In a message dated 7-10-94, Steven Chiang said:
"I also believe the Intellivision and Coleco's system
both used 6502s..."
Colecovision used a Z-80 CPU and 9928VDP, as did the Coleco Adam computer.
According to a recent post elsewhere, the Intellivision used some offbeat
CPU running at a 500Khz (yep...0.5Mhz) clock rate.