgery (ANOTHER TURP) on Thursday,
> I just don't feel up to packing loading, or even driving an hour each way.
> 
> 
> --
> Grumpy Ol' Fred ci...@xenosoft.com

RE: DCC-116 E / DATA GENERAL NOVA 2/10 / Nixdorf 620 - Restoring and restarting

[David Collins via cctalk]

An easy way to check the caps is to see what the voltage across them is like
when you put the system under load and the 'regulated' voltage drops.  If
the cap voltage drops substantially, or if you get a high ripple under load,
that's a good sign the caps are bad.

You mention that the +5V holds up with just the CPU and 3 memory boards and
then drops as you add more.  The CPU and memory boards should pull a fair
amount of power on their own so it seems strange the 5V isn't off to some
degree with just those boards.  Have you tried just those additional boards
without the CPU and memory boards to see if they may have bad components on
them that are loading the 5V rail?  Bad decoupling capacitors on boards can
short out/load up the supply rails and cause the problem you are seeing.  

David Collins

-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Dominique
Carlier via cctalk
Sent: Saturday, 19 August 2017 6:17 PM
To: Curious Marc ; General Discussion: On-Topic and
Off-Topic Posts 
Subject: Re: DCC-116 E / DATA GENERAL NOVA 2/10 / Nixdorf 620 - Restoring
and restarting

Hello Marc,

In fact no, i am not really sure, I checked twice all the big filtering caps
but as you with a low voltage tester. These caps comes apparently from a new
old stock and some doubts persists now.
I admit, I don't know how to test these caps at rated voltage with my tools
or in situ with the caps inside the working (and thus
closed/packed/connected) PSUs

Dominique

On 19/08/2017 07:11, Curious Marc wrote:
> Great work, you have isolated the supply fault. Looks like it's not
regulating, but the fact that it starts at 5V tells me it actually is, at
low current drain. Are you *really really* sure the filtering caps are good
*at rated voltage* (we had a recent case of caps that tested perfect with my
low voltage tester but were duds at their rated voltage)? Bad caps would
cause something like this. If not I'd usually start to check the regulating
power transistors. Could be anything else of course, having the schematics
would allow for a much more intelligent conversation instead of blind
speculation.
> Marc
>
> On Aug 18, 2017, at 10:25 AM, Dominique Carlier via cctalk
 wrote:
>
> Some news !
>
> Following a risky way (but I did not see how to do otherwise), I
deactivated the Power Fail by hiding the contact number 23 of the two power
supplies.
> The idea was to avoid automatic protection by lowering the regulated
voltages (+5V and 15V) and see first which unit was involved (G1 or G2), and
also which voltages became weak, at what level it is lowered, and according
to which board (model or number of connected boards).
>
> Results of the observations:
> - This is definitely the regulated +5V of the G2 power supply. More I add
boards more the + 5v level goes down. +5v, +4.8v, +3.6v, +2.9v. It remains
stable however with just the CPU and the three core memory boards, it
becomes difficult for the power supply when I add boards in addition to
these.
> - This is definitely not a problem at the level of the Power Fail circuit.
> - The big capacitors are not in fault (I rechecked twice).
> - So this maybe a problem at the level of the regulation itself, the +5V
balancing system ?
>
> Question: a faulty voltage regulator can behave in this way? I always
thought it worked or it did not work, but not between the two states
depending on the charge.
>
> Anyway, suggestions are always welcome ;-)
>
> PS : I'm starting to want to put another power supply for that regulated
+5V, and bypass the +5V regulated of G2, but it would be a shame and not in
the spirit of a restoration in my opinion.
>
>
>
>
>  Forwarded Message 
> Subject:Re: DCC-116 E / DATA GENERAL NOVA 2/10 / Nixdorf 620 -
Restoring and restarting
> Date:Wed, 16 Aug 2017 23:33:31 +0200
> From:Dominique Carlier 
> To:Christian Kennedy via cctalk 
>
>
>
> Hi !
>
> I finally find some time to work again on my D-116, try to find the 
> problem(s), thus principally at the level of PSUs.
> As you suggested, I inspected particularly the large capacitors of 
> both power supplies. I replaced those that appeared suspicious 
> according to the results via my ESR meter, but note that this one is 
> not supposed to be able to verify the capacitors of more than 22000μF. 
> I have also some doubt about the results (capacitor working with a real
charge or not).
>
> Anyway, unfortunately the problem is still there. I don't know where 
> to search now. If I understand well, the two power supplies can cause 
> a Power Fail if one of the regulated voltages were out of range. At 
> this point I do not know which of the two is in fault, because when 
> the Power Fail is active the + 5V is automatically dropped around 1.5V.
> Following the schematics I have focused my attention on the value of 
> some resistors with an important role in triggering this state (eg R18).
> I found nothing abnormal, I checked all the capacitors, a large 
> pa

Re: HP 7970B Capstan?

[David Collins via cctalk]

From my old HP CE days you could always get black off the capstan if you used 
alcohol or similar (never recommended). The key thing is it shouldn't be 
sticky/gooey. 

The official cleaning solution when they were in active use was water and a low 
lint cloth. 

David Collins

(Sent from out of office)

> On 6 Sep 2017, at 3:18 pm, CuriousMarc via cctalk  
> wrote:
> 
> All my capstans are feel rather hard (I think because the rubber is pretty 
> thin), and do not feel sticky either. The finish is matte. But they are not 
> powdery at all, they would not leave any residue rubbing your finger on them, 
> so something looks odd with yours. When the tape is threaded but the power is 
> off, they grab the tape well enough that turning the bottom reel by hand will 
> move the capstan easily, without any slippage. 
> Marc
> 
> -Original Message-
> From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Chuck Guzis 
> via cctalk
> Sent: Monday, September 04, 2017 9:17 PM
> To: CCtalk
> Subject: HP 7970B Capstan?
> 
> I've got an HP 7970 tape drive here that's a little dicey on its reading 
> (haven't tried writing yet).  One thing that I noticed today was that the 
> surface of the capstan is a bit powdery--wipe it with an alcohol swab and you 
> get a lot of black schmutz.
> 
> It wasn't very soft and it occurred to me that it might be slipping, so I 
> cleaned it off and treated it with some methyl salicylate (oil of 
> wintergreen).  It's a bit softer now, but I'm wondering, for those of you who 
> still have functioning drives, how soft or "sticky/grippy" is right.
> 
> Any ideas?
> 
> Thanks,
> Chuck
> 
> 
> 

RE: Looking for firmware of HP82937 & HP82939

[David Collins via cctalk]

If no-one else has, I should be able to...

David Collins
HP Computer Museum

-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of F.Ulivi via 
cctalk
Sent: Friday, 22 September 2017 10:35 PM
To: cctalk@classiccmp.org
Subject: Looking for firmware of HP82937 & HP82939

Hi everyone,

does anyone of you happen to know if the i8049 MCUs inside HP85 expansion 
modules 82937 (HPIB) & 82939 (RS232) have ever been dumped?
The HP part numbers for these masked ROM devices should be 1820-2437 and 
1820-2438, respectively.
I'm asking because I'm working on the MAME emulation of HP85 and I'm about to 
begin implementing these modules (especially the 1st, so that
HP9895 disk drive can be interfaced).

Thank you very much.

-- F.Ulivi

Re: (Classic Computers) HP 7970 1/2" 9-Track Reel-to-Reel Tape Drive

[David Collins via cctalk]

Al, while I can’t rescan the thousands of documents already in the HP Computer 
Museum’s website and leave off the Australia stamp, I can assure you any future 
documents will be scanned as originally printed. 

