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

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