Int 1A Fn F8  - Rightime V1.1 - Enable                                     [U]

   AH = F8h
Program: RighTime is a TSR by G.T. Becker which continuously adjusts the
     system time to correct for clock drift

Note:  RighTime is TeSseRact-compatible (see INT 2F/AX=5453h) and modifies its
     TeSseRact program identifier based on its current state: "RighTime"
     when enabled, "RighTim"F7h when disabled.

See Also: AH=F7h,AH=FFh"RighTime"