I am in the process of sifting through many pallets of old duplicate HP manuals 
that were in storage as part of a cleanup and will put any items that were 
missed up on the site over time. 

You are of course welcome to include any of those on your site so there are 
multiple sources for these rare documents in the future.

David Collins
Curator
HP Computer Museum
Australia


> On 5 Oct 2017, at 4:06 am, Al Kossow via cctalk  wrote:
> 
> 
> 
>> On 10/3/17 7:24 PM, Chuck Guzis via cctalk wrote:
>> Al has a bunch of 7970 stuff on bitsavers, but not, I think (I
>> could be wrong) the manual specific to the B and C models.
> 
> I still have several tubs of HP manuals that I haven't gone through and
> I remember there were several revisions for the drive. At the time, I
> scanned the later versions.
> 
> Unfortunately, the Australians defaced every scan they made, so I will
> never include anything from them on bitsavers.
> 
> 
> 

Re: (Classic Computers) HP 7970 1/2" 9-Track Reel-to-Reel Tape Drive

[David Collins via cctalk]

Jay, if you have any scanned HP manuals that you don’t think are on line, I’d 
be happy to post them up on the HP Computer Museum site, giving credit where 
it’s due of course!

David Collins


> On 5 Oct 2017, at 8:10 am, Chuck Guzis via cctalk  
> wrote:
> 
>> On 10/04/2017 12:17 PM, Jay West via cctalk wrote:
>>> On 10/3/17 7:24 PM, Chuck Guzis via cctalk wrote:
>>> Al has a bunch of 7970 stuff on bitsavers, but not, I think (I could 
>>> be wrong) the manual specific to the B and C models.
>> 
>> I do have a chunk of HP service manuals (pretty sure 7970 included) that are 
>> in electronic format but have never made it online. If it needed, let me 
>> know what you're looking for.
> 
> Much appreciate, Jay.  I think I have what I need for time being.
> 
> --Chuck
> 

RE: HP-UX 5.1 for the 9836U?

[David Collins via cctalk]

If someone ends up finding it, I'd be happy to host it on the HP Computer
Museum website. 

David Collins


-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Rik Bos via
cctalk
Sent: Sunday, 15 October 2017 7:30 PM
To: Curious Marc 
Cc: General Discussion: On-Topic and Off-Topic Posts 
Subject: Re: HP-UX 5.1 for the 9836U?

Marc,




The different is in the processor board. The 9836A/C are using a 68000 the
9836U uses a 68010 processor.





-Rik




Van: Curious Marc via cctalk


Verstuurd: zondag 15 oktober 05:41


Onderwerp: Re: HP-UX 5.1 for the 9836U?


Aan: Josh Dersch, General Discussion: On-Topic and Off-Topic Posts






Josh, Sorry don't have it, but I didn't even know there was a 9836 that ran
Unix, so I learned something again. Does it look like a regular 9836C or is
it a different form factor? Marc On Oct 14, 2017, at 3:25 PM, Josh Dersch
via cctalk wrote: Hi all -- Anyone have media for the 9836U version of HP-UX
5.1? The copy on hpmuseum.net
(http://www.hpmuseum.net/display_item.php?sw=581) only works on the 9000/310
and I haven't found much of anything anywhere else. Thanks as always, Josh 

Re: HPGL plotter art files

[David Collins via cctalk]

Brent could you send it to cura...@hpmuseum.net as well?

Thanks!

David Collins

> On 16 Oct 2017, at 2:32 pm, Brent Hilpert via cctalk  
> wrote:
> 
>> On 2017-Oct-15, at 4:20 PM, Mike Stein via cctalk wrote:
>> Can anybody direct me to some interesting HPGL plotter files for a display 
>> at the upcoming World of Commodore show?
> 
> 
> I'm sending (in a separate, direct message with attachment) the semi-famous / 
> once ubiquitous Space Shuttle plot from the 1980s.
> 
> I received it from someone after making a similar request to the list 10 
> years ago.
> 
> Some things to note though: this plot uses multiple colored pens and was 
> scaled to some (largish, IIRC) size of paper.
> I was targetting a HP 9872 plotter which was too early to understand some of 
> the more complex HPGL directives present in the SS plot, such as drawing arcs.
> I wrote a language filter/converter that will optionally scale the image, 
> offset it relative to the plotter bed, converts certain directives e.g. arcs 
> to a series of line-segment directives, reduces the number of pens, etc.
> 
> I'll send the original SS plot, if you figure you could use the filter 
> program, I can send it along, or a modified plot, upon request.
> 

Re: HP 7970 1/2" 9-Track Reel-to-Reel Tape Drive...

[David Collins via cctalk]

Pretty expensive to ship one from Australia I guess...

David Collins


> On 18 Oct 2017, at 6:34 am, Jack Harper via cctalk  
> wrote:
> 
> 
> Greetings to the List -
> 
> Does anyone know of a HP 7970 (any model) tape drive that might be 
> available
> 
> Any leads appreciated.
> 
> Regards from the Rocky Mountains -
> 
> Jack
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> --
> Jack Harper, President
> Secure Outcomes Inc
> 2942 Evergreen Parkway, Suite 300
> Evergreen, Colorado 80439 USA
> 
> 303.670.8375
> 303.670.3750 (fax)
> 
> http://www.secureoutcomes.net for Product Info. 

Re: Tubbs fire consumed the collected archives of William Hewlett and David Packard

[David Collins via cctalk]

Completely agree. I’m in the process of scanning additional product manuals 
that haven’t made it into the HP Computer Museum’s site yet. 

Any of us with websites could have some reason to stop doing this good work at 
any time so duplicated info across a few sites is an important risk reduction 
item!

David Collins
HP Computer Museum

> On 30 Oct 2017, at 8:43 am, Ed via cctalk  wrote:
> 
> 
> The Tubbs fire  consumed the collected archives of William Hewlett and 
> David Packard, the tech  pioneers who in 1938 formed an electronics company 
> in a 
> Palo Alto garage with  $538 in cash. 
> More  than 100 boxes of the two men’s writings, correspondence, speeches 
> and other  items were contained in one of two modular buildings that burned 
> to 
> the ground  at the Fountaingrove headquarters of Keysight Technologies. 
> Keysight, the  world’s largest electronics measurement company, traces its 
> roots to HP and  acquired the archives in 2014 when its business was split 
> from 
> Agilent  Technologies — itself an HP spinoff. 
> 
> http://bit.ly/2yd6Z2G 
> (My added note)   And this is  why I continue to stress  multiple 
> caches of  copies/scans of historical material... and sad... as in this  case 
> here is  someone that  could have footed the bill and not missed the  money 
> to  
> do it.  
> Ed#  Archivist  for SMECC

Re: HP 2640 character set generation manual in the UK

[David Collins via cctalk]

Already checked, not one we have unfortunately. If one turns up we’ll be happy 
to put it up on the website though!

David Collins
HP Computer Museum

Sent from my iPad

> On 4 Nov 2017, at 7:17 am, Ed via cctalk  wrote:
> 
> no the  other  hp museum!
> across the pond!
> http://hpmuseum.net/
> 
> good people!
> 
> 
> it may already be online  they have  done a  good   job  scanning  stuff.
> 
> ed#
> 
> 
> In a message dated 11/3/2017 12:30:36 P.M. US Mountain Standard Time,  
> cctalk@classiccmp.org writes:
> 
>>> Well they say they would like to scan but no resource. Available to  
>>> view on three days notice
>> On Fri, 3 Nov 2017, Ed via cctalk  wrote:
>> 
>> what  about the  kind  folks at the hp  museum?
> 
> . . . and' don't they have some sort of archive in Santa  Rosa?
> 
> 
> 
> 
> 

Re: RL02 Spinup fails

[David Collins via cctalk]

I’m more used to working on HP drives of this type but it sounds to me like you 
are getting a seek Time Out. It sounds like the motor spins up to speed  and 
the head load is being initiated. there should be a carriage unlock (I assume 
there’s a lock solenoid) and the carriage should start to move.  If the drive 
doesn’t sense movement of the carriage away from the home position after a 
certain time  (is there a carriage home optical sensor or micro switch to 
detect carriage home?) it could give a seek error, even before it gets near the 
disc. 

