[GreenKeys] Modems, CCU's and Tractor feed issues

Fri Jan 3 06:09:10 EST 2014

I only looked for the sprocket feed paper, which came from paperstone.co.uk,
this is the one I bought:

http://www.paperstone.co.uk/prod_25772_2508-3574-6545_Computer-Listing-Paper
-1-Part-11inch-x-216mm-Unperforated-Plain-White-2000-Sheets.aspx

Regards

Rob

> -----Original Message-----
> From: Nick Jarmany [mailto:nick.jarmany at quixant.com]
> Sent: 03 January 2014 10:38
> To: Robert Jarratt
> Cc: greenkeys at mailman.qth.net
> Subject: RE: [GreenKeys] Modems, CCU's and Tractor feed issues
> 
> Rob,
> 
> Can you let me know where in the UK you found your supplies? Was that for
> 1" paper tape as well as typing roll?
> 
> Nick
> 
> -----Original Message-----
> From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-
> bounces at mailman.qth.net] On Behalf Of Robert Jarratt
> Sent: 29 December 2013 10:53
> To: 'John Ball'; greenkeys at mailman.qth.net
> Subject: Re: [GreenKeys] Modems, CCU's and Tractor feed issues
> 
> I too have a tractor feed, I am pretty new to 33 restoration so I may have
this
> completely wrong, but your problem with constant line feed sounds like the
> form feed mechanism becoming engaged somehow. I have the opposite
> problem that the line feed mechanism does not work at all. It has been a
> little while since I looked at this now and I no longer recall the
details, but
> that might be a good place to start looking.
> 
> As for paper, I am in the UK and I did manage to find a supplier here. I
seem
> to recall there being a supplier in the US too, it should be just a matter
of
> spending a bit of time with your favourite search engine.
> 
> Regards
> 
> Rob
> 
> > -----Original Message-----
> > From: greenkeys-bounces at mailman.qth.net [mailto:greenkeys-
> > bounces at mailman.qth.net] On Behalf Of John Ball
> > Sent: 29 December 2013 08:55
> > To: greenkeys at mailman.qth.net
> > Subject: [GreenKeys] Modems, CCU's and Tractor feed issues
> >
> > No offense but it took a while to figure out how to subscribe to the
list.
> > ;)
> >
> > So anyways, a few months ago I became the owner of a Marsland
> rebadged
> > model
> > 33 ASCII mode teletype. Came with the console module, the tractor feed
> > option for 8 1/2" paper (Where the heck do you even find that now???)
> > and the UCC-21 rotary dial CCU with external PSU for the paper tape
> reader.
> > Unfortunately it didn't come with a pedestal so I had to fabricate a
> > new
> one
> > and find a replacement chad bucket. While it's nice having the console
> > module I want to use the CCU instead and hang a modem off that.
> > Unfortunately I cannot find any documentation on how the CCU would of
> > interfaced with the old 110 baud Bell 110 modems. Was it really just
> current
> > loop? I can see that the later 103 modems had some sort of D-sub 25
> > connection (god knows if that was RS-232 or something) but those are
> > 300 baud and too fast. I have however found a few modems that still
> > support
> the
> > Bell 101 110 baud standard. The original Smartmodem is one of them
> > however they are all RS-232 and the the teletype is very much a
> > current
> loop
> > device.
> > If I just attached it with a current loop adapter I would be entering
> > commands directly from the keyboard and not usig the CCU. At a quick
> > glance (and again, if the documentation and interfacing info was
> > available
> I'd
> > love to read it) I can see that it's really just a telephone with no
> handset.
> > There's a buzzer to indicate ringing, the rotary dial is for starting
> > the
> call and
> > the four buttons are for turning the teletype and modem on and off,
> putting
> > the modem off hook, setting the teletype to local mode only and
> > putting it back on hook. Any information on this would be very much
> appreciated.
> > Really it's just a remote control for the modem when it was stored in
> > the pedestal. If I knew how it worked I could use a microcontroller to
> translate
> > button pushes into hayes commands so I can simulate the original
> > experience.
> > Another problem I ran into shortly after I got the machine was that
> > the tractor feed was slipping badly in a particular manner. If you did
> > a line
> feed
> > and any time after you had done that you press the comma key the
> > machine will constantly line feed until the cam lobe's high point on
> > the tractor
> feed
> > pushes a lever up again. There's like three or four different linkages
> that
> > might be problematic but it's nearly 1AM and I can't rememebr their
> names.
> > If it helps I have the service manual for the teletype with three or
> > four
> extra
> > pages covering the tractor feed option. Might anyone off the top of
> > their heads know what might need to be adjusted?
> >
> > -John
> >
> >
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