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Running DOOM In A Keycap Takes Careful Work
(hackaday.com)
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Yeah it literally runs on pregnancy tests
It wasn't running on the pregnancy test then, and it's not running on a keycap now. Both this and the pregnancy test are someone putting their own hardware into a random enclosure and saying "I'm running Doom on X!"
No, you're not really. Would you say that I'm running Doom on a banana if I put the same hardware inside a banana peel? No, because it's just a case for something else.
If he was running it on the keyboard's existing processor and it had a screen in the key, like Doom on a Mac touchbar, then I would agree.
He was streaming doom to the pregnancy test. it's a pretty cool hack, even if he's not "running" it on the pregnancy test.