It could be that locking plate Henk mentioned , the lock solenoid not pulling 
in, or a problem with power getting to the actuator to drive the heads out. 

That’s how an HP drive does it anyway. 

David Collins


Sent from my iPad

> On 7 Nov 2017, at 7:41 am, Henk Gooijen via cctalk  
> wrote:
> 
> 
> 
> Van: Aaron Jackson via cctalk
> Verzonden: maandag 6 november 2017 19:15
> Aan: cct...@classiccmp.org
> Onderwerp: RL02 Spinup fails
> 
> Hi everyone,
> 
> I have managed to hook up an RL02 drive to my PDP-11 (thanks to Dave
> Wade for the drives) . This took me longer than I thought it would - I
> tried with a flat ribbon cable with a DIY terminator going straight into
> board , but couldn't get it to work. Removed the terminator, and the
> fault light turned off. So that's positive.
> 
> I tried to load a cartridge, which I had cleaned, inspected and
> generally appears to be in good condition. It started to spin up and I
> could hear it getting faster, but after 30-40 seconds the fault light
> returns. I made a short video demonstrating this:
> 
> https://www.youtube.com/watch?v=japwBBodO8U
> 
> According to the manual the fault light can appear for the following
> reasons:
> 
> - Drive select error... Surely this would come on at the start?
> - Seek time out error... I'd have to hear the heads move first
> - Write current in heads during sector time error... Same as above
> - Loss of system clock... The fault light would be on from the start.
> - Write protect error... I don't think it got that far
> - Write data error... Same as above
> - Spin error... Is this the only remaining fault?
> 
> So could the only cause be a spin error? I am wondering if the belt is
> slipping or something like that?
> 
> Can anyone offer some advice?
> 
> Thanks,
> 
> Aaron.
> 
> I saw the video.
> It seems that the motor runs and the disk spins up.
> As Tony suggests, check the possible fault sources.
> One obvious fault: is the head still locked? That’s the small
> metal plate fixed with one screw in the top right corner (IIRC).
> 
> Long ago, I tried to run RK07 drives of the RK611 controller
> using a flat cable (not shielded), length 1 meter. The XXDP diags
> gave all sorts of errors that went away after I found the correct
> (shielded) cable BCxx.
> 
> You are correct, the fault light will go on immediately when the
> drive is no connected to the controller. I *think* READY should
> come up even when no terminator is installed.
> 
> One other possible fault. Are you sure the RL02 disk pack is OK?
> If it has been wiped with a magnet, it has become useless as a
> disk pack, but maybe useful for a “wall clock platter”. READY will
> never light up, and possibly there is a time out.
> Not sure you can *hear* the head (carriage) move though …
> 
> 

Re: HP 9836U processor mystery...

[David Collins via cctalk]

The hpmuseum.net is indeed having technical issues at the moment. The after 
effects of an Opsys upgrade to the web server it seems. 

Service will be restored as soon as possible!

David Collins


> On 7 Nov 2017, at 3:52 pm, Josh Dersch via cctalk  
> wrote:
> 
> Hi all --
> 
> I mentioned a few weeks back that I picked up an HP 9836CU workstation.  The 
> "U" variant differs from the normal 9836 in that it contains an upgraded CPU 
> board that allows it to run early versions of HP-UX.  (The "C" indicates that 
> this machine has a color display, which is also cool but not what I want to 
> talk about here today.)
> 
> Information on the Internet varies about what microprocessor the 9836U 
> actually contains -- some sources say it's a 12Mhz 68010, some say it's a 
> 12Mhz 68000.  I found some internal HP marketing text that corroborates the 
> straight-68000 story.  I'd link it here, but hpmuseum.net appears to be 
> having technical issues at the moment.
> 
> My 9836CU has the 12Mhz 68000 (HP internal part number 1820-3288) fitted in a 
> socket on an 09836-66511 board (with the expected 16K SRAM cache and MMU 
> logic) and the processor is identified at power-up as a 68000.
> 
> Just for fun, I swapped the processor with a PGA 68010 and it powers up and 
> runs just fine, and identifies the processor as a 68010.  (Still won't boot 
> the copy of HP-UX 5.0 on the hpmuseum site, though...)
> 
> I'm curious if other people out there with 9836U's can confirm whether their 
> machine has a 68000 or a 68010 in it, I'd just like to settle the internet 
> discrepancy once and for all :).
> 
> - Josh
> 

Re: HP 2640 character set generation manual in the UK

[David Collins via cctalk]

I’ll put it on www.hpmuseum.net as well so we have at least 2 sources...thanks 
for doing this!

David Collins

Sent from my iPad

> On 10 Nov 2017, at 1:29 am, Christian Corti via cctalk 
>  wrote:
> 
> The manual has been scanned and is on our FTP server:
> ftp://computermuseum.informatik.uni-stuttgart.de/hp/hp2648/13245-90001_2640SeriesCharacterSetGeneration_Oct1975.pdf
> 
> Enjoy :-)
> 
> @Al: you may push it to bitsavers
> 
> Christian

Re: Playing with HP2640B

[David Collins via cctalk]

Marc, in addition to Mattis’ forthcoming reply, my recent experience with a 
moldy 2624A was that the hot wire method was very poor. Too hard to get the 
wire in, didn’t melt the ‘glue’ very well, smelly. Gave up when the wire broke. 

What worked best for me was a flat blade screwdriver that was small enough to 
sit sideways in the gap between the front glass and the tube. I sliced sections 
of the glue and picked them out with a hook. I also squirted in a combination 
of RP7 and household cleaner but not sure either did anything other than 
lubricate the surfaces - they may have helped lift the glue a bit. 

My ‘glue’ was like a layer of silicon rubber which hung on for as long as 
possible but I got it all off without any damage. 

I replaced the front glass and held it on with a bead of black silicon rubber 
used for shower glass. I spaced it from the tube with pieces of wire around the 
edges and pulled them out when the silicon dried. 

Worked well for me but keen to hear how Mattis went. 

I didn’t try the hot water soak but it would probably help. 

