Early on, Cooper worked with Gordon Eubanks to develop, debug, document, and publish his business programming language, CBASIC, an early competitor to Bill Gates’ and Paul Allen’s Microsoft BASIC. Eubanks wrote CBASIC’s precursor, BASIC-E as a student project while at the Naval Postgraduate School in Monterey, California with professor Gary Kildall. When Eubanks left the Navy, he joined Kildall’s successful operating system company, Digital Research, Inc., in Monterey. Soon thereafter, Eubanks and Kildall invited Cooper to join them at Digital Research as one of four founders of their research and development department. After two-years at DRI, Cooper departed to develop desktop application software by himself.