Can someone tell me what this chip does?

[Chris W]

I bought a breadboard with several chips from an auction on ebay, and I
am having trouble finding what one of them is. It has Motorola's logo
on it. It is a 28 pin IC with 4 lines of text printed on it.
SC88893P
CHSS 5190
3C31A
LLKC9051

--
Chris W
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