I seem to be going backwards with my display technology for this emulator. First it was an LCD display, then LED’s, now Nixies! I completed wiring up a set of TaylorEdge SmartNixies (http://www.tayloredge.com/storefront/SmartNixie/index.html) using the IN-12b Nixie tube. They make using Nixies with a micro-controller easy. Each module has a PIC controller that is I2C addressable, so wiring is much easier than wiring up all the cathodes and anodes of 6 tubes – just +5V, +170V (for the tubes), GND, and SDA/SCL data lines. 5 wires daisy chained together.
I need to find an enclosure to get this mounted in, and given the size I’ll need I am thinking about a wooden enclosure with a speaker as well, unless I find some old test equipment shell I can mount this in – like an old Heathkit Frequency counter or similar.
So, to review, LCD is nice, LED’s are correct (the original DG5 used LED’s), and Nixies are the best!