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Doom can run on anything (pawb.social)
submitted 3 years ago by to c/memes@lemmy.ml
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[–] 159 points 3 years ago (15 children)

there are 8 logic gates in a byte

uh. no? a logic gate isn’t a bit. you can store a single bit with a pair of not gates to make a flip flop, but the core logic here is flawed

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  • [–] 83 points 3 years ago (5 children)

    Right? Even if it weren't, this only calculates how many crabs it would take to store Doom, not run it.

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  • [–] 36 points 3 years ago (4 children)

    No mention of fps or latency, authors clearly not gamers.

    Imagine some Smash Bros players who get pissy about 16.6ms playing on a CrabCPU with 13s latency...

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  • [–] 28 points 3 years ago (8 children)

    you can store a single bit with a pair of not gates to make a flip flop

    Isn't it a pair of NAND gates? You can make anything with NAND gates.

    Like this:

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  • [–] 20 points 3 years ago* (last edited 3 years ago)

    You can also do it with NOT gates. The driver needs to overpower the gates to change the bit and then it acts like a D flip flop rather than an RS flip flop like NAND gates will. But that's generally how they're actually made. SRAM generally looks like this: The side transistors are called access transistors; they're there so you can selectively read/write, but aren't needed to store the bit.

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  • [–] 5 points 3 years ago* (last edited 3 years ago) (2 children)

    So here’s some bad math. 160 crabs per NAND gate / byte. Doom’s original file size is roughly 2.39MB (I couldn’t find an actual source for this but it’s touted all over the web).

    So 2390000 bytes * 160 crabs is 382400000 crabs.

    So you can run doom on 382.4 million crabs

    Edit: store, not run

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  • [–] 2 points 3 years ago (1 child)

    From the paper the picture is of an and gate.
    https://wpmedia.wolfram.com/uploads/sites/13/2018/02/20-2-2.pdf

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  • [–] 5 points 3 years ago

    They've got diagrams of OR and AND gates with the crabs.

    I feel like they would need a NOT gate to do anything meaningful, which obviously isn't possible. You can't have zero crabs going in with crabs coming out. Without a NOT gate I don't think they can do much in the way of traditional computing - you probably can't run Doom on any number of crabs (although I'd love to be proven wrong).

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