Project description:
These tubes were originally in a Wang desktop calculator, manufactured in 1969.  A PIC16F73 is the only IC used, although it was a stretch with all 22 IO being used. The timing reference is obtained from the 60 HZ AC line, although during a power outtage a 9 volt NiCad keeps the CPU powered and the timing is generated by an interrupt routine (10 MHZ clock crystal).  A 5 pin header on the main circuit board is used for ISP and allowed for easy debugging.

Link: Nixie clock, PIC16F73

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