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[–] luckyguy 0 points 1 point (+1|-0) ago 

The minimally fancy keyboard to do that with would not be fancy at all. If it has a micro controller it could do it.

It would need some sort of writable persistent memory, possibly in the chip. Most approches would not include it in the chip but this would consider stealth. Still, looking for a flash memory unit somewhere detatched from the microcontroller would be a tell-tail.

Still, quite a few chips use static ram, which is semi reliable to store data. I wonder how big a buffer would have to be to have 50% chance of a password being in there.