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I reformatted this a bit so that it will display better on minetest-bower site:

https://minetest-bower.herokuapp.com/mods/nixie_tubes
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nixie_tubes mod by Vanessa Ezekowitz # nixie_tubes mod
This mod provides a set of classic Nixie tubes, and a set of alphanumeric *by Vanessa Ezekowitz*
15-segment tubes similar to Burroughs B-7971, controlled by Mesecons'
Digilines mod. 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. 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 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.
Mesecons Lua Controller and the tube will try to display it.
The classic tubes are numeric with colon and period symbols, and hence will 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.
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 The alphanumeric tubes respond to characters from the standard 7-bit ASCII character set, along with these messages:
character set, along with these messages:
* "off", "colon" and "period" act the same as on the numeric tubes. Note that * "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
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. display, so use a classic tube for those, if you can.
* "del" or character code 127 displays an all-on square, but without segment * "del" or character code 127 displays an all-on square, but without segment #15 (the bottom, chevron-shaped one).
#15 (the bottom, chevron-shaped one). * "allon" or character code 128 will display an all-on square, with segment #15 lit also.
* "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. * "cursor" or character code 129 will display just segment 15.
Any unrecognized word or symbol outside the 32-129 range is ignored. Any unrecognized word or symbol outside the 32-129 range is ignored.
The Decatron tubes respond to 0-9 and "off", same as the others, along with The Decatron tubes respond to 0-9 and "off", same as the others, along with the following actions:
the following actions:
* "inc" will increment the tube's current number value. * "inc" will increment the tube's current number value. If the value overflows from 9 back to 0, the tube will generate a "carry" message.
If the value overflows from 9 back to 0, the tube will generate a "carry" * "dec" will decrement the current value. If the value wraps from 0 back to 9, the tube will send out a "borrow" message.
message. * "get" will query the current state of the tube, responding with a single digit 0-9 or the word "off".
* "dec" will decrement the current value.
If the value wraps from 0 back to 9, the tube will send out a "borrow"
message.
* "get" will query the current state of the tube, responding with a single
digit 0-9 or the word "off".
Tubes emit a small amount of light when displaying something. Tubes emit a small amount of light when displaying something.
Nixies can only be mounted on the floor, while Decatrons can be mounted on a Nixies can only be mounted on the floor, while Decatrons can be mounted on a wall (or a ceiling if so desired).
wall (or a ceiling if so desired).
A Decatron has a small grey spot on its internal insulator to mark the "0"
position.
A Decatron has a small grey spot on its internal insulator to mark the "0" position.