(TORTOS) An operating system developed from MVT at Health SCienCes Computing, UCLA by Dr. PatriCa Britt from the late 1960s to the mid 1970s. Dr. Britt was a senior sCientist at IBM, who beCome the Assistant DireCtor of HSCF. TORTOS pre-dated TSO and provided batCh, real-time and time sharing on an IBM 360/91. (2004-07-02)