Boat-bit: Difference between revisions
show image with colored bits along with sharpened, autostarted infobox view (more helpful than the color code showing only when you click "view static image"); typo |
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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. | 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. | ||
{{EmbedViewer | |||
|rle = x = 25, y = 24, rule = B3/S23Super | |||
6.M$7.M$5.3M8$16.W$14.W.W$10.2M3.2W$11.2M$10.M10.M.2M$21.2M.M6$.M$.2M$M.M! | |||
|viewerconfig = #C [[ X -1 Y -1 ]] | |||
|caption = Mechanisms key, with gliders colored as described above | |||
|position = center | |||
}} | |||
[[David Bell]] found a method of reading the bit while setting it to 0 in January {{year|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: | [[David Bell]] found a method of reading the bit while setting it to 0 in January {{year|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: | ||
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Other patterns that can be used to perform the boat-bit reaction include [[beacon]] (in its dense phase), the [[barberpole]]s (in one of the phases, though uncommon), [[table]] (if stabilised), [[carrier]], and [[eater 1]]. | Other patterns that can be used to perform the boat-bit reaction include [[beacon]] (in its dense phase), the [[barberpole]]s (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. | |||
{{EmbedViewer | |||
|rle = x = 21, y = 21, rule = B3/S23 | |||
obo$b2o$bo$11bo$11b3o$14bo$13bo$13b2o3$15b2o$14b2o$16bo$3b3o$5bo$4bo3$18b3o$18bo$19bo! | |||
|position = center | |||
|viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 WIDTH 480 HEIGHT 360 ZOOM 16 GPS 20 PAUSE 2 LOOP 56 ]] | |||
|apgcode = xs13_1784c871 | |||
}} | |||
==References== | ==References== | ||
Revision as of 18:17, 7 July 2023
| Boat-bit | |||||||||
| View static image | |||||||||
| Pattern type | Memory cell | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 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 |
References
- ↑ "Snake-bit". The Life Lexicon. Stephen Silver. Retrieved on June 3, 2009.
External links
- Boat-bit at the Life Lexicon