INT 2F CU - DOS 5+ - DOS SUPERVISOR "REBOOT PANEL" - ADJUST MEMORY SIZE
        AX = 4A06h
        DX = segment following last byte of conventional memory
Return: DX = segment following last byte of memory available for use by DOS
Desc:   used to override the default memory size when booting diskless
          workstations
Notes:  called by MS-DOS 5+ IO.SYS startup code if the signature "RPL" is
          present three bytes beyond the INT 2F handler; this call overrides
          the value returned by INT 12
        hooked by RPL code at the top of memory to protect itself from being
          overwritten; DOS builds a memory block with owner = 0008h and name
          "RPL" which must be freed by the RPL code when it is done
SeeAlso: INT 12

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