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ESC             Escape                               Flags: Not altered

ESC

    ESC lets you send instructions to an external coprocessor on the
    system bus. On the 80386 and earlier processors, this was usually
    a floating-point chip called a numeric (or math) coprocessor. The
    8086 and 8088 work with an Intel 8087 math coprocessor; the 80286
    and 80386 work with an 80287 or 80387 coprocessor. The 80486 DX
    has a math coprocessor, called the Floating-Point Unit (FPU), on
    the chip.

    Note:       In order to synchronize with the 8087 math
                coprocessor, WAIT instructions must precede all ESC
                instructions.  The 80286+ has automatic instruction
                synchronization, hence WAITs are not needed.


    Opcode
    The opcode for ESC begins with the 5-bit sequence "11011b". This
    sequence indicates that the rest of the opcode is an instruction
    meant for a coprocessor, as opposed to an instruction meant for
    the CPU.