PORTIBM PC Portable (uses same BIOS as XT) B6E8-B6E9 - 8514/A and compatible - BACKGROUND MIX
Notes:	supported by ATI Mach8 and Mach32 chipsets
	supported by S3 chipsets when PORTIBM PC Portable (uses same BIOS as XT) 03D4h register 40h bit 0 is set
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) BAE8h,PORTIBM PC Portable (uses same BIOS as XT) BEE8h,PORTIBM PC Portable (uses same BIOS as XT) B2E8h

B6E8w -W  drawing control: background mix (see #P1046)
Note:	this register may be read on S3 chipsets