How would I go about finding the datasheet for an outdated IC?
This link may be of some use - although only a block diagram.
From this page - probably not too useful.

That sheet MAY be from "SHEN ZHEN MTC MULTIMEDIA CO.,LTD"

No guarantees, but [these people](SHEN ZHEN MTC MULTIMEDIA CO.,LTD) have been playing 
the same game - Parallax forum, 2010.

May be able to help - 2010

Were made by Cheetek.
Absorbed by Novatek in 2008.