> 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
Hi Michael,
dear board
Did you solve your power supply problem?
My Draftmaster I did work for 1 hour, I did even manage to do a demo plot.
Then it died, right before my eyes the display got brighter and brighter and
now - nothing when powering on, except a humming sound.
I think that I’m r
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
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
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
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
On 05/09/2017 08:26 AM, Philipp Pap via cctalk wrote:
Anyhow, now I have 41 and 83 Volts at the 42 and 85V test points,
but always 0 Volts at the +5,-12,+12,+15V test points.
The fuses are good and the secondary transformer seems good as well.
Does this have a switching power supply for th
> Date: Mon, 8 May 2017 21:02:39 -0400
> From: william degnan
> Subject: Re: BETSI Expander for the Commodore PET
>
> On Mon, May 8, 2017 at 8:35 PM, John Ball via cctalk <
> cctalk@classiccmp.org>
> wrote:
>
> > So it seems in the early days of the PET a company by the name of
> > Forethought Pro
>> 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
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
Rtty was fsk. You needed a scope or a needle to
indicate when the BFO was centered.
That would be tuning.
I think the Wiky was talking about the 101 standard, not
the hardware.
One wonders what all the terminal strips were for.
Maybe more phone line or you could connect to more
TTYs
Dwight
> 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
I would guess the lower voltages are generated from
a switcher off the 85 or 42 volt lines.
First check with an ohm meter in those lines to look for
a dead short.
Dwight
From: cctalk on behalf of Philipp Pap via
cctalk
Sent: Tuesday, May 9, 2017 6:26:43 AM
> 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 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
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
All this talk about 8 inch floppies got me to look at a unit I have
stored away. It is a rack mounted dual 8 inch floppy drive, SMS FWT
Series.
Model - FWT0522I-R
It has one IDC connection on the back, 34 pin.
The formatter in the unit has numbers - 1001828-0001 H and 0003451-0001
J written
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
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
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
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,
> Am 09.05.2017 um 18:10 schrieb Jon Elson :
>
> On 05/09/2017 08:26 AM, Philipp Pap via cctalk wrote:
>> Anyhow, now I have 41 and 83 Volts at the 42 and 85V test points,
>> but always 0 Volts at the +5,-12,+12,+15V test points.
>> The fuses are good and the secondary transformer seems good a
> Am 09.05.2017 um 18:10 schrieb Jon Elson :
>
> On 05/09/2017 08:26 AM, Philipp Pap via cctalk wrote:
>> Anyhow, now I have 41 and 83 Volts at the 42 and 85V test points,
>> but always 0 Volts at the +5,-12,+12,+15V test points.
>> The fuses are good and the secondary transformer seems good a
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-
Hello,
I have a clone PDP11, including an SMS QBUS board and a 8" drive.
Not sure if it's the same model as yours.
The controller runs MSCP for floppy with RX02 or IBM format , and for an
MFM hard disk like Seagate ST251.
Board code is SMS FWD0106.
I should have some manual and drivers for it somew
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 a
went back to the sean found this and one more switch bunch more cards
https://c1.staticflickr.com/5/4159/34433937071_ddcbdb994a_b.jpg
> 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,
>
>This sounds an awful lot like the KIMSI, which was the same manufacturer. I
>have such a unit, and as you would expect, it connects to the KIM-1. I can
>drag it out and take a picture of it but I don't remember it particularly
>complex on the board.
I know Bruce Damer has a KIMSI as well in the c
I am trying to reproduce a PCB design, and I have removed all the ICs,
scanned the boards, and am trying to draw it up in EAGLE. But, it would
much easier if I could import the actual PCB as a bitmap under my PCB
layout, to ensure I have have everything in the right place.
Sadly, my graphics
i rescued 2 today that were buried for a yr in mud cleaned it up the one
that was still one peic
https://imagizer.imageshack.us/v2/882x662q90/923/M4e2cc.jpg
noticed it was starting to curve as it dried so i cleaned the mud off it
and put it between a towel and some concreat blocks? that should s
this wound up in my spam folder
On Fri, May 5, 2017 at 1:59 AM, Paul Anderson via cctalk <
cctalk@classiccmp.org> wrote:
> Please contact me off list with questions. Domestic shipping $15.
>
Is there 42 Volts on both sides of the 42V fuse? Seems odd that there's 42V
to the switcher but no voltage at the other end but the fuse is intact.
Normally when the switcher blows, the main switching transistor shorts and
takes out the supply fuse.
The power supply transistors are on the b
Anyone else have a 101c hooked up ? When I get this one and the 35KSR it
belongs with I would like to try getting both to talk to each other and do
a video.
On May 9, 2017 3:18 PM, "Bill Gunshannon via cctalk"
wrote:
>
>
> From: cctalk [cctalk-boun...@cla
Hi,
I was contacted though my site by someone looking for a boot disk for their
California Computer System S-100 2200 computer with Morrow's Disk Jockey
DJ/DMA floppy disk controller. I checked and found what might be a
suitable disk.
I imaged the disk and the file has been uploaded to my web si
https://goo.gl/photos/GdcXVcWBS43Gh3UU7
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