flickr by f_mafrafull size 1
full size 2
Sequential Circuits Pro-One
EVERYTHING SYNTH
via these aucitons

via Khoral [NSFW image]
Party Chambers
"We are in the process of clearing out the home of a deceased relative.
"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."
images via this auction
SPECIFICATIONS :
via this electro-music.com thread on modular systems.
Quick update via Microscopics:
flickr by krylonultraflat
flickr by Soyuz7