Technological Challenges

[simsim314]

Hmm looking at the spartan version of boojum and rectifier, I was wondering what are the chances to find clear spartan 180 degree reflector? it all looks so close to pure spartan reflector, it's kinda sad we don't have one somewhere along those lines.

Anyway I find this circuits very intriguing, thinking of a way to generate tandem 180 degree spartan reflector.

Maybe instead of focusing on spartan G->H, we should be focusing on tandem spartan reflector and duplicator. This could be an interesting branch of circuitry which hasn't explored properly yet, having only tandem G -> H, which as we know works pretty fast, so some extra circuitry in this area could make the tandem approach really workable.

[dvgrn]

Hmm looking at the spartan version of boojum and rectifier, I was wondering what are the chances to find clear spartan 180 degree reflector? it all looks so close to pure spartan reflector, it's kinda sad we don't have one somewhere along those lines.

Yes. It's tantalizingly close, in both cases. On the other hand, this particular search space has probably been covered fairly well. Looking at the rectifier again, it seems as if Adam Goucher must have done something like a transparent-debris ptbsearch search in that space, since he found the rectifier (which has a transparent beehive, and it's transparent simultaneously with the initial block).

So the odds are maybe a little lower that there's a Spartan 180-degree reflector out there that uses the standard block+pi reaction. There could perfectly well be a totally new mechanism -- maybe one that's more compatible with a semi-Snark, while we're wishing? It's hard to chain boojum reflectors or rectifiers together; it would be nice if the return glider's offset were a little bigger, anyway. This is probably why a G-to-H has seemed like the right thing to look for; you'd get a good offset and signal duplication and so on, pretty much for free.

[simeks]

Hmm isn't this one from calcyman is a nice AND gate?

Code: Select all

x = 25, y = 20, rule = LifeHistory
3.2A19.A$4.A17.3A$4.A.A14.A$5.2A13.A.A$21.A3$4.2A13.2A$4.2A13.2A5$17.
2A$17.A.A$17.A2$.2A$A.A$2.A!

I've made the observation that the Pi-to-G with the "bomber plane" still life can be used to make a similar AND-device. The sometimes useful difference is that this version produces an output glider with the same color as the input gliders:

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x = 32, y = 33, rule = LifeHistory
20.A$19.A.A$17.A2.A.A$16.A.2A2.3A$4.A7.2A2.A3.2A3.A$3.A.A6.2A3.3A2.3A
$3.A.A14.A.A8.A$.3A.2A12.A.A7.3A$A19.A7.A$.3A.2A21.2A$3.A.2A7$18.3D$
18.D.D$18.D.D7$10.2A$9.A.A$11.A2$26.2A$26.A.A$26.A!