nixie_tubes mod by Vanessa Ezekowitz

This mod provides a set of classic Nixie tubes, and a set of alphanumeric 15-segment tubes similar to Burroughs B-7971, controlled by Mesecons' Digilines mod.

Simply place a tube, right-click it, and set a channel.

Then send a character or one of several control words to that channel from a Mesecons Lua Controller and the tube will try to display it.

The classic tubes are numeric with colon and period symbols, and hence will respond to the literal numbers 0-9, and the words "colon", "period", and "off". Any other symbol or word is ignored.

The alphanumeric tubes respond to characters from the standard 7-bit ASCII character set, along with these messages:

• "off", "colon" and "period" act the same as on the numeric tubes. Note that neither a colon nor a period actually look all that great on a 15-segment display, so use a classic tube for those, if you can.
• "del" or character code 127 displays an all-on square, but without segment #15 (the bottom, chevron-shaped one).
• "allon" or character code 128 will display an all-on square, with segment #15 lit also.
• "cursor" or character code 129 will display just segment 15.

Any unrecognized word or symbol outside the 32-129 range is ignored.

Tubes emit a small amount of light when displaying something.