Re: HP vintage boards being sold as scrap

[Guy Dunphy via cctalk]

At 05:38 PM 24/09/2019 -0500, Cindy wrote:
>https://www.ebay.com/itm/174036836066

Sigh. A whole lot of HP 3497A data acquisition plugins (in the back there, with 
the pull rings):
https://i.ebayimg.com/00/s/MTIwMFgxNjAw/z/ZrUAAOSwI5Fdg5KH/$_57.jpg

Not sure which cards. Maybe optically isolated A/D or D/A?

I have a 3497A. Oh well.

This is going to be as frustrating as that other guy selling a huge box of HP 
cards for gold, for $600.
https://www.ebay.com/itm/60-lbs-vintage-1970s-HP-interface-boards-gold-yellow-fingers-for-scrap-recovery/383039137321
Huh, didn't sell yet, what a surprise. And he's dropped the price a whole $50. 
Must have agonized over that.

Guy

Pro 350 for sale on Craigslist

[Wayne S via cctalk]

Just saw this …

https://orangecounty.craigslist.org/sys/d/laguna-niguel-vintage-dec-computer-350/6983617174.html

Ad Says…
Vintage DEC Computer 350 Pro System - $450 (Laguna Niguel)
Vintage Digital Equipment Corporation (DEC) computer system 350 Professional ( 
based on PD-11 chipset) 10 MB HDD , Monitor VR-201, Printer : Letterprinter 100 
, Enclosure, Extensive set of Documentation. These Items are intended for 
collectors who have good knowledge and experience with old computers

RE: Wanted: Scan of RF modulator article in Sept. 1978 Radio Electronics

[Wayne S via cctalk]

Look here.

https://www.americanradiohistory.com/Archive-Radio-Electronics/70s/1978/Radio-Electronics-1978-09.pdf






From: cctalk  on behalf of William Sudbrink via 
cctalk 
Sent: Tuesday, September 24, 2019 5:36:57 PM
To: 'General Discussion: On-Topic and Off-Topic Posts' 
Subject: Wanted: Scan of RF modulator article in Sept. 1978 Radio Electronics

Hi,



I'd like to read the second part of the article found here:



https://www.schematicsforfree.com/archive/file/Video/Circuits/Video%20Modula
tor.pdf



I don't have a real print of the magazine and my Google-Fu fails me if it's
already scanned somewhere.



Thanks,

Bill S.





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Re: simh, professional 350, 380

[Eric Smith via cctalk]

On Sun, Sep 22, 2019 at 6:29 AM emanuel stiebler via cctalk <
cctalk@classiccmp.org> wrote:

> I saw an old version from 2006 as "xhomer" which emulates the
> professional 350. Was there anywhere a version, which emulates the 380


I used to work at the same company as the author. He didn't own a 380 and
had no real interest in it.

Re: Wanted: Scan of RF modulator article in Sept. 1978 Radio Electronics

[Randy Dawson via cctalk]

The next issue is here (as well as all pop tronics and radio electronics, Byte 
and more)
https://www.americanradiohistory.com/Archive-Radio-Electronics/70s/1978/Radio-Electronics-1978-09.pdf
'' 1' - 
americanradiohistory.com
Tired of Reruns? Fluke counters with a new series in the 5 Hz -520 MHz/time 
slot. If you're paying over $345 for a counter and getting fre- quency only, 
tune in on our new 1900 -series of priced -right multicounters. Five different 
models offer both time and frequency, with award -worthy performance and 
features; the ratings are
www.americanradiohistory.com
Good luck Bill!

Randy


From: cctalk  on behalf of William Sudbrink via 
cctalk 
Sent: Tuesday, September 24, 2019 5:36 PM
To: 'General Discussion: On-Topic and Off-Topic Posts' 
Subject: Wanted: Scan of RF modulator article in Sept. 1978 Radio Electronics

Hi,



I'd like to read the second part of the article found here:



https://www.schematicsforfree.com/archive/file/Video/Circuits/Video%20Modula
tor.pdf



I don't have a real print of the magazine and my Google-Fu fails me if it's
already scanned somewhere.



Thanks,

Bill S.





