The type of keyboard used is known as a "Low-resistance contact" keyboard, the resistance being about 1000 ohms or so. As you use the keyboard, the resistance of the contacts tend to go up as it wears and oxidizes. For the regular keyboard and the RESET key this increase in resistance causes no problems as of yet but time passes (decades) keys will begin to cease registering. But the console keys (OPTION, SELECT, and START) are read by a different IC, and the change in resistance will eventual
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