ESS ES1989S Allegro motherboard sound controller.
Looks like 350 nm 3-metal or so and appears to be the same process as the Silicon Image SII164 although so far it's not known which fab this is.
The number for a 1977 patent on speech synthesis is marked on the top of the package.
Package
Markings:
(ESS logo) Allegro (TM) ES1989S L510 TSU28883S (P)4,214,125 (C)
Die
Size is approximately 5360 x 4040 μm (21.65 mm2)
Overview
Logo/markings. Looks like 3 metal layers since there's 3 via masks.
Random logic
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