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This is a link post Brilliant little logic puzzler.
Amazed it's not GC.

Probably far too easy for folk that do this kinda thing as a hobby/career. But extremely satisfying for folk like me who don't.
 (Huw Edwards Yer Maw's got the Hantavirus, Tue 23 Jun 2026, 14:56, Reply)
This is a normal post The fact that it gets relay logic fundamentally wrong on the first level means that I won't be playing it further...
You build a relay NAND gate using relays with normally-closed contacts: the gate inputs are wired to each of the relay's coils, logic high voltage level is wired to one side of each of the relay's contacts, the gate ouput is formed by wiring all of the other sides of the relay's contacts together.
 (I helped save b3ta! Happosai _,,,,_(O ; o)_,,,, Tue 23 Jun 2026, 20:39, Reply)
This is a normal post I might give it another go on a proper screen.
I note that there are NC relays there but for some reason you can only connect the relay contacts to one thing, so I gave up.
 (I helped save b3ta! jonbob loves you, Tue 23 Jun 2026, 22:52, Reply)
This is a normal post The inability to connect multiple contacts annoyed me too.

(I helped save b3ta! wheresthefish Partly filled with wrong, Tue 23 Jun 2026, 23:01, Reply)
This is a normal post I reached Full Adders then it wouldn’t fit on my phone’s screen any more

(I helped save b3ta! jonbob loves you, Wed 24 Jun 2026, 6:50, Reply)
This is a normal post I moved to the laptop
Have got to ALUs so far. It's surprising how much of this I can remember from a degree course over 25 years ago...
 (I helped save b3ta! wheresthefish Partly filled with wrong, Wed 24 Jun 2026, 21:40, Reply)
This is a normal post Thank fuck you explained that.
I was confused by it not working. Is this 'vibe' coded perchance?
 (I helped save b3ta! FeralCatMan Long ads need comments sections, Tue 23 Jun 2026, 22:56, Reply)
This is a normal post I get that
But once you get past the nand, the building blocks are logic gates rather than discrete components.

The remnants of the half-an-electronics-degree I did years ago remind me that you can make any circuit out of nand gates, but that's about as far as I remember.

Fun for a while, I reckon
 (I helped save b3ta! Boot I want to know what you meant, Thu 25 Jun 2026, 19:24, Reply)
This is a normal post Once you get past the ALU the complexity drops right off
It becomes much more of a systems engineering problem than electronics as it's more about connecting the blocks together than generating them.
 (I helped save b3ta! wheresthefish Partly filled with wrong, Fri 26 Jun 2026, 14:38, Reply)
This is a normal post No idea what’s going on there.

(I helped save b3ta! Fray Brentos *mega-belms*, Wed 24 Jun 2026, 7:32, Reply)
This is a normal post Oh I am going to have to
In a previous job I had to repair a console that would send a command to a connected system and it did a checksum entirely in diode and relay logic
 (Captain Ignorant what does this button do..., Fri 26 Jun 2026, 10:16, Reply)