Bitfields for Intel 82371/82378/82379 SMI Enable Register:
Bit(s)	Description	)
 15-9	reserved
 8	(82371SB only) Legacy USB SMI enable
 7	APMC Write SMI enable
	=1 generate SMI on write to PORT 00B2h
 6	EXTSMI# SMI enable
 5	Fast-Off Timer SMI enable
 4	IRQ12 (PS/2 mouse) SMI enable
 3	IRQ8 (RTC alarm) SMI enable
 2	IRQ4 (COM1/COM3) SMI enable
 1	IRQ3 (COM2/COM4) SMI enable
 0	IRQ1 (keyboard) SMI enable
SeeAlso: #01064,#01079,#01081,#01167,PORT 00B2h