Boat-bit: Difference between revisions
Haycat2009 (talk | contribs) m Another way, anvil induction |
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obo$b2o$bo$11bo$11b3o$14bo$13bo$13b2o3$15b2o$14b2o$16bo$3b3o$5bo$4bo3$18b3o$18bo$19bo! | obo$b2o$bo$11bo$11b3o$14bo$13bo$13b2o3$15b2o$14b2o$16bo$3b3o$5bo$4bo3$18b3o$18bo$19bo! | ||
|position = center | |position = center | ||
|viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 WIDTH 480 HEIGHT 360 ZOOM 16 GPS 20 PAUSE 2 LOOP 56 ]] | |viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 WIDTH 480 HEIGHT 360 ZOOM 16 GPS 20 PAUSE 2 T 55 PAUSE 2 LOOP 56 ]] | ||
|apgcode = xs13_1784c871 | |apgcode = xs13_1784c871 | ||
}} | |||
Alternatively, any object capable of supporting a boat-bit reaction can have an [[anvil]] inducted to it, here shown beginning with a [[Eater 1]] in the optimal known synthesis for the shift-eater head on anvil. | |||
{{EmbedViewer | |||
|rle = x = 24, y = 12, rule = B3/S23 | |||
2b2o$bobo$bo$2o3$21b2o$15b3o3bobo$15bo5bo$11b2o3bo$10bobo$12bo! | |||
|position = center | |||
|viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 WIDTH 480 HEIGHT 360 ZOOM 16 GPS 20 PAUSE 2 T 55 PAUSE 2 LOOP 56 ]] | |||
|apgcode = xs20_0ca23z255d1e8 | |||
}} | }} | ||
Revision as of 05:37, 6 January 2024
| Boat-bit | |||||||||
| View static image | |||||||||
| Pattern type | Memory cell | ||||||||
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| Number of cells | 11 | ||||||||
| Bounding box | 8 × 3 | ||||||||
| Static symmetry | Unspecified | ||||||||
| Discovered by | Unknown | ||||||||
| Year of discovery | 1971 | ||||||||
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A boat-bit is a binary digit represented by the presence or absence of a boat next to a snake (or other suitable object, such as an aircraft carrier or eater 1). The bit can be toggled by a glider travelling along a certain path. Such an object is sometimes called a snake-bit, although that name is less sensible because the snake can easily be replaced by other objects.[1] A correctly timed glider on a crossing path can detect whether the transition was from 1 to 0 (in which case the crossing glider is deleted) or from 0 to 1 (in which case it passes unharmed). Three gliders therefore suffice for a non-destructive read.
The mechanisms involved in reading and writing a boat-bit are shown in the infobox and the image below. The bit as shown is in the 0 state, with no boat present. It is about to be set to 1 by the incoming green glider, and then switched back to 0 again by the red glider. The first crossing glider will survive, but the second will be destroyed.
| Mechanisms key, with gliders colored as described above (click above to open LifeViewer) |
David Bell found a method of reading the bit while setting it to 0 in January 1997. It works by firing a middleweight spaceship at the boat-bit. If it is already 0 then the middleweight spaceship passes unharmed, but if it is 1 then the boat and the middleweight spaceship are destroyed and, with the help of an eater 1, converted into a glider that travels back along exactly the same path that is used by the gliders that toggle the boat-bit:
| (click above to open LifeViewer) RLE: here Plaintext: here |
Other patterns that can be used to perform the boat-bit reaction include beacon (in its dense phase), the barberpoles (in one of the phases, though uncommon), table (if stabilised), carrier, and eater 1.
As a synthesis component
When used on an object with an eater head (such as a snake or eater), the boat may be converted to an eater tail attached to the head (which becomes a z-tetromino) from the other side in three gliders, here shown beginning with a hook with tail in the optimal known synthesis for the hook with tail siamese eater.
| (click above to open LifeViewer) Catagolue: here |
Alternatively, any object capable of supporting a boat-bit reaction can have an anvil inducted to it, here shown beginning with a Eater 1 in the optimal known synthesis for the shift-eater head on anvil.
| (click above to open LifeViewer) Catagolue: here |
References
- ↑ "Snake-bit". The Life Lexicon. Stephen Silver. Retrieved on June 3, 2009.
External links
- Boat-bit at the Life Lexicon
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