Bitfields for Intel 82371MX Programmable Address Control registers:
Bit(s)	Description	)
 15-0	Programmable Address Control
Note:	This register selects a 16-bit I/O address range to be forwarded to
	  the Extended I/O Bus, if enabled in the Programmable Address Range
	  register.
SeeAlso: #01168,PORT xxxxh"Intel 82371"