FWIW, here is a list of the M42 options (thanks to Leanne W1WXS)
https://www.navy-radio.com/tty/m42/m42_144908451.jpg
The leftmost column options are listed in the 516M manual as "User Programmable" while the rest are the "Installer Programmable" ones which I can't figure out how to change,,,,
Nick England K4NYW
www.navy-radio.com


On Wed, Sep 29, 2021 at 2:18 PM Nick England <navy.radio@gmail.com> wrote:
I have finally figured out some options on my Telex Basic M42 ASR (thanks to greenkeyer Leanne for a copy of 516M). 
But when I get to the end of the User Programmable Options list, I am stuck. 
How do I access the Installer Programmable Options like baud rate, answer-back, etc. 

Probably the magic switch is staring me in the face, but I can’t figure it out. I am fully prepared to slap my forehead and say Doh! if someone can please enlighten me. 
Cheers
Nick

--
Nick England K4NYW
www.navy-radio.com