PORTIBM PC Portable (uses same BIOS as XT) 5EEE - ATI Mach32 - MEMORY APERTURE CONFIGURATION REGISTER
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 42EEh"Mach32"

5EEEw RW  Memory Aperture Configuration (see #P1023)


Bitfields for ATI Mach32 Memory Aperture Configuration Register:
Bit(s)	Description	(Table P1023)
 1-0	direct memory interface mapping
	00 disabled
	01 1M aperture (not on PCI)
	10 4M aperture
	11 reserved
 3-2	1M page select (not on PCI)
	00 page 0
	01 page 1
	10 page 2
	11 page 3
 11-8	(ISA(Industry-Standard Architecture) The expansion bus used by the IBMInternational Busiuness Machines PCIBM PC/ATIBM PC AT.  See also EISA.) memory aperture location, 0-15 MB
 13-8	(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).) memory aperture location, 0-63 MB
 14-8	(VLBVESA Local Bus) memory aperture location, 0-127 MB [*]
 15-4	(PCI) memory aperture location, 0-4095 MB
 13-8	(MCA 16-bit) memory aperture location, 0-63 MB
 14-8	(MCA 32-bit) memory aperture location, 0-127 MB
Note:	[*] if PORTIBM PC Portable (uses same BIOS as XT) 16EEh bit 3 is set and PORTIBM PC Portable (uses same BIOS as XT) FAEEh is non-zero, bits 15-4
	  are used to specify an address from 0-4095 MB