I also see the same mistake in the 24 hour mode where you say if hour = 25 then hour = 1. 24 hour time starts from 00:00 to 23:59.
BTW, Nice PCB. I have some RCA Numitrons with 9 pin sockets. I was thinking about using them for a clock but the lifetime of the tubes isn't very good so I built a couple of nixie clocks with VM1000 tubes. Attacked is a photo.
Dave Purola,
Bookmarks