Terminal Oriented Real Time Operating System TORTOS <operating system> (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)