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Re: Wanted: Scan of RF modulator article in Sept. 1978 Radio Electronics

[Bill Degnan via cctalk]

I have them.  what is the title or page numbers of the missing nm pages?

On Tue, Sep 24, 2019, 8:37 PM William Sudbrink via cctalk <
cctalk@classiccmp.org> wrote:

> Hi,
>
>
>
> I'd like to read the second part of the article found here:
>
>
>
>
> https://www.schematicsforfree.com/archive/file/Video/Circuits/Video%20Modula
> tor.pdf
> 
>
>
>
> I don't have a real print of the magazine and my Google-Fu fails me if it's
> already scanned somewhere.
>
>
>
> Thanks,
>
> Bill S.
>
>
>
>
>
> ---
> This email has been checked for viruses by Avast antivirus software.
> https://www.avast.com/antivirus
>

Wanted: Scan of RF modulator article in Sept. 1978 Radio Electronics

[William Sudbrink via cctalk]

Hi,

 

I'd like to read the second part of the article found here:

 

https://www.schematicsforfree.com/archive/file/Video/Circuits/Video%20Modula
tor.pdf

 

I don't have a real print of the magazine and my Google-Fu fails me if it's
already scanned somewhere.

 

Thanks,

Bill S.

 



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Re: Raymond Check discusses MS DOS Floppy Disk Cache

[Chuck Guzis via cctalk]

On 9/24/19 4:13 PM, Fred Cisin via cctalk wrote:

> COULD somebody go from write protected 8" or non-write-protected 5.25"
> (did you sense door open?) to disk out of drive in under 250ms, and then
> lso go from door open, no disk to non-write protected disk in drive
> (door still open?) in under another 250ms?   I can't.  But if somebody
> could, then you just need to change that user's settings to about 100ms.

It's impossible to flip open a drive and change floppies in less than a
couple of seconds.   We tried.   The drives were MIcropolis and MPI drives.

--Chuck

Re: Raymond Check discusses MS DOS Floppy Disk Cache

[Fred Cisin via cctalk]

https://devblogs.microsoft.com/oldnewthing/20190924-00/?p=102915


On Tue, 24 Sep 2019, Chuck Guzis via cctalk wrote:

I don't quite get the bit about the NAND gate, but back in the days of
5.25" floppies there was a way around that one.
One need only monitor the drive write-protect status every tick or so.
If it toggles, invalidate the cache.
I implemented it on a 8085 system, checking the write protect status
every 250 msec.  The drive needn't be spinning.  If you insert or remove
a 5.25" disk, the status will change.
We even went a bit further and checked to see if the disk contained any
files open for writing.  If so, we sounded an alert and froze the system
until the subject disk was re-inserted.  This reduced the number of
disk-swapping related errors essentially to zero.


And, it presumably worked just fine.
They tried TWO of their staff, and neither could change a disk in less 
that 2 seconds.


COULD somebody go from write protected 8" or non-write-protected 5.25" 
(did you sense door open?) to disk out of drive in under 250ms, and then 
lso go from door open, no disk to non-write protected disk in drive (door 
still open?) in under another 250ms?   I can't.  But if somebody 
could, then you just need to change that user's settings to about 100ms.

HP vintage boards being sold as scrap

[Electronics Plus via cctalk]

https://www.ebay.com/itm/174036836066

 

Cindy Croxton

Electronics Plus

1613 Water Street

Kerrville, TX 78028

830-370-3239 cell

sa...@elecplus.com

 



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Re: sa...@elecplus.com

[Richard Pope via cctalk]

Hello all,
Every couple of years or so I completely disassemble my keyboard. I 
wash the case and the keys in hot soapy water and thoroughly rinse. I 
wipe everything else down. This gets rid of the hair and other junk that 
builds up in between the keys and the plungers.

GOD Bless,
rich!

On 9/24/2019 9:07 AM, Noel Chiappa via cctalk wrote:

Re: Cleaning an old keyboard
Hey, that spiel would be a good start to a great article on the CHWiki,
'Cleaning keyboards'! (Not sure if any of the other replies contained
anything worth picking up.)

Noel

RE: DEC RP04 service manual available

[Rich Alderson via cctalk]

> From: Noel Chiappa
> Sent: Tuesday, September 24, 2019 10:10 AM

>> From: Evan Koblentz

>> I know of two RP04 drives in the wild. One belongs to a private
> > collector. VCF has the other.

