Boat-bit: Difference between revisions
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{{Glossary}} | {{Glossary}}{{Pattern | ||
{{Pattern | |||
|name = Boat-bit | |name = Boat-bit | ||
|pname = boatbit | |pname = boatbit | ||
|type = Memory cell | |type = Memory cell | ||
|c = 11 | |c = 11 | ||
|bx = 8 | |||
|by = 3 | |||
|symmetry = C1 | |||
|discoveryear = 1971 <!--Lifeline Volume 3 with a fishhook instead of a snake--> | |||
|rulemin = B3/S23 | |||
|rulemax = B378/S2378 | |||
|rulespecial = [[Conway's Game of Life|Conway Life]] | |||
|isorulemin = B3-cey/S2-in3-ckqy | |||
|isorulemax = B34-airyz5-acn6-n78/S234ceirty5eikry6-ac78 | |||
|plaintext = true | |||
|rle = true | |rle = true | ||
|viewerconfig = #C [[ ZOOM 8 THUMBSIZE 2 AUTOSTART PAUSE 2 LOOP 100 GPS 10 ]] | |||
}} | }} | ||
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]]). 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.<ref>{{CiteLexicon|file=lex_s.htm#snakebit|name=Snake-bit|accessdate=June 3, 2009}}</ref> 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. | 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.<ref>{{CiteLexicon|file=lex_s.htm#snakebit|name=Snake-bit|accessdate=June 3, 2009}}</ref> 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 | 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: | |||
{{EmbedViewer | |||
|pname = boatbitmwss | |||
|position = center | |||
|viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 WIDTH 480 HEIGHT 360 Y 7 ZOOM 16 GPS 20 PAUSE 2 LOOP 150 ]] | |||
}} | |||
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$19bo! | |||
|position = center | |||
|viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 WIDTH 480 HEIGHT 360 ZOOM 16 GPS 20 PAUSE 2 T 55 PAUSE 2 LOOP 56 ]] | |||
|apgcode = xs13_1784c871 | |||
}} | |||
Alternatively, any object capable of supporting a boat-bit reaction can have an [[anvil]] or [[mango]] with [[dock]] inducted to it, here shown beginning with an [[Eater 1]] in the optimal known synthesis for the shift-eater head on anvil and ortho-eater head on mango with dock. | |||
{{gallery top}} | |||
{{gallery item|{{EmbedViewer | |||
|rle = x = 24, y = 12, rule = B3/S23 | |||
2b2o$bobo$bo$2o3$21b2o$15b3o3bobo$15bo5bo$11b2o3bo$10bobo$12bo! | |||
|position = center | |||
|viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 WIDTH 480 HEIGHT 360 ZOOM 16 GPS 20 PAUSE 2 T 55 PAUSE 2 LOOP 56 ]] | |||
|apgcode = xs20_0ca23z255d1e8 | |||
|caption = component using a boat-bit for adding an anvil. | |||
}}}} | |||
{{gallery item|{{EmbedViewer | |||
|rle = x = 20, y = 12, rule = B3/S23 | |||
2b2o$bobo$bo$2o2$11b3o$11bo$12bo$18bo$8b3o6b2o$10bo6bobo$9bo! | |||
|viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 WIDTH 480 HEIGHT 360 ZOOM 16 GPS 20 PAUSE 2 T 55 PAUSE 2 LOOP 56 ]] | |||
|apgcode = xs22_o8wci96z0hhldz01 | |||
|caption = component using a boat-bit for adding a mango with dock. | |||
}}}} | |||
{{gallery bottom}} | |||
==References== | == References == | ||
<references /> | <references /> | ||
==External links== | == External links == | ||
{{LinkLexicon|lex_b.htm#boatbit}} | {{LinkLexicon|lex_b.htm#boatbit}} | ||
{{LinkCatagolue|xs11_dbz352|patternname=Boat on snake}} | |||
{{GliderNavbox}} | |||
[[Category:Factories]] | |||
Latest revision as of 15:41, 21 August 2024
| Boat-bit | |||||||||
| View static image | |||||||||
| Pattern type | Memory cell | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Number of cells | 11 | ||||||||
| Bounding box | 8 × 3 | ||||||||
| Static symmetry | C1 | ||||||||
| Discovered by | Unknown | ||||||||
| Year of discovery | 1971 | ||||||||
| |||||||||
| |||||||||
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 or mango with dock inducted to it, here shown beginning with an Eater 1 in the optimal known synthesis for the shift-eater head on anvil and ortho-eater head on mango with dock.
| component using a boat-bit for adding an anvil. (click above to open LifeViewer) Catagolue: here |
(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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