I need to replace the logic IC in an original Mac keyboard. It uses the Intel P8021H 2173. I've seen other numbers at the end of that (like 2175). Does anyone know what 2173 means? The cheapest I could find (on Ali Baba) was $14 for a chip; so I'd rather go cheaper if possible. I've found a number of non-2173 variants, but I'm uncomfortable replacing/testing it with another without knowing anything about what the 2173 means.
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