 Atari accepted the proposal, and when the specifications were finalized in October 1978, Paul Laughton and Kathleen O'Brien began work on the new language.The contract specified the delivery date on or before 6 April 1979 and this also included a File Manager System (later known as DOS 1.0).Atari's plans were to take an early 8K version of Microsoft BASIC to the 1979 CES and then switch to the new Atari BASIC for production.