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

[Robert Jarratt]

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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