PORTIBM PC Portable (uses same BIOS as XT) 04D4-04D6 - 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 control Note: PORTIBM PC Portable (uses same BIOS as XT) 04D6h is also supported by the Intel 82378ZB System I/O controller 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) 04D0h-04D1h"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)." 04D4 R- DMAsee Direct Memory Access chaining status 04D4 -W extended DMAsee Direct Memory Access chaining mode register, channels 4-7 (see #P0893) 04D6 -W DMAsee Direct Memory Access extended mode register for channels 4-7 (see #P0894) bit settings same as PORTIBM PC Portable (uses same BIOS as XT) 040Bh Bitfields for 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). extended DMAsee Direct Memory Access chaining mode register (channels 4-7): Bit(s) Description (Table P0893) 7-5 reserved (0) 4 =0 generate IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. 13 =1 generate terminal count 3 =0 do not start chaining =1 programming complete 2 =0 disable buffer chaining mode (default) =1 enable buffer chaining mode 1-0 DMAsee Direct Memory Access channel select SeeAlso: #P0884,#P0894 Bitfields for 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 extended mode register (channels 4-7): Bit(s) Description (Table P0894) 7 =0 enable stop register 6 =0 terminal count is an output for this channel (default) 5-4 DMAsee Direct Memory Access cycle timing 00 ISA-compatible (default) 01 type A timing mode 10 type B timing mode 11 burst DMAsee Direct Memory Access mode 3-2 Address mode 00 8-bit I/O, count by bytes (default) 01 16-bit I/O, count by words, address shifted 10 32-bit I/O, count by bytes 11 16-bit I/O, count by bytes 1-0 DMAsee Direct Memory Access channel select SeeAlso: #P0886,#P0893