STI - Set Interrupt Flag  (Enable Interrupts)

        Usage:  STI
        Modifies flags: IF

        Sets the Interrupt Flag to 1, which enables recognition of all
        hardware interrupts.  If an interrupt is generated by a hardware
        device, an End of Interrupt (EOI) must also be issued to enable
        other hardware interrupts of the same or lower priority.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              2     2     2     5             1

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