The third category is for the RTC option. You can turn it on or off.
The fourth category is for the 24Hr/12Hr mode. If you prefer the US style, turn on the 12 hour
mode. Here you can also suppress leading zeroes, which will work in both 24Hr/12Hr mode.
All the changes you make to these settings will be stored automatically inside the clock.
If you have any further questions, please contact me at
or look for additional information at
www.franktechniek.nl
Have fun with your new nixieclock!
Thanks,
Frank Bemelman.