ESC - Escape

        Usage:  ESC     immed,src
        Modifies flags: None

        Provides access to the data bus for other resident processors.
        The CPU treats it as a NOP but places memory operand on bus.

                                 Clocks                 Size
        Operands         808x  286   386   486          Bytes

        immed,reg         2   9-20    ?                   2
        immed,mem         2   9-20    ?                  2-4


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