In this blog post, I finally put together my Nixie Tube clock based on the RC2014. This video includes a review of the schematics for all the other boards. The clock can either run off an internal BQ4845 real-time clock chip, or it can run off a GPS module that is attached to the serial port. A SP0256A-AL2 speech synthesizer is included, which allows the clock to talk. I wrote the clock software in assembly. Nixie tubes are driven by some of my prototype calculator display boards and use shift registers. For more electronics stuff, schematics, etc., see my blog at http://www.smbaker.com/