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PUSHF            Push Flags onto Stack               Flags: not altered

          Logic:    SP . SP - 2
                    (SP) . flag-register

    PUSHF decrements SP by 2, then transfers the flags register to the new
    top of stack.

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   Operands                  Clocks   Transfers  Bytes   Example
   no operands                 14         1        1     PUSHF
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