[GreenKeys] M28 identification - Mark I vs Mark II vs Mark III

[Nick England]

Created a page and added a few photos -
http://www.navy-radio.com/tty/28-mark.htm
Cheers,
Nick

On Thu, Aug 22, 2019 at 1:46 PM Nick England <navy.radio at gmail.com> wrote:

> More idle curiosity - and to create a web page with some info and photos
> I think I know the following quick ID features:
> Mark III
>   - new style cam transfer levers for keyboard transmitter.
>   - new style keyboard hood and key guide with 2 screws for clear info
> covers
>   - printer has new style left side mounting for stunt box
>   - printer ribbon spool hold-downs are wire
> Mark II
>   - old style cam transfer levers for keyboard transmitter.
>   - old style keyboard hood and key guide with one screw for clear info
> covers
>   - printer has old style left side mounting for stunt box
>   - printer ribbon spool hold-downs are solid
> Mark I ???
>  - is this like a Mark II but with the very early 2-row electrical
> connectors?
>
> Did the printer and keyboard have separate Mark generations?
> i.e. Was there a Mark III keyboard before a Mark III printer or did they
> change at the same time?
>
> I'm sure there are some glaring differences that I have completely
> overlooked - additions and corrections are welcome!
>
> Nick England K4NYW
> www.navy-radio.com
>
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