Gregory's Servertoday's mystery chip: the National Semiconductor MM5827D. I think it is a memory but I can't find any information about it.
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 I think I see 4 large output drivers in the upper left. I suppose that could be 2 differential pairs, but I think it might be more likely to be for audio or similar.  @tubetime The die really looks like a real time clock. I don't know how this 18 pin variant differs from the 16 pin variants, though. |
hmm the die says it is the MM4827.