Re: Slashed letter O, unslashed letter zero

[ben via cctalk]

On 2022-04-28 6:03 p.m., Paul Koning via cctalk wrote:

 It almost feels like a web page version of Lindsay Publishing, sadly gone now.

paul


Here is link for RETRO mechanical things off YouTube, to fill that need 
to build.


Machining The Antikythera Mechanism
Antikythera Fragments

https://www.youtube.com/c/Clickspring/featured

Ben.

Re: RT11 Freeware Collection

[s shumaker via cctalk]

duh...  Didn't look there.  was googling all over w/o success.  It 
didn't show the bitsavers link.  Thanks!


Steve

On 4/28/2022 7:55 PM, Douglas Taylor via cctalk wrote:

Here is the link I used:

http://www.bitsavers.org/bits/DEC/pdp11/trailing-edge_cd/rt11freewarev2.iso.gz 



Doug

On 4/28/2022 5:35 PM, s shumaker via cctalk wrote:

Can you post the download link for the ISO?

Steve

On 4/27/2022 7:46 AM, Douglas Taylor via cctalk wrote:

All;

I wanted to extract some parts of the RT11 Freeware iso file that is 
available on the internet.  The note Tom Shoppa wrote indicates that 
the CD has 2 partitions.  When I burned the CD on a windows machine 
I only see one partition.


How to I extract the 2nd partition off the iso?

Doug

Re: RT11 Freeware Collection

[Douglas Taylor via cctalk]

Here is the link I used:

http://www.bitsavers.org/bits/DEC/pdp11/trailing-edge_cd/rt11freewarev2.iso.gz

Doug

On 4/28/2022 5:35 PM, s shumaker via cctalk wrote:

Can you post the download link for the ISO?

Steve

On 4/27/2022 7:46 AM, Douglas Taylor via cctalk wrote:

All;

I wanted to extract some parts of the RT11 Freeware iso file that is 
available on the internet.  The note Tom Shoppa wrote indicates that 
the CD has 2 partitions.  When I burned the CD on a windows machine I 
only see one partition.


How to I extract the 2nd partition off the iso?

Doug

Re: Slashed letter O, unslashed letter zero

[Paul Koning via cctalk]

> On Apr 26, 2022, at 1:25 PM, Shoppa, Tim via cctalk  
> wrote:
> 
> Paul writes:
>> As for the slashed letter O, that's strange.  Certainly it is not CDC 
>> practice; the only place I ever ran into this is with IBM, I always 
>> considered it an example of IBM doing
>> things the weird way.  So it sounds like whoever bought those Teletype 
>> machines had them configured in that non-standard way for some reason.  
>> Normal, as far as I know, was slashed digit zero.
> 
> Slashed letter O, unslashed zero was by far the most common configuration for 
> Model 33 Teletypes sold/leased through Telex / Dataphone providers. My 
> surplus TTY experience from the early 1980's heavily turned up Model 33's 
> with slashed letter O's.
> 
> If you bought a Model 33 through DEC, it almost certainly would've come with 
> a slashed zero and unslashed letter O.

Indeed.  But my first exposure to computers was in Holland, where the 
Flexowriters certainly didn't come with slashed letter O.  Nor the Selectric 
console on the Philips PR8000, or the line printer output.  I never ran into a 
slashed O until I was amazed to see one on some IBM system.

Curious that it would be "the most common configuration" on model 33s.

> I'm 99% sure I've seen a listing of various Model 33 type-cylinder choices on 
> some greenkeys site. Maybe it's in one of my paper Teletype manuals. Most are 
> at least related to ASCII but there were a handful that were really "out 
> there" (weather symbols, etc.) and seemed to have nothing to do with ASCII 
> except they skipped the first 32 characters as unprintables.

If it has weather symbols, it might be a 6-bit machine.  Up to the 1970s or so, 
"wire service" links connecting to newspapers to carry AP news and stock market 
info and the like were normally 6 bit, typesetting machine coding or something 
rather similar.  But the actual code depended on the service: upper/lower case 
text for news wire, lots of fractions for stock listings, and clouds and 
lightning bolts and such stuff for the weather wire.

> This website has a history of slashing the letter O (and also ticked, 
> center-dotted, etc.) oriented around computing: 
> https://circuitousroot.com/artifice/letters/characters/slashed-o/index.html

Wow, there is a lot of wonderful stuff on that site!  It almost feels like a 
web page version of Lindsay Publishing, sadly gone now.

paul

Re: cleaning up edge connectors

[Jonathan Chapman via cctalk]

If there's bad/deep corrosion, I hit it with the ink eraser (I have a bunch of 
Eberhard-Faber ones that look like a wooden pencil, you sharpen them like a 
pencil too). If that won't touch it, I use the stainless steel toothbrush.