> Right, but does VCF need it scanned?

> Oh, one other place that might have one: the MIT MC KL10 had a couple of
> RP04's; when it was taken away to Scandanavia, they might have gone with it.
> I think that machine is now at LCM?

Yes, and having the RP04 manual scanned would probably be long term helpful.

Rich



Rich Alderson
Sr. Systems Engineer
Living Computers: Museum + Labs
2245 1st Ave S
Seattle, WA 98134


http://www.LivingComputers.org/

Re: Raymond Check discusses MS DOS Floppy Disk Cache

[Chuck Guzis via cctalk]

On 9/24/19 12:53 PM, ben via cctalk wrote:
> Well I am guessing, the time the flopppy motor was kept on after
> a block read/write. Ben.

No, the spin-down delay is much longer than that--take a look at the
5150 BIOS.


--Chuck

Re: Raymond Check discusses MS DOS Floppy Disk Cache

[ben via cctalk]

On 9/24/2019 1:40 PM, Christian Liendo via cctalk wrote:

I meant to say Raymond Chen and it didn't notice the spell check change

Sometimes modern technology sucks.

On Tue, Sep 24, 2019 at 3:18 PM Christian Liendo  wrote:


How did MS-DOS decide that two seconds was the amount of time to keep
the floppy disk cache valid?

https://devblogs.microsoft.com/oldnewthing/20190924-00/?p=102915



Well I am guessing, the time the flopppy motor was kept on after
a block read/write. Ben.

Re: Raymond Check discusses MS DOS Floppy Disk Cache

[Chuck Guzis via cctalk]

On 9/24/19 12:40 PM, Christian Liendo via cctalk wrote:
> I meant to say Raymond Chen and it didn't notice the spell check change
> 
> Sometimes modern technology sucks.
> 
> On Tue, Sep 24, 2019 at 3:18 PM Christian Liendo  wrote:
>>
>> How did MS-DOS decide that two seconds was the amount of time to keep
>> the floppy disk cache valid?
>>
>> https://devblogs.microsoft.com/oldnewthing/20190924-00/?p=102915

I don't quite get the bit about the NAND gate, but back in the days of
5.25" floppies there was a way around that one.

One need only monitor the drive write-protect status every tick or so.
If it toggles, invalidate the cache.

I implemented it on a 8085 system, checking the write protect status
every 250 msec.  The drive needn't be spinning.  If you insert or remove
a 5.25" disk, the status will change.

We even went a bit further and checked to see if the disk contained any
files open for writing.  If so, we sounded an alert and froze the system
until the subject disk was re-inserted.  This reduced the number of
disk-swapping related errors essentially to zero.

--Chuck

Re: Raymond Check discusses MS DOS Floppy Disk Cache

[Christian Liendo via cctalk]

I meant to say Raymond Chen and it didn't notice the spell check change

Sometimes modern technology sucks.

On Tue, Sep 24, 2019 at 3:18 PM Christian Liendo  wrote:
>
> How did MS-DOS decide that two seconds was the amount of time to keep
> the floppy disk cache valid?
>
> https://devblogs.microsoft.com/oldnewthing/20190924-00/?p=102915

Raymond Check discusses MS DOS Floppy Disk Cache

[Christian Liendo via cctalk]

How did MS-DOS decide that two seconds was the amount of time to keep
the floppy disk cache valid?

https://devblogs.microsoft.com/oldnewthing/20190924-00/?p=102915

Re: sa...@elecplus.com

[ben via cctalk]

On 9/24/2019 8:19 AM, Electronics Plus via cctalk wrote:

There is an entire process I go through. Paintbrush and vacuum for removing
loose debris. Various cleaners. Ultrasonic cleaner for the caps. It can take
over an hour to really get one looking new again.


Well what is it for cleaners?

Ben.

Re: Data General AViiON AV300D docs?

[Chris Hanson via cctalk]

Thank you! 

