SUPERVISOR RELEASE NOTICE VSN 26C
          _________________________________


      This Supervisor incorporates the following changes:-

         1) Allows "Snoozing" if incorporated at compile time.
            This feature allows processes to be suspended in store
            for short periods. It is designed for very large stores.

         2) Improved FAST(27) with transfer aborting.   This eases
            pressure on the Disc channels by not starting writeouts
            on pages which have been recaptured by the time the disc
            is on cylinder.

         3) Incorporates the new OPER(31). See separte documentation.

         4) Improved GPC(29) witn "CDS" command for dynamic
            reconfiguration.
            See separate documentataion.

         5)  Incorporates TAPE(65) with better recovery after a deck
            powers off or loses vacuum spontaneously.

         6) Has new self optimising overallocation control that adjusts
            overallocation based on Deadlock frequency.

         7) Has improved Supervisor monitoring particulary of pageturns.

         8) Has more detailed control over optional features by means
         of a redesigned "MONLEVEL" control.








                                        P. Stephens    12/05/80