David Collins


> On 17 Nov 2017, at 6:12 pm, CuriousMarc via cctalk  
> wrote:
> 
> What did you do for the screen mold? Hot wire method to separate CRT from 
> implosion window? Put the CRT in a hot water bath? Chip at the glue?
> Marc
> 
> 
> 
> On Nov 15, 2017, at 11:48 AM, Mattis Lind via cctalk  
> wrote:
> 
> I have been working on a HP 2640B terminal. It was mostly about fixing the
> "screen mold" problem and cleaning up the liquids that had been seeping out
> from the screen down into the bottom.
> 
> The small coaxial wire that connects the 4.9152 MHz clock signal form the
> power supply (never seen a crystal controlled SMPSU before!) to the
> backplane was broken off, but after fixing that the terminal worked fine.
> Just needed some adjustment to the brightness.
> 
> With the correct terminfo installed it worked quite well as a serial
> terminal to a Linux box.
> 
> Then I tried the short 8008 programs that Christian Corti pointed to
> 
> http://computermuseum.informatik.uni-stuttgart.de/dev_en/hp2644/diag.html
> 
> and
> 
> ftp://computermuseum.informatik.uni-stuttgart.de/hp/hp2644
> 
> I tried both a couple of times. The terminal enter the LOADER mode but just
> hangs completely at the end. I tried different baudrates but no difference.
> 
> The selftest STATUS line tell me 40<802 which should indicate that there
> are 4k memory in the terminal. However there should be 5k since there is
> one 4k board and one combined control store and 1 k RAM board. Maybe there
> is a fault in the 1k SRAM? The terminal doesn't complain though.
> 
> Regardless, the programs listed either starts at adress 3 or 36000
> which should then be within the available space.
> 
> The question is, should these program work for the HP2640B as well? It has
> a 8008 but my guess is that the firmware is different from the 2644. What
> is the joint experience regarding this? Has anyone ran these small programs
> above on a HP2640B?
> 
> The HP 2640B firmware consists of four EA 4900 ROM chips which annoyingly
> are not  anything like normal EPROMs. So dumping will need special
> considerations.
> 
> Has anyone dumped the HP 2640B firmware already? I didn't find it on
> bitsavers.
> 
> /Mattis

Re: Playing with HP2640B

[David Collins via cctalk]

Christian do you know the gauge of the wire you used ? And the current?

Maybe I should try that approach again!

David Collins


> On 17 Nov 2017, at 8:09 pm, Christian Corti via cctalk 
>  wrote:
> 
>> On Thu, 16 Nov 2017, CuriousMarc wrote:
>> What did you do for the screen mold? Hot wire method to separate CRT from 
>> implosion window? Put the CRT in a hot water bath? Chip at the glue? Marc
> 
> What we did on one of our 2645 terminals was the hot wire method. We then 
> attached the "implosion" window to the inner of the case.
> 
> BTW is it really an implosion protection? I don't think so because since the 
> 60s, practically all CRTs have a so-called "integral implosion protection" 
> (thick glass on the front and metal band around the edge). I think it is just 
> an anti-glare filter glass. OTOH American CRTs may be completely different in 
> this aspect compared to European ones.
> 
> Christian

Re: HP HP HP !! PING THE CURATOR AT HPMUSEUM IN OZ ED SHARPE TRYING TO REACH U MAKESURE AOL GOES THRU

[David Collins via cctalk]

Hi Ed...  I’m actually in London right now but going back to Melbourne on 
Monday morning.

 Internet connection very bad where I am staying so haven’t had a chance to 
check on what I have but if it’s on the list and you have it scanned please 
send and I’ll put it up on the site. 

Thanks (and I can hear you without shouting :-))

David Collins
+61 424 785 131

> On 12 Jan 2019, at 10:22 pm, ED SHARPE via cctalk  
> wrote:
> 
> HP CURATOR - -HOWDY  HAVE   SOME  MANUALS   WE ARE SCANNING   PRE-7900 DISC  
> SYSTEM!U NEED  AS   U  SAY  DO NOT  HAVE 
> 
> YOUR MOST HELPFUL 150 INFO CAME  TROUGHFROM A  PUBLIC  REQUEST  
> HERE(THANK  YOU THANK  YOU!)  BUT SUSPECTED  THE   AOL BOX  NOT  GOOD  
> GOING TO  YOU  DIRECT ..  HELP?  ED SHARPE

Re: sun 88780 on ebay

[David Collins via cctalk]

I was the mass storage region specialist for HP Australia when these came out. 
They were pretty reliable and compared to the previous 7970 and 7974 drives 
that had start/stop capstans, they were pretty good on tapes. 

I just restored a 7980XC (HP commercial version of the 88780) and it all worked 
after I reinitialised the gains in each channel. 

David Collins
+61 424 785 131

> On 29 Jan 2019, at 2:57 pm, Paul Berger via cctalk  
> wrote:
> 
> 
>> On 2019-01-28 9:19 p.m., Lyle Bickley via cctalk wrote:
>> On Mon, 28 Jan 2019 14:04:42 -0800
>> Al Kossow via cctalk  wrote:
>> 
>>> https://www.ebay.com/itm/132933407806
>>> 
>>> this is interesting because of the price and that all of the Sun
>>> drives I've ever come across had the 800bpi option in them
>> That's been my experience, too. The 88780 I use is a Sun drive with
>> 800/1600/6250.
>> 
>> What I love about these drives is that each track is adjustable
>> electronically for skew - which means one can adjust it to read
>> incorrectly skewed tapes without having to adjust/move the tape head!
>> (Of course, you have to re-adjust it "back" to normal - which makes it
>> something you want to do only when absolutely necessary).
>> 
>> I only wish the 88780's tape handling was a bit more "gentle"...
>> 
>> Cheers,
>> Lyle
> 
> I recall from my field service days these where a pretty fast streamer and 
> very reliable.
> 
> I remember one customer that had one and their data center manager had bought 
> some used tapes from a friend, these tapes where in such bad shape that one 
> of them stuck to the head hard enough to stall the reel motor, which resulted 
> in a billable service call.  Next time I went back the data center manager 
> and his tapes where gone.
> 
> Another call I went on for something other than one of these tape drives, as 
> I am going into the data center I pass a guy pulling tape out of the front of 
> the drive, I thought it looked weird but didn't say anything.  It was a quick 
> call and on my way out I stopp3ed and asked what he was doing and he told me 
> the drive missed the EOT marker and wound completely onto the drive reel and 
> he was now removing it by pulling it out by hand.  I told him he could have 
> saved himself a lot of trouble and not destroyed the tape if he had just 
> wound a few feet onto the supply reel manually, and then a quick load, reset 
> and rewind his reply was "Oh no that would never work!" I was like ok what 
> ever, but by that point it didn't really matter as he already had half a 3600 
> foot reel in a heap in front of him.
> 
> Paul.
> 
> 

RE: sun 88780 on ebay

[David Collins via cctalk]

Al, I'm afraid I don’t...  They were made in Greely Colorado but that plant has 
long since closed and I don’t have any contacts from there. 

-Original Message-
From: cctech  On Behalf Of Al Kossow via cctech
Sent: Wednesday, 30 January 2019 3:55 AM
To: cctalk@classiccmp.org
Subject: Re: sun 88780 on ebay



On 1/28/19 8:08 PM, David Collins via cctalk wrote:

> I just restored a 7980XC (HP commercial version of the 88780) and it all 
> worked after I reinitialised the gains in each channel. 

David, do you know of anyone that has the schematics for these drives?
MANY years ago, someone in Seattle had them, but I never was able to get the 
guy who said he got a copy tell me who that was.

Re: Q: Plotter bed repair with MonoKote?

[David Collins via cctalk]

Also very interested in the use of Monokote to repair plotter beds...any more 
info/experience/tips/traps would be much appreciated. 

David Collins
HP Computer Museum

> On 19 Feb 2019, at 5:37 am, Craig Ruff via cctech  
> wrote:
> 
> 
>> On Feb 18, 2019, at 11:00 AM, dwight wrote:
>> 
>> There were a couple hp XY plotters that had the mylar plate delaminating. 
>> I've reworked these with model airplane mono coat.
> 
> Are you referring to MonoKote (www.monokote.com )?  
> That looks perfect for repairing the gouged bed of one of my 9872C plotters.  
> Is a hot air supply suitable for applying the film, or did you use their 
> heating iron?  I'm guessing a bit of pressure to adhere the film is necessary?

