[GreenKeys] Interesting modified teletype

Sat Mar 30 13:13:48 EDT 2024

Duncan, I am now more amazed after viewing the youtube.
I wish I knew about all this stuff as a kid.

BTW, there is a good book I just found as a reprint from Amazon that 
covers electricity and communications back as far as 1800. I highly 
recommend. My copy is an original from 1890. "Electricity in Daily 
Life." Good reading.  Covers all sorts of transportation, telegraphy, 
printing telegraphy, lighting, transatlantic cable laying, etc.. Did you 
know we had wireless telegraphy with moving trains and ships before 
1890? Of course they didn't know what radio was then.

73, John W1AN

On 30-Mar-24 15:44, Duncan Brown wrote:
> 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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>
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