On 10/14/2015 11:46 AM, tony duell wrote:
[Versatec paper feed motors]
Yes, absolutely, on the Versatec 1200A. I put those motors
in a milling machine. Big, round case stepper motors, with
a ghastly resistor-transistor drive.
You've got me worried now...
I have V80. Actually, it's ICL-badg
[Versatec paper feed motors]
> Yes, absolutely, on the Versatec 1200A. I put those motors
> in a milling machine. Big, round case stepper motors, with
> a ghastly resistor-transistor drive.
You've got me worried now...
I have V80. Actually, it's ICL-badged, and has a GPIB adapter board at th
On 10/14/2015 09:00 AM, Paul Koning wrote:
On Oct 13, 2015, at 11:27 PM, Jon Elson wrote:
...
Yes, I had a bunch of Versatec 1200A's with the Tektronix hard copy feature.
the Versatec was the greatest graphics printer until laser printers came out,
then they became instant boat anchors. H
On 10/14/2015 08:55 AM, tony duell wrote:
Was it a stepper motor? I am sure mine uses a permanent magnet
DC motor. I do remember that the paper feed roller is in 2 parts
with a differential gear between them.
Yes, absolutely, on the Versatec 1200A. I put those motors
in a milling machine. Bi
> On Oct 13, 2015, at 11:27 PM, Jon Elson wrote:
>
>>> ...
> Yes, I had a bunch of Versatec 1200A's with the Tektronix hard copy feature.
> the Versatec was the greatest graphics printer until laser printers came out,
> then they became instant boat anchors. Here's the process.
>
> ... And
> Yes, I had a bunch of Versatec 1200A's with the Tektronix
> hard copy feature. the Versatec was the greatest graphics
> printer until laser printers came out, then they became
> instant boat anchors. Here's the process.
Only in the sense that a PDP11, or a VAX, or a PERQ, or
a is a boatanc
> On Oct 13, 2015, at 11:02 PM, Paul Anderson wrote:
>
> Do you remember Carrol Touch terminals made in the area? I just picked up 2
> still in the box!
Really? PLATO terminals? Or some other kind? I have a Carroll PLATO terminal
at home. If you have one, you can connect it to the cyber1 P
On Oct 13, 2015, at 1:22 PM, tony duell wrote:
The Versatec electrostatic plotters are not the same as the VT52
printer, they are
yet another process. WIth those the paper passes between a set of
electrodes that
build up a charge image on the paper. I beleive the paper is specially
treate
Do you remember Carrol Touch terminals made in the area? I just picked up 2
still in the box!
On Tue, Oct 13, 2015 at 1:32 PM, Paul Koning wrote:
>
> > On Oct 13, 2015, at 1:22 PM, tony duell wrote:
> >
> > The Versatec electrostatic plotters are not the same as the VT52
> printer, they are
> >
> On Oct 13, 2015, at 12:39 , tony duell wrote:
>
> [Aluminium coated paper printers]
>
>> Even Radio Shack had one of those! But not for long. Crumpling the paper
>
> How did the original TRS-80 screen printer work -- the one that plugged into
> the
> expanison bus and read out video RAM?
[Aluminium coated paper printers]
> Even Radio Shack had one of those! But not for long. Crumpling the paper
How did the original TRS-80 screen printer work -- the one that plugged into
the
expanison bus and read out video RAM?
The 'Quick Print II' (or some very similar name) was a Radio Sha
I had a little Comprint printer in the 1970s/1980s that used something
sort of like this. The paper was aluminum coated, thus conductive. The
On Tue, 13 Oct 2015, tony duell wrote:
That is how the Sinclair ZX printer works and also things like the Axiom
EX820. Spark (about 80-100V IIRC) to al
On 10/13/2015 11:43 AM, Brent Hilpert wrote:
TMK these were generally referred to as electrographic printing.
This sort of scheme goes back to at least the 40/50s for fax
machines: http://www.cs.ubc.ca/~hilpert/e/deskfax/index.html There
the metalisation is on the back of the paper.
Similar te
On 2015-Oct-13, at 8:25 AM, Paul Koning wrote:
>> On Oct 13, 2015, at 11:19 AM, Jay Jaeger wrote:
>> On 10/13/2015 12:02 AM, tony duell wrote:
>>> ...
