[GreenKeys] Model 15 + C-64 Baud rate question

[drlegendre .]

Just came across this.. from a PDF document "TELETYPEWRITERS MADE EASY!"

ADJUSTING THE RANGE FINDER The range finder usually looks something like a
drawing compass with a pointer clamped to the semi-circle with a knurled
screw. With the cover removed, turn your TTY on and loosen the knurled
screw on the range finder pointer. While hitting RYRYRYRYRY ••.•repeatedly,
slowly move the pointer in one direction until the printing just begins to
garble. Stop and note the number on the semi-circle. Now again, hit
RYRYRYRYRY •••repeatedly and slowly move the pointer in the opposite
direction until the printing just begins to garble again. Note the new
pointer position number. If the difference between the two numbers is less
than 40, check lubrication, magnet adjustment, contact spacing and
cleanliness, and look for slipping clutches, worn bearings on the
mainshaft, improper gear meshing (binding or backlash), etc. After
remedying any indicated service needs, finally clamp the range finder
midway between the two positions where garbling starts.

So the range in question is the _receive_  speed range. The procedure finds
the upper and lower speed limits, so that the speed can be set to the
center of that range to cope with other machines which might send data a
little bit more quickly or slowly?

I didn't realize the receive speed could be adjusted independent of the
main motor speed.. need to take a look at the mechanism.

On Sat, Jul 4, 2015 at 4:06 PM, drlegendre . <drlegendre at gmail.com> wrote:

> @Tony
>
> Ok, so even if the unit is set at spec (45.45) I can use the 50 baud
> setting on the C-64 side, so long as I add a timing delay between each
> successive char?
>
> @All
>
> Also, I've been trying to find info on the Range Finder - what is is, how
> it works, now it's adjusted, etc. but I've come up dry. I can't even find a
> section on it in the 138 pp. manual I found. What is that thing for?
>
> On Sat, Jul 4, 2015 at 3:48 PM, tony.podrasky <tony.podrasky at gmail.com>
> wrote:
>
>> GA OMs;
>>
>> You could put a timing loop in after each character - to expand
>> the time before the next character is printed.
>>
>> If the 15 is in good shape, you'll be able to adjust the range finder
>> and get it to print 50 BAUD. That will probably be fine because you
>> won't be getting the "hits" you would get when listening to RTTY
>> on shortwave.
>>
>>
>> On 07/04/2015 11:33 AM, drlegendre . wrote:
>>
>>> Thinking about trying to use a C-64 to communicate with a model 15 that
>>> should be arriving in a couple of months. The native RS-232 routine on
>>> the Commodore has a minimum baud rate of 50, whereas the 15 wants 45.45
>>> or so I've heard.
>>>
>>> Will the 15 tolerate 50 baud? FWIW the C-64 routine sets a pair of
>>> 256-byte FIFO I/O buffers for RS-232 communications, not sure how that
>>> might come into play.
>>>
>>> If it can't take continuous data at 50 baud, what if I only send one
>>> character at a time, with a slight delay such that the total CPM doesn't
>>> exceed the max char rate of 50 baud? IOW, can it take one character's
>>> worth of bits a little faster, so long as the next character doesn't
>>> arrive too soon?
>>>
>>> Thanks for any input.
>>>
>>>
>> --
>> MicroSoft error messages written in Haiku:
>>
>>         Three things are certain:
>>         Death, taxes and lost data.
>>         Guess which has occurred?
>>
>
>
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