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CLI              Clear Interrupt-Enable Flag         Flags: O D I T S Z A P C
                                                                0
CLI

          Logic:    IF . 0

    CLI clears the Interrupt Enable Flag, suppressing processor
    recognition of maskable interrupts. No other flags are affected. (Non-
    maskable interrupts are recognized no matter what the state of the
    interrupt enable flag.)

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   Operands                  Clocks   Transfers  Bytes   Example
   no operands                 2          -        1     CLI
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