X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 1c

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INT 1C - CLOCK TICK
   This interrupt is called (in the IBM) at the end of each time-update
   operation by the time-of-day routines.
Notes:  points to an IRET by default
        preferred interrupt to chain when a program needs to be invoked
          regularly
SeeAlso: INT 08

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