.286p            Enable Protected Mode 80286 Instructions      MASM Directive

  .286p

    Enables assembly of 80286 protected mode instructions, as well as
    8086, 80186, and 80286 non-protected mode (real mode) instructions.

       Notes:     This directive should only be used for programs which
                  will only run in the protected mode of the 80286.

                  Place all Instruction set directives at the beginning of
                  the source file to insure that all instructions in the
                  file are assembled using the same microprocessor
                  instruction set.

                  See .286c for a directive which will generate code for
                  the real mode only of the 80286.