[GreenKeys] Interesting modified teletype

[Duncan Brown]

CRTs were also used as early A/D converters

See  https://www.youtube.com/watch?v=ywy6xXjwgmI

Have fun,

Duncan

K2OEQ


On 30-Mar-24 10:27, John Spigel wrote:
> Interesting stuff. Looks like the work predates 8 bit machines.
> I remember years ago when bits and sometimes piles of the tube plugins 
> of the old computers would show up surplus. I definitely was surprised 
> that arrays of small CRTs were used as memory storage. It shows how 
> clever you had to be to solve problems back then. And I wonder how 
> much beer you had with colleagues to find those solutions and the lab 
> experiments performed to verify and limit the risks. I'm sure it was a 
> fun job. Military? Who has that story?
> Should this history be preserved and part of the education for new IT 
> professionals?
>
> 73, John W1AN
>
> On 30-Mar-24 08:36, E. wrote:
>> Man would I love to tear those apart to see how they work!
>>
>> …so that is - like John said, is a heavily modified M19 (the 
>> non-standard keys are really interesting too) with a standard-ish 
>> punch — missing the dial and all (but with other goods)… and then it 
>> feeds into that modified half-a 14TD (the verifier or whatever they 
>> call it… it has the front end of a 14TD, but not the innards on the 
>> back).  The tape then goes into what looks like a gutted M14 that has 
>> a (standard?) M19 tape punch on the inside (the duplicator)?
>>
>> Also interesting is that when they show the M19 from the side, it 
>> looks like they have a cut-out backdrop (where the tape goes), to 
>> hide whatever is behind the 19 (top secret maybe?).
>>
>> It does almost look like a standard M19 metal table, but again 
>> modified.  That half of a 14TD looks to be propped up on a piece of 
>> wood, so that the tape spool can sit in front of it (usually a 
>> standard 14TD would take up most of that space).
>>
>> Also curious is the piece of metal that skews towards the camera when 
>> the 19 is shown from the side.
>>
>>
>>> On Mar 30, 2024, at 12:08 AM, John, W9DDD <w9ddd at tapr.org> wrote:
>>>
>>> Interesting,
>>>
>>> Heavily modified 19 keyboard punch (technically called "Model 15 
>>> Perforator Transmitter").  Looks like they're punching hexadecimal 
>>> onto a 5 bit tape.   The character counter has some extra switches.
>>>
>>> Not a standard 14 TD (maybe MXD?) so not a 19 table per se. Looks to 
>>> be 19 size, but without the 14tD base.
>>>
>>>
>>> On 3/29/2024 11:17 PM, Paul Heller wrote:
>>>> 
>>>> About 8:30 in the video. Model 19?
>>>>
>>>> https://www.youtube.com/watch?v=aAVT4rZbcGE
>>>>
>>>> Paul
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