Yesterday at a hamfest I bought a whole rail of NE558s. These are used in the Apple ][+/][e joystick port. Let me know if there's any need for them.
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I have 1 or 2 spares, but these chips are getting hard to find. There is a hack to make a replacement from 555s but it isn't pretty. I've heard that some of the chips being sold out of China, particularly Signetics marked ones may be questionale or even counterfeit chips and may not work at all or not in some applications.