RF28B: Difference between revisions
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|convertsto = B-heptomino | |convertsto = B-heptomino | ||
|c = 5, 11 | |c = 5, 11 | ||
|m = F | |||
|dx = 12 | |||
|dy = 1 | |||
|step = 28 | |step = 28 | ||
|recovery = 33 | |recovery = 33 | ||
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|viewerconfig = #C [[ THUMBSIZE 2 WIDTH 600 HEIGHT 400 ZOOM 16 GPS 7 PAUSE 2 T 28 PAUSE 2 LOOP 29 ]] | |viewerconfig = #C [[ THUMBSIZE 2 WIDTH 600 HEIGHT 400 ZOOM 16 GPS 7 PAUSE 2 T 28 PAUSE 2 LOOP 29 ]] | ||
}} | }} | ||
'''RF28B''' is a [[converter]] with several known forms, most of which were found by [[Dave Buckingham]] between 1972 and the early 1980s. | '''RF28B''' is a [[converter]] with several known forms, most of which were found by [[Dave Buckingham]] between 1972 and the early 1980s. It accepts an [[R-pentomino]] as input and produces an output [[B-heptaplet]] 28 ticks later. Of nine major variants known {{as of|the end of 2017}}, four versions are shown below. | ||
{{EmbedViewer | {{EmbedViewer | ||
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|viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 GPS 7 ZOOM 10 HEIGHT 800 PAUSE 2 T 28 PAUSE 2 T 48 PAUSE 2 LOOP 49 ]] | |viewerconfig = #C [[ AUTOSTART THUMBSIZE 2 GPS 7 ZOOM 10 HEIGHT 800 PAUSE 2 T 28 PAUSE 2 T 48 PAUSE 2 LOOP 49 ]] | ||
}} | }} | ||
The top variant above is part of the [[L156]] [[Herschel conduit]], but it can be replaced by the variant below it which produces a forward glider output. | The top variant above is part of the [[L156]] [[Herschel conduit]], but it can be replaced by the variant below it which produces a forward glider output. A B-heptomino naturally evolves into a Herschel, as shown above -- but it leaves an extra [[block]] behind which must then be cleaned up before the circuit can be used again. The third variant can be combined with a [[boojum reflector]] or [[rectifier]] to clean up this block. | ||
In the other cases, a conduit such as [[BFx59H]] or [[BRx46B]] will normally be appended to the RF28B to suppress the creation of the block. | In the other cases, a conduit such as [[BFx59H]] or [[BRx46B]] will normally be appended to the RF28B to suppress the creation of the block. | ||
Note that flipping the loaf in the third variant and shifting it one cell | Note that flipping the [[loaf]] in the third variant and shifting it one cell up yields the very similar looking [[RF48H]]. This is a completely different conduit, producing a [[Herschel]] without leaving the extra block. | ||
The fourth variant above, consisting of a single [[boat]], is the earliest one discovered (in 1972). | The fourth variant above, consisting of a single [[boat]], is the earliest one discovered (in 1972). It is used in Paul Callahan's [[Herschel receiver]]. | ||
==External links== | == External links == | ||
{{LinkLexicon|lex_r.htm#rf28b}} | * {{LinkLexicon|lex_r.htm#rf28b}} | ||
* | * {{LinkCallahan|patterns/bhept/bhept.html|patternname=Buckingham on B-heptominos in oscillators}} | ||
Latest revision as of 18:59, 2 October 2025
| RF28B | |||||||||
| View static image | |||||||||
| Pattern type | Conduit | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Conduit type | Converter | ||||||||
| Input | R-pentomino | ||||||||
| Output | B-heptomino | ||||||||
| Number of cells | 5, 11 | ||||||||
| Output orientation | Unturned | ||||||||
| Output offset | (12, 1) | ||||||||
| Step | 28 ticks | ||||||||
| Recovery time (ignoring FNG if any) |
33 ticks | ||||||||
| Minimum overclock period (ignoring FNG if any) |
Unknown | ||||||||
| Spartan? | Yes | ||||||||
| Discovered by | David Buckingham | ||||||||
| Year of discovery | 1972 | ||||||||
| |||||||||
| |||||||||
RF28B is a converter with several known forms, most of which were found by Dave Buckingham between 1972 and the early 1980s. It accepts an R-pentomino as input and produces an output B-heptaplet 28 ticks later. Of nine major variants known as of the end of 2017, four versions are shown below.
| (click above to open LifeViewer) RLE: here Plaintext: here |
The top variant above is part of the L156 Herschel conduit, but it can be replaced by the variant below it which produces a forward glider output. A B-heptomino naturally evolves into a Herschel, as shown above -- but it leaves an extra block behind which must then be cleaned up before the circuit can be used again. The third variant can be combined with a boojum reflector or rectifier to clean up this block.
In the other cases, a conduit such as BFx59H or BRx46B will normally be appended to the RF28B to suppress the creation of the block.
Note that flipping the loaf in the third variant and shifting it one cell up yields the very similar looking RF48H. This is a completely different conduit, producing a Herschel without leaving the extra block.
The fourth variant above, consisting of a single boat, is the earliest one discovered (in 1972). It is used in Paul Callahan's Herschel receiver.
External links
- RF28B at the Life Lexicon
- Buckingham on B-heptominos in oscillators at Paul Callahan's Page of Conway's Life Miscellany