  -- Chris

> On Sep 24, 2019, at 7:32 AM, alan--- via cctalk  wrote:
> 
> 
> I mean to add, that view is looking through the machine not the connector.  
> So with the PSU oriented in it's natural position, that is the pinout of the 
> solder pin tails coming up through the PSU PCB or the face of the connector 
> on the main board.
> 
> Also I never scoped the control pins to figure out their roles.  The board 
> and mounting hole dimensions are in the Eagle files.
> 
> -Alan
> 
> On 2019-09-24 10:27, alan--- via cctalk wrote:
>> I stuck the files up here for the next few weeks as I don't have a
>> project page for it yet:
>> https://www.retrotronics.org/tmp/dgpsu
>> Hope this helps.
>> On 2019-09-24 01:39, Chris Hanson wrote:
>>> I’ve seen that datageneral.uk at least has a pinout for an Eclipse MV
>>> SCSI port, which hypothetically might match the AViiON DB-50 SCSI.
>>> In the absence of real docs though, who can say?
>>> Can you post the AViiON AV300D power supply pinout you’ve figured out?
>>> Maybe I can power on my system with a couple bench supplies or an ATX
>>> supply...
>>>  — Chris

One time, at band camp -> Re: PBXes at home

[Ethan O'Toole via cctalk]

Hmmm, I think I was confused.  I think the system I saw was a #3 ESS, not a 
#5 ESS.

Jon


Around the 1993 time frame I was at high school band camp for marching 
band. We had an hour or so for lunch, so a friend and myself headed off to 
the nearby Burger King.


Burger King was located next door to a GTE telephone switch facility in 
Chesapeake Virginia. The facility had a parking lot, and maybe a yard 
behind it with the trucks and what not. Lunch happened rapidly, and we 
were talking about the telephone company building.


I had the bright idea that it's also their lunch time, and if we stand in 
front of the door -- maybe we could get a tour.


With some 40 minutes to spare of our lunch, we stood in front of the door 
and caught the next employee. We asked about a tour, and she said it 
shouldn't be a problem but she needed to check. She had us wait in the 
entrance area while she checked with the manager.


As I recall the manager wasn't available then, but she said it was fine 
and she could give us a tour. She started off, but then the manager came 
and was able to take over. They were both super friendly.


He took us in his office and abruptly busted out with "Why you boys so 
interested in the phone company?" We explained we had BBS systems and were 
into computers, he seemed to think it was cool.


We got a tour of their DMS-100 switch. My eyes were big everytime I saw a 
modem wired to that puppy, behind the managers back of course. It wasn't 
terribly large, they explained the building used to be full of switch but 
with the modern digital one it was now less than 1/8th of the building and 
the rest of the building became offices. I remember there were the line 
subscriber modules and the newer ones were twice the density of the older 
ones, 32 versus 64 POTS lines IIRC. And the 64 POTS lines module wasn't 
that large. A lot of it was the copper wiring frames with punchdowns.


The DC power system was awesome, the whole setup was very clean. The 
security was higher than I would have imagined, IIRC the manager had to 
call in before opening the door.


All and all it was pretty cool.

When we were leaving the manager and the lady were waving goodbye and the 
manager said "Have a good onee boys! Please don't sabotoge my switch!"


It was pretty surreal. He knew. How did he know I read phrack magazine 
and ran Tone Loc?! We were 20 minutes late getting back but word had 
gotten back to band director that we were getting a tour of the phone 
company building. He was cool with it.

Timex 16k Ram Expansion on GoodWill auction site

[Bob Yates via cctalk]

https://www.shopgoodwill.com/Item/76238179

Ending today, just saw it

Re: DEC RP04 service manual available

[Noel Chiappa via cctalk]

> From: Evan Koblentz

> I know of two RP04 drives in the wild. One belongs to a private
> collector. VCF has the other.

Right, but does VCF need it scanned?

Oh, one other place that might have one: the MIT MC KL10 had a couple of
RP04's; when it was taken away to Scandanavia, they might have gone with it.
I think that machine is now at LCM?

Noel

Re: DJ11 Maintenance Manual available

[P Gebhardt via cctalk]

Noel, 
there seems to be a copy of the maintenance manual in the unibus-folder on 
bitsavers:
EK-DJ11-MM-003_DJ11_Maint_Man_Aug76.pdf 
Would be worth checking the document revision. 
What is missing, however, is an engineering manual with the schematics.

