CLI - Clear Interrupt Flag (disable)

        Usage:  CLI
        Modifies flags: IF

        Disables the maskable hardware interrupts by clearing the Interrupt
        flag.  NMI's and software interrupts are not inhibited.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        none              2     2     3     5             1


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