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[Sarah Evans]

Great topic to dig into. The core issue with ghosting almost always comes down to the matrix topology, not USB bandwidth—people blame polling rate or the USB connection when the real culprit is the row/column scan logic. In a wired matrix, each key sits at a row/column intersection with a diode in series to enforce current direction. When you press three keys that share rows and columns in a certain pattern, current can back-feed through an un-activated key’s diode path, and the controller reads a phantom “fourth” key as pressed. Proper dioding on every single key (not just the “anti-ghosting” subset that cheap OEMs skip) is what breaks those parasitic loops.

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