Corey Cohen has some plating solution that you dip a pen in, intended for 
jewelry repair. The plating does not hold up well over copper, you need a layer 
of nickel over the copper first. So, if you're removing down to the copper, 
you'll have to find a way to put nickel on first.

Thanks,
Jonathan




--- Original Message ---
On Thursday, April 28th, 2022 at 15:47, Bill Gunshannon via cctalk 
 wrote:


>
>
>
> I am hoping to restore my TRS-80 Model-I(s). As is usually
> the case with these the edge connectors are badly corroded
> and dirty and cleaning them with an eraser really doesn't
> help much. Back in the day there used to be something you
> could get that let you "gold plate" the edge connectors.
> Is anything like that still available? How about reflowing
> the pads using something like silver solder?
> If neither of these is doable or practical, what are people
> doing to clean up these connectors?
>
> bill

Re: cleaning up edge connectors

[Chuck Guzis via cctalk]

On 4/28/22 13:56, John Foust via cctalk wrote:

> Not cheap but they are out there.
> 
> https://www.goldplating.com/collections/jewelry-plating-kits
> 
> I had a similar set of jars of metal salts for plating 40+ years ago.
> 
> - John


Another favorite place for plating supplies:

https://caswellplating.com

--Chuck

Re: cleaning up edge connectors

[Mike Katz via cctalk]

I use DeOxit Gold to clean my PDP-8 boards edge conectors:

https://www.amazon.com/G5S-6-Enhancer-Protector-Surfaces-Integrated/dp/B003A7KHK8

On 4/28/2022 4:53 PM, geneb via cctalk wrote:

On Thu, 28 Apr 2022, Bill Gunshannon via cctalk wrote:



I am hoping to restore my TRS-80 Model-I(s).  As is usually
the case with these the edge connectors are badly corroded
and dirty and cleaning them with an eraser really doesn't
help much.  Back in the day there used to be something you
could get that let you "gold plate" the edge connectors.
Is anything like that still available?  How about reflowing
the pads using something like silver solder?
If neither of these is doable or practical, what are people
doing to clean up these connectors?


Bill, you might want to look into these: (quantities assume you're 
also working with an Expansion Interface)


40 pin - you'll need 3:
https://www.elliottelectronicsupply.com/connectors/card-edge/male-card-edge-connector-40-position-1-inch-2-54mm-solder-eyelet-double-readout.html 



34 pin - you'll need 2:
https://www.elliottelectronicsupply.com/connectors/card-edge/male-card-edge-connector-34-position-1-inch-2-54mm-solder-eyelet-double-readout.html 



I found them while tracking down a replacement for one on a Model I 
that had been severely damaged.


g.

Re: cleaning up edge connectors

[geneb via cctalk]

On Thu, 28 Apr 2022, Bill Gunshannon via cctalk wrote:



I am hoping to restore my TRS-80 Model-I(s).  As is usually
the case with these the edge connectors are badly corroded
and dirty and cleaning them with an eraser really doesn't
help much.  Back in the day there used to be something you
could get that let you "gold plate" the edge connectors.
Is anything like that still available?  How about reflowing
the pads using something like silver solder?
If neither of these is doable or practical, what are people
doing to clean up these connectors?


Bill, you might want to look into these: (quantities assume you're also 
working with an Expansion Interface)


40 pin - you'll need 3:
https://www.elliottelectronicsupply.com/connectors/card-edge/male-card-edge-connector-40-position-1-inch-2-54mm-solder-eyelet-double-readout.html

34 pin - you'll need 2:
https://www.elliottelectronicsupply.com/connectors/card-edge/male-card-edge-connector-34-position-1-inch-2-54mm-solder-eyelet-double-readout.html

I found them while tracking down a replacement for one on a Model I that 
had been severely damaged.


g.

--
Proud owner of F-15C 80-0007
http://www.f15sim.com - The only one of its kind.
http://www.diy-cockpits.org/coll - Go Collimated or Go Home.
Some people collect things for a hobby.  Geeks collect hobbies.

ScarletDME - The red hot Data Management Environment
A Multi-Value database for the masses, not the classes.
http://scarlet.deltasoft.com - Get it _today_!

Re: RT11 Freeware Collection

[s shumaker via cctalk]

Can you post the download link for the ISO?

Steve

On 4/27/2022 7:46 AM, Douglas Taylor via cctalk wrote:

All;

I wanted to extract some parts of the RT11 Freeware iso file that is 
available on the internet.  The note Tom Shoppa wrote indicates that 
the CD has 2 partitions.  When I burned the CD on a windows machine I 
only see one partition.


