[GreenKeys] Model 28 ticker notes

[John Spigel]

Good document for the 28 stock ticker from our reliable source:

https://www.navy-radio.com/manuals/tty/jh/ttyman3/TeletypeManuals/model28/573-140-100TC.pdf

Has the pallet arrangement and also codes for the typebox and confirms 1 
start, two stop bits.


On 22-May-25 12:54, Peter Gottlieb wrote:
> There is a holder for a roll of paper tape and then a feed which is a 
> driven knurled roller with another one spring loaded on the other side 
> of the tape.  The only way to run this backwards would be to modify it 
> mechanically to go in the opposite direction (could be very challenging) 
> and then use an external holder for the paper roll.  Somewhat 
> impractical and I want to keep the unit as original as I can but be able 
> to demo it.  Someone responded that they may have a specific type block 
> for me but will have to search for it.
> 
> 
> On 5/22/2025 12:22 PM, John Spigel wrote:
>> Just a silly thought... How is tape fed? Friction rollers? If the tape 
>> would feed in opposite direction your characters would be in the 
>> correct order. Yes? Can you post some closeup pics?
>>
>> On 22-May-25 11:02, Peter Gottlieb wrote:
>>> John W1AN sent me this link:
>>> https://forum.arduino.cc/t/ascii-to-6-bit-lookup-table/387455
>>>
>>> I had not seen that and simultaneously realized the character 
>>> positions in the type block are not in any standard order.
>>>
>>> Before I realized that I rearranged the standard model 28 type block 
>>> into an ordered one for the ticker which has letters in two rows and 
>>> figures in the other two rows.  Since I have to print upside down due 
>>> to the differences in the chirality of the fonts between standard and 
>>> ticker, I also have the interesting problem of printing in backwards 
>>> order.  So if I want to print ABCD I have to send DCBA to the printer 
>>> and also send the value (also in reverse order) before that.  With a 
>>> microprocessor sending data this is not a big deal.
>>>
>>> I sent a string of increasing codes (0 through 63) to the printer and 
>>> have remaining problems (see attached):
>>> 1)  The print spacing is very uneven
>>> 2)  Repeating characters, such as the 1
>>>
>>> Next step will be to try and send characters to match mechanical 
>>> movement...
>>>
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