>>> It appears to be electrolytic. You have to keep the paper damp (there is a
>>> wick
>>> inside that you put water on. The paper goes between a
> On Oct 13, 2015, at 1:22 PM, tony duell wrote:
>
> The Versatec electrostatic plotters are not the same as the VT52 printer,
> they are
> yet another process. WIth those the paper passes between a set of electrodes
> that
> build up a charge image on the paper. I beleive the paper is special
> That sounds correct. Versatec made printers that used that process, I used
> one
> (attached to the CDC 6500 at U of Illinois PLATO). Very nice for continuous
> roll
> full bitmap graphics.
The Versatec electrostatic plotters are not the same as the VT52 printer, they
are
yet another proc
OK here it is The paper is impregnated with potassium ferrocyanide. This
gives a yellowish color.
The paper is dampend to make it conductive. Passing a current through it
turns it blue (at least in the reference I saw)
I always thought it printed black.
Rod Smallwood
On 13/10/2015 17:20, Paul
On Tue, Oct 13, 2015 at 11:52 AM, tony duell wrote:
>> The only other terminal I worked
>> with that could do that was a Tektronix storage scope terminal (4010
>> or 4014, IIRC)
> IIRC the image was developed by heating the paper. I don't remember any
> liquids involved, but it's been a long time
On 2015-10-13 18:20, Paul Koning wrote:
On Oct 13, 2015, at 12:13 PM, Mark J. Blair wrote:
On Oct 12, 2015, at 23:42, Ethan Dicks wrote:
On Mon, Oct 12, 2015 at 11:32 PM, Nigel Williams
wrote:
Has anyone ever seen one? I had an idea it used a silvered-paper and
burned it off? or am I mi
> On Oct 13, 2015, at 12:13 PM, Mark J. Blair wrote:
>
>
>> On Oct 12, 2015, at 23:42, Ethan Dicks wrote:
>>
>> On Mon, Oct 12, 2015 at 11:32 PM, Nigel Williams
>> wrote:
>>> Has anyone ever seen one? I had an idea it used a silvered-paper and
>>> burned it off? or am I mis-remembering.
>>
> On Oct 12, 2015, at 23:42, Ethan Dicks wrote:
>
> On Mon, Oct 12, 2015 at 11:32 PM, Nigel Williams
> wrote:
>> Has anyone ever seen one? I had an idea it used a silvered-paper and
>> burned it off? or am I mis-remembering.
>
> I used one in the early 1980s but I never had to repair it. It w
> On Oct 13, 2015, at 11:52 AM, tony duell wrote:
>
>> The only other terminal I worked
>> with that could do that was a Tektronix storage scope terminal (4010
>> or 4014, IIRC). The Tek printer wasn't built-in, but it did take a
>> scan of the live screen, so that was similar. The paper was
>
>
>
> I had a little Comprint printer in the 1970s/1980s that used something
> sort of like this. The paper was aluminum coated, thus conductive. The
> head was a high voltage electrode unit that burned away the aluminum
> layer. (I can't imagine any kind of deposition technology in that
> era..
-Oorspronkelijk bericht-
From: Nigel Williams
Sent: Tuesday, October 13, 2015 12:32 PM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: VT52s, VT61s lots of DEC and DG keyboards- return trip through
Maine, MA, NY, PA, OH, IN to IL
On 13 Oct 2015, at 7:15 PM, Rod
> The only other terminal I worked
> with that could do that was a Tektronix storage scope terminal (4010
> or 4014, IIRC). The Tek printer wasn't built-in, but it did take a
> scan of the live screen, so that was similar. The paper was
> silver-grey and I remember it coming out wet too. Everyth
On Tue, Oct 13, 2015 at 11:25 AM, Paul Koning wrote:
> There are all sorts of oddball printing technologies from back then. I
> remember
> one (from a lab instrument, not a printer or terminal) that used
> aluminum-coated
> paper, but the coating was on the back of the paper. The writing was d
> On Oct 13, 2015, at 11:19 AM, Jay Jaeger wrote:
>
> On 10/13/2015 12:02 AM, tony duell wrote:
>>
>> ...
