PORTIBM PC Portable (uses same BIOS as XT) 0461-0462 - EISA(Enhanced Industry-Standard Architecture) A 32-bit superset of the IBMInternational Busiuness Machines ATIBM PC AT's expansion bus (which is now known as the ISA or Industry-Standard Architecture bus). NMIsee Non-Maskable Interrupt CONTROL

0461  RW  Extended NMIsee Non-Maskable Interrupt status/control register (see #P0890)
0462  -W  Software NMIsee Non-Maskable Interrupt register. writing to this register causes an NMIsee Non-Maskable Interrupt	if
	  NMIs are enabled
	bit 7 = 1  generates an NMIsee Non-Maskable Interrupt


Bitfields for EISA(Enhanced Industry-Standard Architecture) A 32-bit superset of the IBMInternational Busiuness Machines ATIBM PC AT's expansion bus (which is now known as the ISA or Industry-Standard Architecture bus). extended NMIsee Non-Maskable Interrupt status control register:
Bit(s)	Description	(Table P0890)
 7  R-	NMIsee Non-Maskable Interrupt pending from fail-safe (watchdog) timer
 6  R-	NMIsee Non-Maskable Interrupt pending from bus timeout NMIsee Non-Maskable Interrupt status
 5  R-	NMIsee Non-Maskable Interrupt pending from I/O port status
 4  R-	busmaster preemption timeout if bit 6 set
 3  RW	bus timeout NMIsee Non-Maskable Interrupt enable
 2  RW	fail-safe (watchdog) NMIsee Non-Maskable Interrupt enable
 1  RW	NMIsee Non-Maskable Interrupt I/O port enable
 0  RW	RSTDRV. bus reset
	=0  NORMAL bus reset operation
	=1  reset bus asserted