Re: Not DEC related but still hoping for some help: Problems w/ LJ 4+ Printer

[David Collins via cctalk]

You could well have a temp sensitive HV supply or excess moisture in it that 
keeps the HT low until the warmth of operation dries it out. Given the problem 
returns each time, a temp sensitive HV sounds likely. 

Not sure how quickly you could remove and replace the supply but you might 
trying using freeze spray on the supply when the problem occurs and see if that 
fixes it temporarily. 

David Collins
+61 424 785 131

> On 3 Apr 2019, at 11:38 am, Dave Mabry via cctalk  
> wrote:
> 
> Ali via cctalk wrote on 4/2/2019 3:56 PM:
>> I rescued a LaserJet 4+ printer that I have been trying to restore.
>> Initially everything seemed ok and it seemed as if there may be just a bit
>> of an issue with paper pickup which I attributed to old paper in the tray.
>> 
>> However, soon I started getting the accordion paper jam which led me to
>> replacing all the rollers including the transfer roller. Now the paper flows
>> freely! However, I am having a new problem with printing. When I print, the
>> first 5-10 pages initially come out blank. The printer does not produce any
>> errors or error codes. The blank pages are warm (not hot though) as expected
>> out of a LJ.
>> 
>> After closer inspection it seems that the pages are printed SUPER light and
>> gradually get darker the more I use the printer continuously. Eventually the
>> printer starts printing continuous crisp black pages like new. This is a
>> whole page phenomenon (i.e. not gaps, missing areas, etc.).
>> 
>> A picture of the effect can be seen on VFC at:
>> www.vcfed.org/forum/attachment.php?attachmentid=52120&d=1554074105
>> 
>> Sorry for the poor quality picture.
>> 
>> Things I have checked/tried:
>> 
>> 1. Using a brand new NOS toner (according to HP toner does not go bad as
>> long as it was sealed - which this was)
>> 2. Swapping the new transfer roller for the old one - same problem, I have
>> to print out a bunch of pages until the printer starts acting normally.
>> 3. I have checked the HV and an image is being transferred to the drum on
>> the toner cartridge.
>> 4. A visual inspection of the fuser shows it to be ok.
>> 
>> Obviously this is happening printing demo pages so it has nothing to do with
>> computer, OS, SW, drivers, etc. Anybody run into this before? Any
>> ideas/suggestions. My Google fu turned up a bunch of discussions on the
>> laser door not being aligned correctly but that would seem to be a more
>> permanent issue i.e. unless you fixed the door no pages should print ever.
>> Mine gets better on its own after a number of pages are printed. Plus the
>> door and spring are fine - I checked them just in case.
>> 
>> I tried posting on FixYourOwnPrinter.com but for whatever reason the site
>> was not accepting the question. Any other forums you guys would recommend?
>> TIA!
>> 
>> -Ali
>> 
> 
> Just my little bit of input on this...the high voltage power supply is just 
> about the only thing that there is no error code for.  I had one fail and the 
> printer didn't flag any errors.  Changing the HV supply fixed it.
> 
> It sounds to me like your problem is related to the high voltage supply.
> 
> Dave
> 

RE: MPE release history (was: Re: VMS versions)

[David Collins via cctalk]

The HP Computer Museum website now has a link to the version history file 
referenced below.

http://www.hpmuseum.net/exhibit.php?content=3000-MPE%20(Software)

Happy to update it if there is more info or corrections. 

David Collins

-Original Message-
From: cctalk  On Behalf Of Frank McConnell via 
cctalk
Sent: Wednesday, 8 May 2019 1:25 PM
To: r.stricklin ; General Discussion: On-Topic and 
Off-Topic Posts 
Cc: General Discussion: On-Topic Posts 
Subject: Re: MPE release history (was: Re: VMS versions)

On May 6, 2019, at 23:11, r.stricklin via cctalk wrote:
> On May 6, 2019, at 5:02 PM, Frank McConnell via cctech wrote:
>> Likewise, there used to be an article about MPE release history.  Links I 
>> know for it are:
>> 
>> > > (20 Aug 2014) 
>> > 5> (28 Apr 2016)
>> 
>> Naturally it’s been wiped, and archive.org *doesn’t* have a copy, even 
>> though they have other pages under that t5/General directory in both cases.
> 
> I saved a copy in 2012. There are files attached to some of the posts in that 
> forum thread which collate the results and, amazingly, are still accessible: 
> 
> http://community.hpe.com/hpeb/attachments/hpeb/itrc-19/2080/1/294077.h
> tml 
> http://community.hpe.com/hpeb/attachments/hpeb/itrc-19/2081/1/336662.h
> tm
> 
> Grab them while you still can.

Thanks.  Grabbed.  Those have most of the information I was missing being able 
to find easily online: dates and version IDs for classic-3000 MPE releases.  I 
wish I could still get the discussion text that led up to them because they 
don’t entirely fit with my memory.

The mid-1980s were kinda busy with MPE IV Q-MIT and its delta releases, which 
culminated in MPE V/R for the Series II/III and 30/33 (I ran it on a Series 
III), and MPE V/P which didn’t last very long, and then MPE V/E which had a 
future.  Sometimes I have trouble remembering what happened when.  I don’t 
remember more than one MPE V/R release (E.01.00) and it happened some time 
after MPE IV Q-Delta-2.

-Frank McConnell

Re: Scanning Results

[David Collins via cctalk]

While Al is working through his backlog, the HP Computer Museum would be
happy to put them up in the appropriate device webpages.  They would be
a great addition to a site that focuses on vintage HP computing equipment!

On Mon, 22 Jul 2019 at 17:23, Christian Corti via cctalk <
cctalk@classiccmp.org> wrote:

> On Sun, 21 Jul 2019, Guy Dunphy wrote:
> > http://www.bitsavers.org/bitkeepers is something else.
> > The site's contact email is right down the bottom of the front page.
> Visual, to stop spambots.
> > Also Al posts here in cctalk.
>
> Speaking of this, I suggest to rethink the method of submitting scans to
> bitsavers. I did successfully transfer stuff there in the past, but my
> last attempts (putting the scans available for downloading, naming them
> in bitsavers-type file name syntax and writing an email to aek) resulted
> in nothing. No answer, no uploads to bitsavers, nothing. I did that a
> couple of times in different intervals, each attempt was futile.
> I highly appreciate and support bitsavers, I just can't contribute
> anything. For example, I would think that scans of original HP 98x0
> desktop calculator blueprints would be something of interest.
> So for the moment, I have to keep all my scans local (but accessible).
>
> Christian
>

Re: Decaying foam on PCBs

[David Collins via cctalk]

In Australia there’s this product ;

https://awareenvironmental.com.au/product/sticky-spot-goo-dissolver/

It’s citrus based but I haven’t had any bad effects on PCBs. It does affect 
some styrene plastics but in general it’s safe and very effective. 

If you aren’t in Aus, a similar citrus based product should work - just my 
experience. 

David Collins
HP Computer Museum


> On 28 Aug 2019, at 10:39 am, Jules Richardson via cctalk 
>  wrote:
> 
> 
> I picked up a couple of HP 5036A logic trainers today, both of which have had 
> goopy decaying foam come into contact on their PCBs. What's effective at 
> removing it? I've only ever had problems with it in locations where I can use 
> things such as citrus-based cleaners, but I'm a bit wary of using those 
> around a PCB. Is regular Dawn/water likely to work?
> 
> thanks!
> 
> Jules
> 
> 

Re: HP3000/917LX available in Vacaville

[David Collins via cctalk]

“3000-L” ?  Is that another group?



