Sounds like a custom ASIC.
I have an old scanner made by Microtek that came with an adapter ISA card made by Adaptec.
There is only one chip in this board, a 68-pin QFP labeled as follows:
Adaptec
AIC-6360L
CKEA611
711913
D2-38
KOREA

The description of this IC bares some resemblance to yours. In my case, this chip is a custom made ASIC for Adaptec. Yours may be the same.

Tony

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