How to I extract the 2nd partition off the iso?

Doug

Re: cleaning up edge connectors

[Peter Cetinski via cctalk]

> On Apr 28, 2022, at 3:47 PM, Bill Gunshannon via cctalk 
>  wrote:
> 
> 
> I am hoping to restore my TRS-80 Model-I(s).  As is usually
> the case with these the edge connectors are badly corroded
> and dirty and cleaning them with an eraser really doesn't
> help much.  Back in the day there used to be something you
> could get that let you "gold plate" the edge connectors.
> Is anything like that still available?  How about reflowing
> the pads using something like silver solder?
> If neither of these is doable or practical, what are people
> doing to clean up these connectors?
> 
> bill

TRS-80 guru Ian Mavric sells those gold connectors for the TRS-80.

https://www.ebay.com/itm/164568343523 

Re: cleaning up edge connectors

[John Foust via cctalk]

At 03:45 PM 4/28/2022, Bill Gunshannon via cctalk wrote:
>>>If neither of these is doable or practical, what are people
>>>doing to clean up these connectors?
>>Anent that, here's an oldie but goldie:
>>https://www.youtube.com/watch?v=vqr-ZmDHR8U
>
>Now that was cool.  But, somehow I doubt it is still available.

Not cheap but they are out there.

https://www.goldplating.com/collections/jewelry-plating-kits

I had a similar set of jars of metal salts for plating 40+ years ago.

- John

Re: cleaning up edge connectors

[Bill Gunshannon via cctalk]

On 4/28/22 16:32, Chuck Guzis via cctalk wrote:

On 4/28/22 12:47, Bill Gunshannon via cctalk wrote:


I am hoping to restore my TRS-80 Model-I(s).  As is usually
the case with these the edge connectors are badly corroded
and dirty and cleaning them with an eraser really doesn't
help much.  Back in the day there used to be something you
could get that let you "gold plate" the edge connectors.
Is anything like that still available?  How about reflowing
the pads using something like silver solder?
If neither of these is doable or practical, what are people
doing to clean up these connectors?


Anent that, here's an oldie but goldie:

https://www.youtube.com/watch?v=vqr-ZmDHR8U


Now that was cool.  But, somehow I doubt it is still available.

bill

Re: cleaning up edge connectors

[Chuck Guzis via cctalk]

On 4/28/22 12:47, Bill Gunshannon via cctalk wrote:
> 
> I am hoping to restore my TRS-80 Model-I(s).  As is usually
> the case with these the edge connectors are badly corroded
> and dirty and cleaning them with an eraser really doesn't
> help much.  Back in the day there used to be something you
> could get that let you "gold plate" the edge connectors.
> Is anything like that still available?  How about reflowing
> the pads using something like silver solder?
> If neither of these is doable or practical, what are people
> doing to clean up these connectors?

Anent that, here's an oldie but goldie:

https://www.youtube.com/watch?v=vqr-ZmDHR8U

--Chuck

Re: cleaning up edge connectors

[Chris Zach via cctalk]

2000 grit sandpaper?

On 4/28/2022 4:16 PM, Chuck Guzis via cctalk wrote:

On 4/28/22 12:47, Bill Gunshannon via cctalk wrote:


I am hoping to restore my TRS-80 Model-I(s).  As is usually
the case with these the edge connectors are badly corroded
and dirty and cleaning them with an eraser really doesn't
help much.  Back in the day there used to be something you
could get that let you "gold plate" the edge connectors.
Is anything like that still available?  How about reflowing
the pads using something like silver solder?
If neither of these is doable or practical, what are people
doing to clean up these connectors?


Dunno about the gold stuff, but I've occasionally used Cool-Amp:

https://www.cool-amp.com/

--Chuck

Re: cleaning up edge connectors

[Chuck Guzis via cctalk]

On 4/28/22 12:47, Bill Gunshannon via cctalk wrote:
> 
> I am hoping to restore my TRS-80 Model-I(s).  As is usually
> the case with these the edge connectors are badly corroded
> and dirty and cleaning them with an eraser really doesn't
> help much.  Back in the day there used to be something you
> could get that let you "gold plate" the edge connectors.
> Is anything like that still available?  How about reflowing
> the pads using something like silver solder?
> If neither of these is doable or practical, what are people
> doing to clean up these connectors?

