IRET             Interrupt Return                    Flags: O D I T S Z A P C
                                                            r r r r r r r r r
IRET

          Logic:    POP IP
                    POP CS
                    POPF                          ; Pop flags from stack

    IRET returns control from an interrupt routine to the point where the
    interrupt occurred, by popping IP, CS, and the Flag registers.

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   Operands                  Clocks   Transfers  Bytes   Example
   no operands                 32         3        1     IRET
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