can someone explain to me why PS/2 has three very similar scan code sets and all of them are cursed beyond belief
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except for the part where the controller doesn't ... ah goddamn it why am I even bothering
Also, I don't know if these were all mechanical at the time, but only those can have NKRO and key diodes. For straight matrices, pressing three keys describing a right angle in the matrix is abiguous. Therefore there is room for optimizing the matrix to make that rare.
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I've read that you *can* put diodes on a membrane, but it's much more difficult to manufacture than a pcb. Anyway, IBMs of the era were either capacitive (which gets you NKRO potential with no diodes) or "fancy mechanical parts that ultimately actuate a membrane" (no NKRO)
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