> On 29 Sep 2019, at 9:27 am, Stan Sieler via cctalk  
> wrote:
> 
> Lee writes:
> 
>> This is a *very* nice entry-level HP3000/MPE system based on PA-RISC
>> architecture. But one note - the 917 had the soldered TOD battery on the
>> motherboard, vs. the FRU TOD battery in the later 918. Not a reason to skip
>> if you are interested in this machine.
> 
> 
> True, there's been some discussion of that over on HP3000-L.
> 
> IIRC, it's still possible to boot even if the battery is dead ...
> boot to the ISL> prompt, run clkutil, set the date, then exit to ISL>,
> then run 'START'.
> 
> Stan

Re: HP3000/917LX available in Vacaville

[David Collins via cctalk]

Thanks!

On Mon, 30 Sep 2019 at 08:15, Frank McConnell  wrote:

> On Sep 29, 2019, at 7:48, David Collins wrote:
> > “3000-L” ?  Is that another group?
>
> Different from this one.  hp300...@raven.utc.edu, emphasis on the
> “3000-L” part.
>
> LISTSERV Web page with desciption and archives at <
> https://raven.utc.edu/cgi-bin/WA.EXE?A0=HP3000-L>.  Has been around
> longer than the archives show, I think I’ve been subscribed from one
> address or another since the early 1990s.
>
> -Frank McConnell
>
>

RE: Info / packs for Amcodyne 7110 "Arapahoe" drive?

[David Collins via cctalk]

I have one or two packs and a drive in the museum but that's all.  If I had a 
surplus of packs I'd be happy to share...

David Collins

-Original Message-
From: cctalk  On Behalf Of Al Kossow via cctalk
Sent: Saturday, 11 January 2020 9:02 AM
To: General Discussion: On-Topic and Off-Topic Posts 
Subject: Re: Info / packs for Amcodyne 7110 "Arapahoe" drive?

I checked my drive, pn 7110S-HP
likely SASI, that DTC board is a SASI to HPIB bridge

Maybe HPMuseum knows where there are used packs. My drive looks like it came 
off of a HP1000 system (LU40 and 42)

I just checked all of the scans I made from Crisis Computer's service library 
and it figures I didn't scan the binder with 7907 info. From the binder 
inventory I did, they had the depot hardware manual.



On 1/10/20 1:47 PM, Josh Dersch wrote:
> Thanks everyone for the information -- that definitely looks like the 
> same drive mechanism.  I had no idea HP sold a drive like that.
> 
> I think I may wait for the price to come down a bit on those packs, though :).

Re: Wanted, Papertape Reader for Archiving Tapes

[David Collins via cctalk]

Further to Dave’s post below, I’m happy to share the Arduino code and schematic 
if anyone has a suitable reader and wants to try it. It was indeed designed to 
interface to the HP2748 but is pretty simple and could be adapted to any 
similar reader. 

David Collins

Sent from my iPad

> On 29 Apr 2020, at 6:33 am, J. David Bryan via cctech  
> wrote:
> 
> On Tuesday, April 28, 2020 at 17:56, Tony Duell via cctech wrote:
> 
>> The HP2748 is a common-ish example of this type of un[i]t. 
> 
> David Collins of the HP Computer Museum and I just recently completed 
> reading some 200+ paper tapes from the museum collection.  He used a 2748 
> coupled with a custom Arduino-based interface to produce plain-text files 
> containing an octal representation of the tape bytes.  We passed these 
> through a small program to convert them to binary files and a second 
> program to verify checksums of those tapes containing relocatable or 
> absolute binary object data.  The resulting files can be used as is with 
> the HP 2100 SIMH simulator or could be punched back into physical paper 
> tapes if desired.
> 
>  -- Dave
> 

RE: Wanted, Papertape Reader for Archiving Tapes

[David Collins via cctalk]

I've pulled together details of the controller used with an HP2748 paper tape 
reader to dump a bunch of tapes from the HP Computer Museum's collection with 
the help of J. David Bryan.

The details are at this link..

https://drive.google.com/open?id=1KaJkVgYzPusJN9tLf4IaSIa104fvLhUs

The unit and Arduino code are both pretty rough and ready and I'm sure can be 
improved - but they served their purpose!

Hope it is of use to others...  

Now to get those new tape files published...

David Collins
www.hpmuseum.net


-Original Message-
From: David Collins  
Sent: Wednesday, 29 April 2020 7:34 AM
To: J. David Bryan ; General Discussion: On-Topic Posts 

Subject: Re: Wanted, Papertape Reader for Archiving Tapes

Further to Dave’s post below, I’m happy to share the Arduino code and schematic 
if anyone has a suitable reader and wants to try it. It was indeed designed to 
interface to the HP2748 but is pretty simple and could be adapted to any 
similar reader. 

David Collins

Sent from my iPad

> On 29 Apr 2020, at 6:33 am, J. David Bryan via cctech  
> wrote:
> 
> On Tuesday, April 28, 2020 at 17:56, Tony Duell via cctech wrote:
> 
>> The HP2748 is a common-ish example of this type of un[i]t. 
> 
> David Collins of the HP Computer Museum and I just recently completed 
> reading some 200+ paper tapes from the museum collection.  He used a 
> 2748 coupled with a custom Arduino-based interface to produce 
> plain-text files containing an octal representation of the tape bytes.  
> We passed these through a small program to convert them to binary 
> files and a second program to verify checksums of those tapes 
> containing relocatable or absolute binary object data.  The resulting 
> files can be used as is with the HP 2100 SIMH simulator or could be 
> punched back into physical paper tapes if desired.
> 
>  -- Dave
> 

Re: Help Identifying Components

[David Collins via cctalk]

If you could wait, getting one of those ‘unknown component testers’ would help 
you!

David Collins

> On 25 Dec 2017, at 5:27 am, Rob Jarratt via cctalk  
> wrote:
> 
> I am continuing work to reverse engineer the schematic for my H7826 PSU. I
> have removed one of the daughter cards in order to draw its schematic, but I
> can't identify some of the surface mount components on it. I have posted a
> picture of it here:
> https://rjarratt.files.wordpress.com/2017/12/50-19530.jpg
> 
> 
> 
> The ones I can't identify are:
> 
> 
> 
> 1.   The component with two wide pins that looks like an IC
> approximately in the middle of the board. It is marked M106 (or it might be
> AA106) and 91813 underneath. I think it may be a resistor, but I am not
> sure.
> 
> 2.   Just to the right of this is another much thinner two-pin component
> which is black on top with a kind of white notch. I have no idea at all what
> this is.
> 
> 3.   The three 3-pin black components to the left of the first
> component. Two of them are marked "2T L" (or is that "ZT L"?), one appears
> to be marked "2X I" (letter "ih", not letter "el"). I guess they are
> transistors, but they may not be of course, and I don't know their pinout.
> 
> 
> 
> Any help with identifying what these are would be very helpful.
> 
> 
> 
> Thanks
> 
> 
> 
> Rob
> 

Re: Apollo Software

[David Collins via cctalk]

The HP Computer Museum would be happy to host copies of any Apollo software if 
it can be imaged..

David Collins

Sent from my iPad

> On 22 Jan 2018, at 4:50 am, Josh Dersch via cctalk  
> wrote:
> 
>> On 1/21/2018 7:22 AM, Bill Gunshannon via cctalk wrote:
>> Is there any interest or value in copies of SR7.0  "Aegis"
>> or should I just scratch them and add them to my other 8"
>> disks?  (Yes, I used to have an Apollo in my house!!  Made
>> a great heater during those long cold winters.)
>> 
>> bill
>> 
>> 
> 
> Definitely worth saving.  I have facilities for imaging these and I'd be 
> happy to take them on, if no one else is excited to do so :).
> 
> - Josh

Re: Good Electronic/computer stores SF area

[David Collins via cctalk]

If you are after components Arrow Electronics and Jameco are good. 

