Could your clock ever give the Tempature? And or Humidity?
I have a few clocks (from nixiekits.eu) that give Tempature and I love that feature.
Have you tried IN-18 tubes? Do you get blue spots?
Maybe I missed this part.. If it was already stated, but does your current code allow you to set the cathode protection (slot machine effect?) every 10 min? Or some sort of user selected length? I find every 10 min to be very appealing, vs every minute, or every hour
Next set of questions.
What do you need to transfer your program to your chip? I.e. If I got your board, could I use a USB plug and update its program?
What do you use to transfer the code to your board?
I'm thinking I do want to use this board for a clock, but I'm not sure I can or want to spend time actually writing/modifying the code for it.
Though... I do think that at some time, writing/modifying my own nixie clock code might be something that I would like to do in the future... Very interesting and different kind of project for me.