This is probably old beaten stuff but here goes. Looking again in the CC2 Service Manual (1983) it says the MC6847 (Motorola DS9823) so I Googled DS9823 and found this: http://www.colorcomputerarchive.com/coco/Documents/Microprocessors/MC6809/Mo torola%20MC6847%20MOS%20Video%20Display%20Generator%20Datasheet.pdf