via Shasta Cults
"Shortly after selling his company to CBS in the late 60s, Buchla was tasked with designing a less expensive system to market to schools and universities. EMS had just released the VCS3 and it had started to overtake that market due to low cost and high functional density. Don seemed more interested in researching computer control and had started devising his 500 series system which CBS was not willing to fund. In early 1970 to meet contract requirements 6 prototypes of the 'System 3' were delivered to CBS before Buchla and CBS parted ways."
