The Intel 8086 / 8088/ 80186 / 80286 / 80386 / 80486 Instruction Set
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E Instructions

ENTER - Make Stack Frame (80188+) 

        Usage:  ENTER   locals,level
        Modifies flags: None

        Modifies stack for entry to procedure for high level language.
        Operand "locals" specifies the amount of storage to be allocated
        on the stack.   "Level" specifies the nesting level of the routine.
        Paired with the LEAVE instruction, this is an efficient method of
        entry and exit to procedures.

                                     Clocks                     Size
        Operands         808x    286       386       486        Bytes

        immed16,0         -       11       10         14          4
        immed16,1         -       15       12         17          4
        immed16,immed8    -   12+4(n-1) 15+4(n-1)    17+3n        4

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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