RF28B
| RF28B | |||||
| View static image | |||||
| Pattern type | Conduit | ||||
|---|---|---|---|---|---|
| Conduit type | Converter | ||||
| Input | R-pentomino | ||||
| Output | B-heptomino | ||||
| Number of cells | 11 | ||||
| Step | Unknown | ||||
| Recovery time (ignoring FNG if any) |
33 ticks | ||||
| Minimum overclock period (ignoring FNG if any) |
Unknown | ||||
| Spartan? | Yes | ||||
| Discovered by | Dave 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-heptomino 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 BFx46B will normally be appended to the RF28B to suppress the creation of the 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
- My Experience with B-heptominos in Oscillators, by Dave Buckingham