INT 75h (117) (IRQ 13)   Math CO-Processor

      Math CO-Processor (called by hardware 8259-2 IRQ 13)

         The math coprocessor 80287 invokes this interrupt.  Int 75h calls
         the non-maskable interrupt int 2 to halt the system (80287 is not
         used if this vector is left pointing here).  Programs which use
         the 80287 must re-vector this interrupt to use the 80287.