cctalk [cctalk-boun...@classiccmp.org] on behalf of dwight via
> cctalk [cctalk@classiccmp.org]
> Sent: Tuesday, May 9, 2017 4:17 PM
> To: Paul Koning; General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: 110 Baud modem
>
> Rtty was f
> On May 9, 2017, at 4:41 PM, Pete Lancashire wrote:
>
> The relays were from WECO. Made by the millions, they were the ones used in
> all Bell telephone exchanged from the early 50's up to the ESS (electronic)
> exchanges. Remember seeing ones with less then a full compliment of contacts,
>
From: cctalk [cctalk-boun...@classiccmp.org] on behalf of dwight via cctalk
[cctalk@classiccmp.org]
Sent: Tuesday, May 9, 2017 4:17 PM
To: Paul Koning; General Discussion: On-Topic and Off-Topic Posts
Subject: Re: 110 Baud modem
Rtty was fsk. You needed
The relays were from WECO. Made by the millions, they were the ones used
in all Bell telephone exchanged from the early 50's up to the ESS
(electronic) exchanges. Remember seeing ones with less then a full
compliment of contacts, but that was pretty uncommon.
https://archive.org/details/bstj31-6-
Once you convert from Bell to English things make a bit more sense. One has
to have a understanding of analog engineering terms but this oldie pretty
much works the same as any Hayes etc modems.
The Modulator takes digital 1/0 levels and converts to one of two sine wave
frequencies.
The Limiter,
The relays are for controlling the modes function/mode. For example if the
unit is put in local mode, or when an incoming call is "Answered" the motor
will start running.
On Tue, May 9, 2017 at 8:22 AM, Anders Nelson via cctalk <
cctalk@classiccmp.org> wrote:
> Good lord, is that a pile of rela
The BSPs for Data Set 101C
Identification and Operation March 1963 (Issue 2)
Test and Installation Methods May 1967
Locating Trouble and Test Procedures 1964
http://www.samhallas.co.uk/repository/telegraph/data_set_101c.pdf
Answers the questions about the relays
-pete
On Tue, May 9, 2017 a
Wikipedia is wrong a lot of times. Usually in the details.
Modem or MOdulator DEModulator had to come about when one could finally put
a modulator (voltage or current loop) in and get a modulated signal out,
and the reverse, and thirdly all the control circuitry to automate things.
Long before th
It would depend on what you wanted to emulate. The 'logic' you see in the
relays and here
https://goo.gl/photos/4sDv7MGRvknugiAGA
Would be very easy.
The logic is to handle auto answer, carrier detect, motor control, local vs
remote loop etc. All the things
that were miniaturized by Penrill and
The C version came later with the introduction of ASCII ( 5 to 8 bits ) and
110 baud. So it does not go back to the 50's.
I do not know when the C version was released. The ASCII Teletype Model 35
was introduced in 1961.
-pete
On Tue, May 9, 2017 at 6:47 AM, Paul Koning wrote:
>
> > On May
On Tue, May 9, 2017 at 2:58 PM, Brent Hilpert via cctalk
wrote:
> On 2017-May-09, at 9:06 AM, Chuck Guzis via cctalk wrote:
>> Looking at this documents:
>>
>> http://www.samhallas.co.uk/repository/telegraph/data_set_101c.pdf
What a find. Thank you!
> I've looked at one of these modems in the b
> On May 9, 2017, at 4:17 PM, dwight wrote:
>
> Rtty was fsk. You needed a scope or a needle to
> indicate when the BFO was centered.
> That would be tuning.
Bell 101 and 103 modems (and 202 for that matter) are also unclocked FSK.
paul
> On May 9, 2017, at 2:58 PM, Brent Hilpert via cctalk
> wrote:
>
> On 2017-May-09, at 9:06 AM, Chuck Guzis via cctalk wrote:
>> Looking at this documents:
>>
>> http://www.samhallas.co.uk/repository/telegraph/data_set_101c.pdf
>>
>> I sill can't figure out what a lot of the stuff inside is f
From: cctalk on behalf of Paul Koning via
cctalk
Sent: Tuesday, May 9, 2017 7:39:00 AM
To: Pete Lancashire
Cc: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: 110 Baud modem
So Wikipedia is wrong, since it claims that it was introduced in 1958
On 2017-May-09, at 9:06 AM, Chuck Guzis via cctalk wrote:
> Looking at this documents:
>
> http://www.samhallas.co.uk/repository/telegraph/data_set_101c.pdf
>
> I sill can't figure out what a lot of the stuff inside is for.
I've looked at one of these modems in the bottom of a 33 although not e
>> On Tue, May 9, 2017 at 6:47 AM, Paul Koning wrote:
>>> On May 8, 2017, at 10:27 PM, Pete Lancashire via cctalk
>>> wrote:
>>>
>>> Bell 101C
>>>
>>> https://goo.gl/photos/hrhAwvzMBLWWteXu6
>>>
>>> https://en.wikipedia.org/wiki/Bell_101
>>
>> Interesting. Released in 1958 but that unit is
Looking at this documents:
http://www.samhallas.co.uk/repository/telegraph/data_set_101c.pdf
I sill can't figure out what a lot of the stuff inside is for.
--Chuck
Good lord, is that a pile of relays to click out bits rotary-style?
=o
--
Anders Nelson
+1 (517) 775-6129
www.erogear.com
On Tue, May 9, 2017 at 7:39 AM, Paul Koning via cctalk <
cctalk@classiccmp.org> wrote:
> So Wikipedia is wrong, since it claims that it was introduced in 1958 for
> ASCII
So Wikipedia is wrong, since it claims that it was introduced in 1958 for ASCII
and 110 Baud.
Then again, 101/103 modem modulation doesn't care about speed (it isn't
clocked) up to a limit of 300 baud or so.
I wonder if there is also terminology here: what we now call a "modem" was
earlier cal
2017-05-09 15:47 GMT+02:00 Paul Koning via cctalk :
>
> > On May 8, 2017, at 10:27 PM, Pete Lancashire via cctalk <
> cctalk@classiccmp.org> wrote:
> >
> > Bell 101C
> >
> > https://goo.gl/photos/hrhAwvzMBLWWteXu6
> >
> > https://en.wikipedia.org/wiki/Bell_101
>
> Interesting. Released in 1958 bu
> On May 8, 2017, at 10:27 PM, Pete Lancashire via cctalk
> wrote:
>
> Bell 101C
>
> https://goo.gl/photos/hrhAwvzMBLWWteXu6
>
> https://en.wikipedia.org/wiki/Bell_101
Interesting. Released in 1958 but that unit is stamped 10 years later.
It would be nice to see photos of the circuit board
"And the teletypists knees and feet were always kept warm..."
What is the weight of this modem Pete?
Being the the earlier rev of 101 was earlier technology for SAGE I
wonder how large it was?
Ed#
In a message dated 5/8/2017 9:40:52 P.M. US Mountain Standard Time,
cctalk@clas
Bell 101C
https://goo.gl/photos/hrhAwvzMBLWWteXu6
https://en.wikipedia.org/wiki/Bell_101
-pete
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