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

[Mike Douglas]

John, I also have a 33 tractor feed unit. Here's a link to what I think is the paper I bought. I'll have to double check.

http://www.possupply.com/8-1-2in-x-11in-20lb-1-2in-Green-Bar-Continuous-Computer-Paper-2700-sheets?sc=64&category=9801#.UsA8Nee9KK0

As a starting point on the form feed question, you mentioned the form feed occurs when you press the comma button. Does every other key print correctly when in local mode or do some other keys also print wrong some (or all) of the time? Most likely the form feed mechanism is working correctly and you've got the more common problem of selector encoding errors.

Mike



> On Dec 29, 2013, at 2:55 AM, "John Ball" <ball.of.john at gmail.com> wrote:
> 
> 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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