Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

   ◄Summary►  ◄Detail►  ◄Key to Flags►
──────────────────────────────────────────────────────────────────────────────
 
Interrupt                                        Flags:  O D I T S Z A P C
                                                         ═════════════════
                                                             0 0
Syntax:  INT number
 
  Generates a software interrupt.  An 8-bit constant operand (0 to 255)
  specifies the interrupt procedure to be called.  The call is made by
  indexing the interrupt number into the Interrupt Descriptor Table
  (IDT) starting at segment 0, offset 0.  The IDT contains 4-byte
  pointers to interrupt procedures.  When an interrupt is called, the
  flags CS and IP are pushed onto the stack (in that order) and the
  trap and interrupt flags are cleared.  STI can be used to restore
  interrupts.  To return from an interrupt, use the IRET instruction.
                                    -♦-