X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 04 - internal hardware

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INT 04 - internal hardware - OVERFLOW
   Generated by INTO instruction if OF flag is set.  If flag is not set, INTO
   is effectively a NOP.
Note:   used to trap any arithmetic errors before the erroneous results
          propagate further through the computation
SeeAlso: INT 00

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