Best regards,
Pierre

-
http://www.digitalheritage.de






Am Dienstag, 24. September 2019, 18:22:55 MESZ hat Noel Chiappa via cctalk 
 Folgendes geschrieben: 





So, I have a copy of the maintenance manual for the DJ11; is this something
anyone needs?n If so, I'll move it up the scan queue.

      Noel

DJ11 Maintenance Manual available

[Noel Chiappa via cctalk]

So, I have a copy of the maintenance manual for the DJ11; is this something
anyone needs?n If so, I'll move it up the scan queue.

   Noel

Re: PBXes at home

[Jon Elson via cctalk]

On 09/20/2019 11:12 AM, Jon Elson via cctalk wrote:



On 9/19/19 7:27 PM, Ethan O'Toole via cctalk wrote:

Where does one find a working 5ESS for home?



5ESS?  Hmmm, you must have a pretty BIG home, no?
I've had a tour of a 5ESS and it was QUITE big, like 50K 
square feet at least, not counting the battery room and 
the cross connect frames, or the Solar turbine generator.


Jon

Hmmm, I think I was confused.  I think the system I saw was 
a #3 ESS, not a #5 ESS.


Jon

Re: Cleaning an old keyboard

[Philip Belben via cctalk]

> > On Sep 23, 2019, at 7:24 PM, Kevin Parker via cctalk 
> >  wrote:
> > 
> > I resurrected an old keyboard and mouse I like. Not wishing to gross anyone
> > out but it looks like over time there was a build-up of oil etc from my
> > hands etc and over time being stored away its turned to a really almost hard
> > paste like stuff on both the mouse and keyboard.
> > 
> > I've tried number of agents to clean it off but limited success.
> 
> Are you talking about the key caps?

(de-lurking very briefly)

The following works for me on my several IBM model M keyboards:

Take off keycaps

Tie them securely in a cotton carrier bag

put them in thewashing machine with my clothes (not on a high temperature - 30 
or 40 celcius is good)

dry them

Put them back on.

I did this with two keyboards at once on one occasion, and I still haven't 
sorted out which keys belong to which.  (Labels printed at slightly different 
locations on the key)

Philip.

> 
> An adhesives specialist friend of ours has recommended WD-40 as a slow but 
> safe solvent to take off many adhesives.  You'd want to clean it off 
> carefully afterwards since it leaves a messy residue when it dries (WD-40 is 
> NOT a lubricant even though some cans of the stuff claim it is).

PS I wish people wouldn't say WD40 is not a lubricant.  It is.

The problem is that it is quite a heavy grease - suitable for (say) door hinges 
- but when it comes out of the can it looks like a fine oil, because the 
solvent in which the grease is delivered is actually a penetrating oil.  So 
people use it in applications that need a fine oil, and find that the heavy 
grease doesn't work.

Tek logic analyzer probes available

[Jon Elson via cctalk]

I have 6 Tek logic analyzer probes available.

I have one P6464 pattern generator probe with a message 
about some bad channels (could have been the cable or pat 
gen board, too).


There are 3 X P6452 analysis probes, and 2 X P6451.

Anybody need any of these?

Thanks,

Jon

Re: Help identifying mystery Unibus board

[Jay Jaeger via cctalk]

On 9/24/2019 3:15 AM, Tony Duell via cctalk wrote:
> On Tue, Sep 24, 2019 at 9:13 AM Bill Degnan via cctalk
>  wrote:
>>


 Here's the full board, for reference:

 http://yahozna.dyndns.org/scratch/random/board1.jpeg

 Thanks,
 Josh

>>>
>>> /Mattis
>>>
>>
>> You confirmed it is not Omnibus bd, like a drive bootstrap board?
> 
> I think with that many address switches, a 'vector' switch, the grant
> jumpers and the connector at that end it's Unibus.
> 
> -tony
> 

Assuming UNIBUS...

Looking at the address switches, I see 11 selectable bits out of how
many we don't know.

If at one extreme, the bits start at bit 15 (MSB) [assuming bits 16 and
17 are also 1], then the address of the ports on the board would be
77744X - 77747X - that seems like a lot.  (They might start at bit 17,
but then the space used by the board gets absolutely crazy).