>> It appears to be electrolytic. You have to keep the paper damp (there is a
>> wick
>> inside that you put water on. The paper goes between a helical electrode on
>> a spinning drum and
On 10/13/2015 12:02 AM, tony duell wrote:
>
>>
>> Paul, if you come across any VT52s that have the built-in screen
>> printer could you take some pictures please.
>>
>> Has anyone ever seen one? I had an idea it used a silvered-paper and
>> burned it off? or am I mis-remembering.
>
> I have one.
> On 13 Oct 2015, at 7:15 PM, Rod Smallwood
> wrote:
> Its called a Hellschreiber http://
> www.nonstopsystems/radio/pdf-hell/hell-g5xb.pdf
Fixed URL:
http://www.nonstopsystems.com/radio/pdf-hell/hell-g5xb.pdf
Its called a Hellschreiber http://
www.nonstopsystems/radio/pdf-hell/hell-g5xb.pdf
Regards Rod
On 13/10/2015 06:20, Nigel Williams wrote:
Thanks Jos, Tony and Rod - you've neatly highlighted why I found the
screen printer so curious and fascinating, an oddball feature in the
terminal world and
I remember getting a laugh at one product training. I got asked to name
a unique feature of the VT52.
My answer "Built in toilet paper dispenser"
On 13/10/2015 06:20, Nigel Williams wrote:
Thanks Jos, Tony and Rod - you've neatly highlighted why I found the
screen printer so curious and fascina
On Mon, Oct 12, 2015 at 11:32 PM, Nigel Williams
wrote:
> Has anyone ever seen one? I had an idea it used a silvered-paper and
> burned it off? or am I mis-remembering.
I used one in the early 1980s but I never had to repair it. It was,
as Tony and others have mentioned, electrolytic, not therma
Thanks Jos, Tony and Rod - you've neatly highlighted why I found the
screen printer so curious and fascinating, an oddball feature in the
terminal world and seemingly a simple mechanism to render the screen.
If anyone with access to one has the interest and time I'd appreciate
pictures and any add
The VT52 printer used a very odd system. A spiral wire on a drum sat on
one side of the paper and the other a sraight edge.
So you could scan a line at a time. The paper must have been treated
with something or other.
A great project for somebody to try and make. Very simple mechanics, One
tur
>
> Paul, if you come across any VT52s that have the built-in screen
> printer could you take some pictures please.
>
> Has anyone ever seen one? I had an idea it used a silvered-paper and
> burned it off? or am I mis-remembering.
I have one. Well, in a VT55, but that is a VT52 with a graph-plot
On 13.10.2015 05:32, Nigel Williams wrote:
On Tue, Oct 13, 2015 at 2:16 PM, Paul Anderson wrote:
I picked up a few of the VT52s today and they looked pretty good.
Paul, if you come across any VT52s that have the built-in screen
printer could you take some pictures please.
Has anyone ever see
On 10/12/2015 10:32 PM, Nigel Williams wrote:
On Tue, Oct 13, 2015 at 2:16 PM, Paul Anderson wrote:
I picked up a few of the VT52s today and they looked pretty good.
Paul, if you come across any VT52s that have the built-in screen
printer could you take some pictures please.
Has anyone ever s
no, sounds like your memory is working better than mine.
He thinks he has one with a printer and I will try to grab it.
On Mon, Oct 12, 2015 at 11:32 PM, Nigel Williams <
n...@retrocomputingtasmania.com> wrote:
> On Tue, Oct 13, 2015 at 2:16 PM, Paul Anderson wrote:
> > I picked up a few of the
On Tue, Oct 13, 2015 at 2:16 PM, Paul Anderson wrote:
> I picked up a few of the VT52s today and they looked pretty good.
Paul, if you come across any VT52s that have the built-in screen
printer could you take some pictures please.
Has anyone ever seen one? I had an idea it used a silvered-paper
I picked up a few of the VT52s today and they looked pretty good. A little
yellow, no burns on screen, nice keyboards. I'll be picking up more later
this week.\\
On Fri, Oct 9, 2015 at 11:31 PM, Paul Anderson wrote:
> I'll be picking up a huge lot of DEC and some DG keyboards( no part
> number
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