Dunno about the gold stuff, but I've occasionally used Cool-Amp:

https://www.cool-amp.com/

--Chuck

cleaning up edge connectors

[Bill Gunshannon via cctalk]

I am hoping to restore my TRS-80 Model-I(s).  As is usually
the case with these the edge connectors are badly corroded
and dirty and cleaning them with an eraser really doesn't
help much.  Back in the day there used to be something you
could get that let you "gold plate" the edge connectors.
Is anything like that still available?  How about reflowing
the pads using something like silver solder?
If neither of these is doable or practical, what are people
doing to clean up these connectors?

bill

Re: Rubber bands for a TU58

[Alan Perry via cctalk]

On 4/28/22 8:21 AM, Christian Corti via cctalk wrote:

On Thu, 28 Apr 2022, Chris Zach wrote:
Quick question: I have seen references to new rubber bands for the 
DC600 series of carts, but is there a similar replacement part for 
TU58 tapes?


Yes, but forget Baumgartens' Plastibands, they are practically 
unavailable.

I got some hundred of each size of Mobilon Bands by Nisshinbo.
Part number MB-9033TA-100G for DC100 size cartridges, and
part number MB-15063WA-100G for the ordinary QIC cartridges.



I am sorry that I bought all of the Plastibands :)

alan

Re: Rubber bands for a TU58

[Christian Corti via cctalk]

On Thu, 28 Apr 2022, Chris Zach wrote:
Quick question: I have seen references to new rubber bands for the DC600 
series of carts, but is there a similar replacement part for TU58 tapes?


Yes, but forget Baumgartens' Plastibands, they are practically 
unavailable.

I got some hundred of each size of Mobilon Bands by Nisshinbo.
Part number MB-9033TA-100G for DC100 size cartridges, and
part number MB-15063WA-100G for the ordinary QIC cartridges.

Christian

Rubber bands for a TU58

[Chris Zach via cctalk]

Quick question: I have seen references to new rubber bands for the DC600 
series of carts, but is there a similar replacement part for TU58 tapes?


C

Lisp machine PCBs

[Liam Proven via cctalk]

A chap I know -- not on the list -- has some old LispM bits that he
would like to find good homes for.

Quote:
«
LISP Machine boards - attached are a couple of pictures of the two
sizes of boards we have. The smaller boards are two ESDI "paddles" and
two console boards. The larger boards are six colour memory boards,
two 512kW memory boards, two NBS FEP-IO boards and a colour controller
board. AFAIK they're all from 3600-series machines. No idea if they
work or not, clearly.

The LISP Machine keyboards we have in the cupboard are 364000 models,
complete with cables.
»

https://drive.google.com/file/d/1BJt5NBYG2YEiiJYJMMYFmQN7TlefU1CW/view?usp=sharing

https://drive.google.com/file/d/1xHAQPuFh4OCW_IGX1V6J1SnE2blNzFPN/view?usp=sharing

I know that the keyboards are seriously valuable (~USD 1500 each at a
guess) but he would prefer that they went to actual LispM owners and
not to random keyboard collectors.

I am looking for pointers to anywhere that I might find such LispM
owners, and anyone who might be interested in the PCBs.

-- 
Liam Proven ~ Profile: https://about.me/liamproven
Email: lpro...@cix.co.uk ~ gMail/gTalk/FB: lpro...@gmail.com
Twitter/LinkedIn: lproven ~ Skype: liamproven
UK: (+44) 7939-087884 ~ Czech [+ WhatsApp/Telegram/Signal]: (+420) 702-829-053

RE: Not just slashed zeroes/ohs

[Dave Wade G4UGM via cctalk]

> -Original Message-
> From: cctalk  On Behalf Of Teo Zenios via
> cctalk
> Sent: 28 April 2022 06:43
> To: Fred Cisin ; General Discussion: On-Topic and Off-
> Topic Posts 
> Subject: Re: Not just slashed zeroes/ohs
> 
> I watched the screen and it works very well. His only problem is he
> sometimes forget to click a button to start the input going. There is a
box
> where what he speaks gets transcribed and then he cuts and pasts it to the
> correct spot in the patients worksheet.
> 
> -Original Message-
> From: Fred Cisin via cctalk
> Sent: Wednesday, April 27, 2022 11:19 PM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: Not just slashed zeroes/ohs
> 
> On Wed, 27 Apr 2022, Teo Zenios via cctalk wrote:
> > One of my mothers doctors just talks into a microphone and it does the
> > typing for him in real time.
> 
> YIKES!
> I hope that he MANUALLY edits the results!
> People that aren't familiar with such OFTEN have excessive confidence that
it
> is getting it right.  When a human transcribes, they filter through
"common
> sense"; people sometimes ASSUME that the dictation program also does so.
> 
> An auto-corrupt could be dangerous.

It could, but I know of a couple of medical folks that use similar
technology. They say it is more accurate than their typing..

Dave
G4UGM