David Collins


> On 7 Feb 2018, at 10:23 am, Douglas Taylor via cctalk  
> wrote:
> 
> I haven't been in the San Francisco area in about 30 years.
> 
> I remember a number of used computer/electronics stores back then, can't 
> remember any names except Weird Stuff Warehouse.
> 
> Are there any stores that are worth a visit?
> 
> What about outside of the SF area?
> 
> Doug
> 

Re: micro pdp11/83 power supply

[David Collins via cctalk]

Check the mains filter x2 capacitor. 

Sent from my iPad

> On 13 May 2018, at 3:51 pm, Waldemar Brodkorb via cctech 
>  wrote:
> 
> Hi,
> 
> I started to revive an old Micro PDP11/83 I have for over 12 years
> now. It is fully assembled and last time I tried to start the
> machine it some kind of started.
> My biggest issue at the moment is the power supply.
> 
> After the machine is running for a while, let's say 10 minutes and
> then when I poweroff, the power supply starts producing a lot of
> dense smoke. The smell is very penetrant.
> 
> What can I do with the power supply? Do I need to exchange it
> completely or just parts of it?
> 
> At the moment I removed it from the case like described here:
> http://www.bitsavers.org/pdf/dec/pdp11/microPDP11/EK-MIC11-TM-002_MicroPDP11_Systems_Technical_Manual_Sep85.pdf
> 
> Thanks in advance for any starting hints,
> Waldemar

Re: HP Series 9000 early 1980’s computer hardware

[David Collins via cctalk]

I agree with Al.  Chas approached the HP Computer Museum on this and as much as 
they would be great to add to the collection, the shipping costs to Australia 
and the fact that the museum is more in a consolidation mode than acquisition 
meant we weren’t able to take them in. 

Hopefully someone close by to him would like to have these units!

David Collins

Sent from my iPad

> On 18 May 2018, at 1:35 am, Al Kossow via cctalk  
> wrote:
> 
> Series 500 machines are quite rare. Someone should save these.
> 
>> On 5/16/18 10:00 PM, Lawrence Wilkinson via cctalk wrote:
>> 
>> I own several HP 9020 work stations along with peripheral gear associated 
>> with that series.
> 
> 

Re: And if you collect hp. which... we do of course at SMECC so need to hear if you qall have any of this.

[David Collins via cctalk]

I have a 3000 Series 70... but it’s in Australia!

David Collins
+61 424 785 131

> On 24 Jul 2018, at 11:32 am, Ed Sharpe via cctalk  
> wrote:
> 
> 
> And  if   you  collect hp.  which...   we  do  of  course at  SMECC  so need 
> to hear  if  you  all have any of  this.
> 
> 
>  
> The scanjet   BW  is   first  HP...  and   scanject 2c  is  first  color 
> scanner  hp
> always  accepting  gifts  of these  2.
>  
> IN  hp lasers   
> 2686a   first HP laser...  then there is a  first  color  laser  HP  too 
> ( if  you can lift it.)
>  
> Would also suggest saving and  we need a  clean one   hp  500  which  was a  
> 2886a  with a  bunch of  bins  was  damn  expensive   so not a lot  of them 
> around compared to  2886a
>  
> Office jet hp  officejet ( no suffexhad  deskjet   printer  in  it.   
>  was  first as I  remember
>  
> HP  Paint jet   first  color  we need one...  uses  tracer feed  paper.  
> just  found  my old  sales  binder  for it  with all the  samples etc  as  
> issued  by hp
>  
>  
> NEED  HP 3000  cx  series  II  series III  Model  30  model  40  etc etc etc
>  
>  
>  
> Looking forHP  VECTRA  Has bizzare  moue  interface etc...
>  
> HP  150 -  WORKING  OF  NOT  PLUS - -Looking   for  any AND  ALL hp  150  
> PARTS  PIECES SALES  LITPOSTERS  WITH MONARCH BUTTERFLY  ETC...
>  
> Looking   for   some  HP  calc  stuff
> Looking  for  HP  110  portable  and portable  plus   also 
> NEED VECTRA  CS PORTABLE (Bless its  wretched  soul!)
>  
>  
> I  guess if  it   says  HP  would  like to  hear  about it.
>  
>  
> HEY LOOKING  FOR  ANY   ADVERTISING  ITEMS  FROM  COMPUTER EXCHANGE  PHX  TOO!
>  
> Ed Sharpe Archivist  for SMECC ( Retired  CEO  Computer Exchange   Phx   AZ)

Re: And if you collect hp. which... we do of course at SMECC so need to hear if you qall have any of this.

[David Collins via cctalk]

No more room in Oz!

David Collins
+61 424 785 131

> On 24 Jul 2018, at 12:06 pm, ben via cctalk  wrote:
> 
>> On 7/23/2018 7:58 PM, Ed Sharpe via cctalk wrote:
>> Darn! Alas  the  freight  would  be  a killer... Ed#
> Is that you moving the computer to the USA or you moving
> yourself and all your stuff to OZ. I suspect that freight would still
> be afordable because it would go ship rather than overnight.
> Ben.
> 
> 
> 

RE: HP-2116 front panel lamps

[David Collins via cctalk]

Christian, when I was restoring the HP Computer Museum's 2116A I ordered a
bunch of these 345 bulbs from 1000bulbs.com - but it seems they no longer
stock them. 

I did find this listing though which looks current...
https://www.lighting-pros.com/eiko-345-t-1-3-4-midget-flanged-sx6s-case-of-1
0

They are around 0.04A current draw - not 0.75A!

Hope that helps,

David Collins
www.hpmuseum.net



-Original Message-
From: cctalk  On Behalf Of Christian Corti
via cctalk
Sent: Wednesday, 25 July 2018 6:41 PM
To: cctalk@classiccmp.org
Subject: HP-2116 front panel lamps

Hi,

I need to replace several broken lamps from our HP-2116B front panel. The
old/original ones are CM-345 or OL-345. This makes sense, they are rated 6V
40mA 1 hours.

BUT:
The maintenance manual says something different and is even wrong and
inconsistent.
HP part number is 2140-0035, description "Lamp, Incadescent, 6.3V, 0.75A"
This can't be true. 92*0.75A would be 400W alone for the front panel
lights...
The manufacturer code is 71744 (Chicago Miniature Lamp Works), mfg part
number 1775. That is indeed a 6.3V lamp, but 0.075A (better!). Problem: 
that is a midget _screw_ base lamp, so wrong socket and only rated for
1000h. The panel and switches need a midget flanged base lamp. Who wrote
that manual? Was he drunk? ;-)


Christian

RE: Troubleshooting HP 2116B

[David Collins via cctalk]

Christian, I tried to track down details of the 1820-0183 and the manuals
appear to say it's an RCA item, part number 80170 but I cant find anything
with that number anywhere - you are probably on the right track with a
CA3082A or similar.  

My experience in fixing similar faults on the memory boards of the 2116A was
that the transistors were often leaky which created stuck bits.  Sometimes I
had to swap parts around between working and non-working bits to isolate the
faulty items and it turned out exact replacements for the bad transistors
were still available for purchase. 

If you're prepared to swap components around on your boards to troubleshoot,
you might by lucky and find that the ICs are OK.  

