MEM FEC00000h - Pentium - 82379AB I/O APIC - I/O REGISTER SELECT                
Size:	DWORDDoubleword; four bytes.	 Commonly used to hold a 32-bit segment:offset or selector:offset address.
Desc:	bits 7-0 of the I/O Register Select memory location specify which
	  of the APIC's registers appears in the I/O Window at FExxx010h
Range:	the Multiprocessor Specification calls for I/O APICs to be memory-
	  mapped on 4K boundaries between FEC00000h and FEDFC000h; the Intel
	  82379AB I/O APIC can be memory-mapped on any 1K boundary within
	  FEC0000h-FEC0F800h
Note:	this memory-mapped register is also supported by the Intel 82093AA
	  I/O APIC
SeeAlso: MEM FEC00010h,MEM FEE00000h,MEM xxxxh:xxx0h"Multiprocessor"