MSW - Machine Status Word (286+ only)

      |31|30-5|4|3|2|1|0|  Machine Status Word
	|   |  | | | | `---- Protection Enable (PE)
	|   |  | | | `----- Math Present (MP)
	|   |  | | `------ Emulation (EM)
	|   |  | `------- Task Switched (TS)
	|   |  `-------- Extension Type (ET)
	|   `---------- Reserved
	`------------- Paging (PG)


	Bit 0	PE	Protection Enable, switches processor between
			protected and real mode
	Bit 1	MP	Math Present, controls function of the WAIT
			instruction
	Bit 2	EM	Emulation, indicates whether coprocessor functions
			are to be emulated
	Bit 3	TS	Task Switched, set and interrogated by coprocessor
			on task switches and when interpretting coprocessor
			instructions
	Bit 4	ET	Extension Type, indicates type of coprocessor in
			system
	Bits 5-30	Reserved
	bit 31	PG	Paging, indicates whether the processor uses page
			tables to translate linear addresses to physical
			addresses

	- see	SMSW  LMSW