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