"It has long been known that the CEM chips used in so many synthesizers were semi-custom IC. Doug Curtis, just out of college, had won a design contest sponsored by Interdesign (later sold to Ferranti/GEC Plessey) and went on to work for Interdesign before founding Curtis Electromusic Specialties, later to fold into OnChip Systems. The founder of Interdesign and designer of the '555 timer chip, Hans Camenzind, still operates consultancy business in mask programmable analog semicustom IC, Array Design and has written the book Designing Analog Chips that is available free for download or as a print-on-demand hardcopy.
Here are the first two pictures of de-encapsulated (defect) CEM chips, more to follow as time permits."CEM3340/CEM3345 on top
CEM3310 on bottom
You can find more including the data sheets on Stromeko: DIY Stuff.
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