If, on the other extreme, we suppose that the top 4 bits are 17 (along
bit bits 17 and 16), then we get 62 - 63.  That might actually
be possible.

One might continue the exercise one bit at a time between the two to see
if the address lands anywhere "interesting".

62
44
10  Not here (Conflict with CPU registers)
777620  Unlikely (memory management)
777440

A more sure way would be to find the address line to which the first
address switch corresponds.

JRJ

Re: flux to imd

[Mark J. Blair via cctalk]

The list isn’t broken. This thread started off-list, and the Chuck CC’d the 
list late in the thread. 

--
Mark J. Blair 
http://www.nf6x.net

M7821 variants

[Noel Chiappa via cctalk]

So I just discovered that there are three wildly different variants of the
M7821 Interrupt Control card. More here, with images:

http://gunkies.org/wiki/M782_Interrupt_Control

I'll have to dredge around and see if I can find circuit diagrams for them
all; they are wildly different, the -C has many fewer components than
the -B and -D, and the latter has a couple of delay lines.

Noel

PS: Sorry about that dis-directed message to Cindy; not quite sure what
I did wrong there.

Re: Data General AViiON AV300D docs?

[alan--- via cctalk]

I mean to add, that view is looking through the machine not the 
connector.  So with the PSU oriented in it's natural position, that is 
the pinout of the solder pin tails coming up through the PSU PCB or the 
face of the connector on the main board.


Also I never scoped the control pins to figure out their roles.  The 
board and mounting hole dimensions are in the Eagle files.


-Alan

On 2019-09-24 10:27, alan--- via cctalk wrote:

I stuck the files up here for the next few weeks as I don't have a
project page for it yet:

https://www.retrotronics.org/tmp/dgpsu

Hope this helps.


On 2019-09-24 01:39, Chris Hanson wrote:

I’ve seen that datageneral.uk at least has a pinout for an Eclipse MV
SCSI port, which hypothetically might match the AViiON DB-50 SCSI.

In the absence of real docs though, who can say?

Can you post the AViiON AV300D power supply pinout you’ve figured out?
Maybe I can power on my system with a couple bench supplies or an ATX
supply...

  — Chris

Re: Data General AViiON AV300D docs?

[alan--- via cctalk]

I stuck the files up here for the next few weeks as I don't have a 
project page for it yet:


https://www.retrotronics.org/tmp/dgpsu

Hope this helps.


On 2019-09-24 01:39, Chris Hanson wrote:

I’ve seen that datageneral.uk at least has a pinout for an Eclipse MV
SCSI port, which hypothetically might match the AViiON DB-50 SCSI.

In the absence of real docs though, who can say?

Can you post the AViiON AV300D power supply pinout you’ve figured out?
Maybe I can power on my system with a couple bench supplies or an ATX
supply...

  — Chris

RE: sa...@elecplus.com

[Electronics Plus via cctalk]

There is an entire process I go through. Paintbrush and vacuum for removing
loose debris. Various cleaners. Ultrasonic cleaner for the caps. It can take
over an hour to really get one looking new again.

-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Noel
Chiappa via cctalk
Sent: Tuesday, September 24, 2019 9:08 AM
To: cctalk@classiccmp.org
Cc: j...@mercury.lcs.mit.edu
Subject: sa...@elecplus.com 

Re: Cleaning an old keyboard
Hey, that spiel would be a good start to a great article on the CHWiki,
'Cleaning keyboards'! (Not sure if any of the other replies contained
anything worth picking up.)

Noel


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sa...@elecplus.com

[Noel Chiappa via cctalk]

Re: Cleaning an old keyboard
Hey, that spiel would be a good start to a great article on the CHWiki,
'Cleaning keyboards'! (Not sure if any of the other replies contained
anything worth picking up.)

Noel

RE: Vintage Computer Warehouse Liquidation

[Electronics Plus via cctalk]

Computer Reset was in Dallas. This one is in Houston. Totally different
animal.

-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Jules
Richardson via cctalk
Sent: Tuesday, September 24, 2019 6:34 AM
To: cctalk@classiccmp.org
Subject: Re: Vintage Computer Warehouse Liquidation

On 9/22/19 2:40 PM, Thomas Raguso via cctalk wrote:
> This is my first of many posts that I will make about this sale.

