Bitfields for Intel 82443EX/LX (Device 0) PAC Configuration register:
Bit(s)	Description	)
 15	WSC# Handshake Disable
 14	(82443LX) Host Frequency (read-only)
	=1 60MHz
	=0 66MHz
 14	(82443EX) reserved
 13-12	reserved
 11	??? (Not documented by Intel!)
 10	PCI Agent to Arperture Access Disable
 9	Aperture Access Global Enable
 8-6	(82443EX) reserved
 8-7	(82443LX) DRAM Data Integrety Mode
	00  Non-ECC (no check, no correct)
	01  EC-only (do check, no correct)
	10  reserved
	11 ECC (do check, do correct)
 6	(82443LX) ECC-Test Diagnostic Mode Enabled
 5	MDA Present
	Note:	Controls routing of Monochrome Display Adaptor I/O and memory
		  range accesses. Works in conjunction with the VGA-bit in
		  Bridge Control register of device 1 (see #00901):
		    VGA MDA
		    0	0	MDA and VGA routed to PCI bus
		    0	1	reserved
		    1	0	MDA and VGA routed to AGP bus
		    1	1	VGA routed to AGP bus, MDA routed to PCI bus
 4-0	reserved
SeeAlso: #00901,#01129