[GreenKeys] Interesting modem for a teletype up on eBay

[Jim Backus]

A very encouraging story. I'm expecting to get a Creed 444 that has been 
stored in a damp shed. Besides corrosion there is evidence that mice 
have been living in it. It sounds a similar situation to the model 33 
that you've restored.

I'll have to assess how realistic it is to restore it, otherwise it will 
be scrapped for spare parts.

Jim
G4PFJ, Essex UK

On 13/02/2011 21:09, Chris Elmquist wrote:
> I offered that I'd send a few pictures of my Anderson-Jacobson branded
> model 33 with internal acoustic coupler so here they are,
>
> https://picasaweb.google.com/117891262011490779403/AndersonJacobsonModel33Teletype?authkey=Gv1sRgCOOcsIee0934eA&feat=directlink
>
> You can also see the slashed-oh and unslashed-zero on the keyboard which
> is a little unique I think.
>
> I didn't see that configuration in a recent document that went around
> showing which companies certain keyboards were built for.
>
> Sadly, when I got this machine, it had been stashed in a basement
> where the owner kept some kind of pet birds.  The birds had
> decided that this M33 was a great place to dump...  you know...
> dump everything... including sticks, feathers, seeds, stones... both
> before and after consuming said items.  The inside of the machine was
> a disaster.  They also pecked at the rubber cups on the acoustic coupler
> and so those are a little beat up with divots all over them.  Sigh.
>
> Was a lot of work to clean it up and was my first complete tear down
> and rebuild of a '33.   But it works FB now including punch and reader!
> UV has gotten the best of the keyboard and there's a big patch on the lid
> where a giant decal had been that caused that area to age differently...
> but I guess we call all that patina right? Plastic patina?  :-)
>
> Chris N0JCF
>
> On Wednesday (02/02/2011 at 09:30AM -0600), Chris Elmquist wrote:
>> Sorry-- I meant to comment on the modem modulation too...
>>
>> The unit I have is most definitely a Bell 103 originate modem.  110 or
>> 300 baud intended for originating the call to a timeshare service
>> such as John describes.
>>
>> A 103 originate modem transmits with 1270/1070 mark/space tones and
>> receives 2225/2025 while the answer modem obviously does the reverse.
>>
>> ie,
>> http://en.wikipedia.org/wiki/Bell_103_modem
>>
>> Chris N0JCF
>>
>> On Wednesday (02/02/2011 at 09:24AM -0600), Chris Elmquist wrote:
>>> On Wednesday (02/02/2011 at 08:04AM -0600), John Foust wrote:
>>>> At 12:10 AM 2/2/2011, Christian Gauger-Cosgrove wrote:
>>>>> I find it most interesting because it appears as though it is designed
>>>>> to replace the right-hand cover panel of a Model 33 or Model 32.
>>>>> Quite ingenious if you ask me.
>>>> Seems quite normal to my USA Midwestern computer-geek eyes.  Several of
>>>> the first 33s I used were like this.  300 baud to DEC time-sharing systems
>>>> in the mid-70s.
>>>>
>>>> 1200 baud wasn't commonly available to consumers until, what, 1984?
>>> I have a '33 that was rebranded as an Anderson-Jacobson unit and has
>>> an AJ acoustic coupler built into the right-hand cover panel just as
>>> you describe.
>>>
>>> The modem plugs into the 20mA loop at the Molex connector bank at the
>>> back of the '33 with a single connector and gets power and transmit
>>> and receive loop over that single connection.
>>>
>>> The LOCAL / LINE switch was relocated to the panel of this modem and
>>> then the front plate (below the keyboard) of the '33 has no hole where
>>> the local/line switch would normally be located.  That plate is then
>>> logo'd with the Anderson-Jacobson "waveform" logo and the 33's lid over
>>> the typing mechanism has an AJ decal stuck over where the Teletype logo
>>> is normally found.
>>>
>>> This '33 also has a slashed-oh on the keyboard and typewheel--  as
>>> opposed to the more common slashed-zero.
>>>
>>> I'll take a couple pictures and send them to the list as soon as I can.
>>>
>>> Chris N0JCF
>>>
>>> -- 
>>> Chris Elmquist
>>>
>> -- 
>> Chris Elmquist
>>