David Collins

-Original Message-
From: cctalk  On Behalf Of Christian Corti
via cctalk
Sent: Friday, 27 July 2018 9:14 PM
To: cctalk@classiccmp.org
Subject: Troubleshooting HP 2116B

Ok, so I've got the computer almost running now. I now need to fix both
sense amplifier cards. One (0..4k) sometimes reads a one for bit 3 after the
machine has warmed up. The other (4..8k) has a stuck one for bit 7.
Swapping these cards make the errors move to the other core bank
respectively.

I have the newer cards, 02116-6298, not the older 02115-6001 The latter has
CA3028A used as sense amplifiers. My card uses HP
1820-0183 (metal can IC from RCA). I guess that it is also a CA3028A or
maybe a CA3053. Can anyone confirm this?

Next, the manual on bitsavers (02116-9153_2116B_Vol2_Oct70, and the same as
found on the hpmuseum site) not only contains some errors (see my other post
about the front panel lamps). It has also some badly scanned pages with
parts missing, notably page 5-50 (PDF page 350) lacks the right part of the
page. Is there a better scan available? My 1968 copy does not list the
02116-6298.

Christian

Re: Identifying TO-3 w/HP house numbering

[David Collins via cctalk]

The 9816 uses a BUZ45 - might be the same as the 2382?

David Collins
+61 424 785 131

> On 16 Oct 2018, at 3:24 pm, Curious Marc via cctech  
> wrote:
> 
> Forgot to mention, I have a 2382A that works (affectionately known as the 
> "Munchkin" terminal). I could measure some stuff in mine for comparison if 
> that could help out. 
> For the HP curious, the 2382A makes an appearance at the end of one of my 
> videos:
> https://youtu.be/GLkhcDAOVPo?t=19m50
> It is very cute (I think) ;-)
> Marc
> 
>> On Oct 16, 2018, at 12:08 AM, Curious Marc  wrote:
>> 
>> Can't find it either in any of the X-ref lists I have. As you know already, 
>> 1854 are usually NPN transistors, but around these numbers I see mostly 
>> Darlingtons in my collection. So maybe that's what you have, and why the 
>> junctions would test weird.
>> Marc
>> 
>>> On Oct 15, 2018, at 10:21 PM, Josh Dersch via cctalk 
>>>  wrote:
>>> 
>>> Hey all --
>>> 
>>> Got an HP 2382A terminal I'm attempting to resurrect.  I get no video, no
>>> heater, no high voltage.  What I believe to be the horizontal output
>>> transistor appears to be bad, but I'm not sure if this thing contains
>>> internal diodes that might be throwing off my testing attempts.  It's
>>> labeled "1854-0900."  Anyone know what this actually is?  (Anyone have a
>>> service manual for this terminal?)
>>> 
>>> Thanks,
>>> Josh

RE: One more thing to fix... HP9000/380 power supply

[David Collins via cctalk]

Carlos, from my experience in fixing a number of switch mode supplies in HP 
gear, if the supply is dead but you have full voltage across the big filter 
caps (~340v DC), it's typically a problem with the power supply to the 
regulator that drives the primary switching transistor.  That 'power supply' 
can be as simple as a high value resistor (maybe 470K), usually 1 watt or so, 
that has just gone open circuit with no external signs of failure. 

Assuming you are aware of the risks inherent in opening these supplies up and 
applying power, you might want to check if you have the high voltage DC and if 
so, do some basic checks of components on the mains side of the main 
transformer.   All the usual suggestions around checking for leaky/failed 
filtering caps on the low voltage DC outputs also apply of course. 

David Collins

-Original Message-
From: cctalk  On Behalf Of Carlos E 
Murillo-Sanchez via cctalk
Sent: Friday, 12 February 2021 1:55 PM
To: General Discussion: On-Topic and Off-Topic Posts 
Subject: One more thing to fix... HP9000/380 power supply


This decade seems to have increased the number of failing things in such a way 
that the "to be repaired" backlog is growing much faster than I can get to 
diminish it. Argh.  A month ago my trusty HP9000/380 ran just fine and I booted 
the different OS's in the SCSI and HPIB drives connected to it (this particular 
machine is interesting because the
9000/300 port of NetBSD was partly developed in it: it was Mike Wolfson's). 
Yesterday, it failed to turn on; the power supply is dead. So I unracked the 
pile of drives and the computer, checked for obvious things (the fuse is fine, 
and nothing in the power supply is swelled up or leaking, or browned by heat; 
visually, it looks new; the HV caps seem to hold a charge).  I need the 
schematics for the power supply (at least the output connector; I can work my 
way back from that)  and also those for the backplane in this hp9000/380.  A 
preliminary search at bitsavers and elsewhere did not help.  Does anybody have 
these?

In the meantime, I finally improved the mainboard (had the parts for a long 
while) from a 380 to a 385 by changing the clock generator, and replacing the 
68040RC25 with an RC33.

I ran this machine as a web server continuously for ten years in the 2000's, 
totally exposed.  Many tried to hack it... and failed. Another personal 
connection to this architecture is that I used Apollos and
hp9000/300 at UW-Madison back in 1989-91.  Boy, did I crunch numbers...

carlos.

RE: name/model of HP portable printer? (not HP 2225x) circa 1993

[David Collins via cctalk]

How about this...

http://www.hpmuseum.net/display_item.php?hw=311

David Collins
www.hpmuseum.net

-Original Message-
From: cctalk  On Behalf Of Stan Sieler via cctalk
Sent: Friday, 12 March 2021 6:22 PM
To: General Discussion: On-Topic and Off-Topic Posts 
Subject: name/model of HP portable printer? (not HP 2225x) circa 1993

Hi,

Does anyone remember the product name or number of the tiny HP portable printer 
(*not* an HP 2225 of any kind!) that probably came out about the same time as 
the HP Omnibook 300 (1993)?
(My google-fu failed me.)

IIRC, it was able to print on regular paper 8.5" wide, probably using a 
thinkjet mechanism.
Battery powered, probably black, probably HP-IL interface.

I remember coveting one when I got my first Omnibook, but by that time they 
were off the market and the only one I ever saw wasn't for sale (I did borrow 
it for a few days, it worked well).
The use of standard (in the U.S.) paper, plus the tiny size, had be interested 
in it.

thanks,

Stan

Re: Melted computer feet

[David Collins via cctalk]

Goo Gone is one option but may harm the plastic case. 

Orange based cleaners are also good - the ones that remove stickers etc

Sent from my iPad

> On 20 May 2021, at 10:50 am, Zane Healy via cctalk  
> wrote:
> 
> Is there any recommended method for cleaning up melted “rubber” feet on a 
> plastic case?
> 
> I’m trying to determine if I can revive the VAXstation 4000/90 I received 
> from a list member, back around 1998 (it’s never worked).  When I pulled it 
> out, I discovered that its feet have melted, and I’m assuming probably made a 
> mess on the disk enclosure for my VAXstation 3100 that it was on top of.
> 
> Zane
> 
> 
> 

Re: Melted computer feet

[David Collins via cctalk]

I’ve used Orange based cleaners a lot in restoring old HP equipment. It does 
affect some plastics -polystyrene in particular- but it’s not as harsh as Goo 
Gone and should be wiped off quickly anyway. 

It does not affect most other plastics in my experience.  

David

Sent from my iPad

> On 20 May 2021, at 5:13 pm, Christian Corti via cctalk 
>  wrote:
> 
> On Thu, 20 May 2021, David Collins wrote:
>> Orange based cleaners are also good - the ones that remove stickers etc
> 
> That will dissolve plastics! Don't use orange based cleaners. I just use 
> normal 97% ethanol (called Spiritus here). That will work just fine.
> 
> Christian