Is there any connection to Computer Reset in Dallas, or is this a 
completely different animal?


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Re: Vintage Computer Warehouse Liquidation

[Jules Richardson via cctalk]

On 9/22/19 2:40 PM, Thomas Raguso via cctalk wrote:

This is my first of many posts that I will make about this sale.


Is there any connection to Computer Reset in Dallas, or is this a 
completely different animal?

RE: Cleaning an old keyboard

[Electronics Plus via cctalk]

You don't say what brand of keyboard and mouse you have. Some companies
(Logitech is famous for this) used a type of plastic that turns gummy over
the years. The solution for this is to use a thick paste of baking soda and
water, and lots of elbow grease, to remove the gummy stuff. Afterwards,
rinse well with water and dry thoroughly. Regular grime that has accumulated
over the years can be removed with detergent and warm water. Don't exceed
120F on the water temp, as some thin ABS plastics will start to warp at
higher temps. Melted rubber feet, adhesive from tapes and stickers, etc. can
be safely removed with Spot Shot (available at most stores like WalMart in
the carpet cleaning section). I DON'T recommend using the dishwasher. Caps
can be removed and soaked in mild solution of hand dish soap and warm water
for about 30 minutes. Rub them with a rough terry wash cloth, and rinse
thoroughly. Lay them out face up on a towel and blot dry to prevent hard
water spots. The case can be disassembled and cleaned by soaking in the same
manner. Isopropyl will dissolve some plastics, as will acetone and MEK. If
in doubt, use a cotton swab to dab a small amount of the underside of the
case or cap, and wait a few seconds. If the plastic becomes gummy, do not
use that chemical. Note that cases and keycaps are often made from different
types of plastics. GooGone also removes adhesives safely from most plastics.
Do NOT use GoofOff, as it will dissolve almost all types of plastic from
which keyboards are made. If used carefully, a Magic Eraser and water can go
a long ways towards cleaning scuff marks and other heavy residue. Do not use
one dry; it must be damp.

Hope this helps.

Cindy

-Original Message-
From: cctalk [mailto:cctalk-boun...@classiccmp.org] On Behalf Of Kevin
Parker via cctalk
Sent: Monday, September 23, 2019 6:25 PM
To: 'General Discussion: On-Topic and Off-Topic Posts'
Subject: Cleaning an old keyboard

I resurrected an old keyboard and mouse I like. Not wishing to gross anyone
out but it looks like over time there was a build-up of oil etc from my
hands etc and over time being stored away its turned to a really almost hard
paste like stuff on both the mouse and keyboard.

I've tried number of agents to clean it off but limited success.

Any tips please.

Kevin Parker



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Re: Update: Received my 50lb Datapoint 2200 computer from Austria via regular post.

[jos via cctalk]

On 23.09.19 23:36, steven stengel via cctalk wrote:

First, I have to rewire it from 220vac to 110vac.


Lucky you, I would have driven over if had known about it ! Only a one-day 
return trip for me

Be carefully : some parts on the big cooling block are directly connected to 
mains.


Second - what to do about that screen?


Repair / clean it of course. This is what I did to my DP1100 :

Before : ftp://ftp.dreesen.ch/Datapoint/Pictures/Console/CPU_before.jpg

During : 
ftp://ftp.dreesen.ch/Datapoint/Pictures/Console/Pull_off_remaining_goo.jpg

Result  : ftp://ftp.dreesen.ch/Datapoint/Pictures/Console/CPU_after.jpg

.. and the full machine, in its orginal Datapoint desk :

ftp://ftp.dreesen.ch/Datapoint/Pictures/Datapoint_1100.jpg



Jos

Re: Help identifying mystery Unibus board

[Tony Duell via cctalk]

On Tue, Sep 24, 2019 at 9:15 AM Tony Duell  wrote:
>
> On Tue, Sep 24, 2019 at 9:13 AM Bill Degnan via cctalk
>  wrote:
> >
> > > >
> > > >
> > > > Here's the full board, for reference:
> > > >
> > > > http://yahozna.dyndns.org/scratch/random/board1.jpeg
> > > >
> > > > Thanks,
> > > > Josh
> > > >
> > >
> > > /Mattis
> > >
> >
> > You confirmed it is not Omnibus bd, like a drive bootstrap board?
>
> I think with that many address switches, a 'vector' switch, the grant
> jumpers and the connector at that end it's Unibus.
>
> -tony

