Boat-bit: Difference between revisions
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|bx = 8 | |bx = 8 | ||
|by = 3 | |by = 3 | ||
|symmetry = C1 | |||
|discoveryear = 1971 <!--Lifeline Volume 3 with a fishhook instead of a snake--> | |discoveryear = 1971 <!--Lifeline Volume 3 with a fishhook instead of a snake--> | ||
|rulemin = B3/S23 | |rulemin = B3/S23 | ||
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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== | == 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. | 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 | {{EmbedViewer | ||
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{{gallery bottom}} | {{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}} | {{LinkCatagolue|xs11_dbz352|patternname=Boat on snake}} | ||
Latest revision as of 15:41, 21 August 2024
| Boat-bit | |||||||||
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| Pattern type | Memory cell | ||||||||
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| Number of cells | 11 | ||||||||
| Bounding box | 8 × 3 | ||||||||
| Static symmetry | C1 | ||||||||
| 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 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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