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