Thanks for the post.
By way of background, there is an internal bit within the real-time clock (RTC) that determines what century it is set at.
If the coin cell becomes depleted, this bit can then go to zero which represents the last century.
However, each time it powers on, Argo Navis checks for this condition and sets the time to 1 Jan 2000 which includes setting the century bit to a 1.
Obviously it has not done this in this case.
To be honest, it is a strange condition and armed with a deep understanding of how all this works, one that would seem logically impossible,
However, we did have at least one report of it from a customer in December 2019 and they resolved it for themselves by upgrading the firmware,
the act of which in itself magically set things right. So it remained a mystery why it was not automatically being set at power-on otherwise.
If you have an Argo Navis serial cable and USB Adapter, you could try a couple of things.
Firstly, ensure the serial port you are connected to is running with a STARTUP command of 'navis' and a BAIUD rate of 38400.
Then start Argonaut and connect to the unit.
You should get a % prompt in the Argonaut terminal window when communication is established or if you press the PC enter key in the terminal window.
Then using the Argonaut Date/Time pulldown menu, select Set Date/Time. That will transmit the date/time from the PC to the unit and it might resolve it.
Failing that, use Argonaut and load Argo Navis version 3.0.4 firmware :-
http://www.wildcard-innovations.com.au/firmware.html
That might also resolve it,
If it does not, email me at
sales@wildcard-innovations.com.au and we can try and help resolve it. It certainly is unusual.