PORTIBM PC Portable (uses same BIOS as XT) 04C6-04CF - 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). DMAsee Direct Memory Access count registers SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0401h-040Bh"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).",PORTIBM PC Portable (uses same BIOS as XT) 0481h-048Bh"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).",PORTIBM PC Portable (uses same BIOS as XT) 04E0h-04FFh"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)." 04C6 RW DMAsee Direct Memory Access channel 5 word count byte 2 (high) 04CA RW DMAsee Direct Memory Access channel 6 word count byte 2 (high) 04CE RW DMAsee Direct Memory Access channel 7 word count byte 2 (high)