The type of keyboard used is known as a "Low-resistance contact", the resistance being about 1000 ohms or so. As you use the keyboard, the resistance of the contacts tend to go up. For the regular keyboard and the RESET key, this increase in resistance causes no problems. But the console keys (OPTION, SELECT, and START) are read by a different IC, and the change in resistance will eventually keep the console keys from working. (The HELP key is actually read as just another letter key).
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