Re: Help identifying mystery Unibus board

[Tony Duell via cctalk]

On Tue, Sep 24, 2019 at 9:13 AM Bill Degnan via cctalk
 wrote:
>
> > >
> > >
> > > Here's the full board, for reference:
> > >
> > > http://yahozna.dyndns.org/scratch/random/board1.jpeg
> > >
> > > Thanks,
> > > Josh
> > >
> >
> > /Mattis
> >
>
> You confirmed it is not Omnibus bd, like a drive bootstrap board?

I think with that many address switches, a 'vector' switch, the grant
jumpers and the connector at that end it's Unibus.

-tony

Re: Help identifying mystery Unibus board

[Bill Degnan via cctalk]

> >
> >
> > Here's the full board, for reference:
> >
> > http://yahozna.dyndns.org/scratch/random/board1.jpeg
> >
> > Thanks,
> > Josh
> >
>
> /Mattis
>

You confirmed it is not Omnibus bd, like a drive bootstrap board?
B

>

Re: Help identifying mystery Unibus board

[Mattis Lind via cctalk]

Den tis 24 sep. 2019 kl 09:11 skrev Josh Dersch via cctalk <
cctalk@classiccmp.org>:

> Hi all --
>
> Found this in a stack of boards, and I don't know what it is, other than
> that it's Unibus -- there's a logo but no text identifying the board or the
> manufacturer.  Anyone recognize the logo in this picture?
>
> http://yahozna.dyndns.org/scratch/random/board0.jpeg



System Industries?



>
>
> Here's the full board, for reference:
>
> http://yahozna.dyndns.org/scratch/random/board1.jpeg
>
> Thanks,
> Josh
>

/Mattis

Help identifying mystery Unibus board

[Josh Dersch via cctalk]

Hi all --

Found this in a stack of boards, and I don't know what it is, other than
that it's Unibus -- there's a logo but no text identifying the board or the
manufacturer.  Anyone recognize the logo in this picture?

http://yahozna.dyndns.org/scratch/random/board0.jpeg

Here's the full board, for reference:

http://yahozna.dyndns.org/scratch/random/board1.jpeg

Thanks,
Josh

Re: Update: Received my 50lb Datapoint 2200 computer from Austria via regular post.

[Holm Tiffe via cctalk]

Ethan Dicks via cctalk wrote:

> On Mon, Sep 23, 2019 at 4:36 PM steven stengel via cctalk
>  wrote:
> > Found a Datapoint 2200 in Austria that I wanted - I asked seller Viktor to 
> > pack it well, by wrapping it several times in big-bubble bubbewrap, until 
> > it was just a giant cube of bubble wrap.
> 
> Looks like it was worth it.
> 
> > See pics here:
> > http://oldcomputers.net/box/
> 
> > Second - what to do about that screen?
> 
> As someone pointed out, that looks like "CRT cataracts" - where the
> PVA layer between the face of the CRT and the implosion field breaks
> down.  I've had to fix DEC terminals with this condition (and others
> here have had similar experiences on certain devices).  There are ways
> to get the protective glass off the front.  I used a wire to slice
> through the PVA.  Others have reported using heat guns to soften the
> PVA.  In the case of the VT220, I needed to put the glass back after
> cleaning both surfaces because just the CRT along wasn't thick enough
> to fit in the bezel with the original mounting technique.  It did
> depend on the PVA layer.  I found some 3M Silicone Tape (3M VHB Tape
> 4910?) that was clear and 1mm thick.  I just put squares on the
> corners but it would likely work if you edged the entire area to keep
> dust out of the space between.
> 
> I know DEC VT220s and VR201s are prone to this condition and I believe
> I've read about ADM 3A terminals with the same.  Some terminals use
> bare CRTs (thicker face glass, or just manufactured to older
> standards?)
> 
> -ethan

Just a comment.. such picture tubes with the PVA layer seem to be
completely unusual in the former eastern block countires.
They all used tubes with thick fron glass for implosion protection.

Regards,
Holm
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