[GreenKeys] Interesting modem for a teletype up on eBay

[Chris Elmquist]

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