PORTIBM PC Portable (uses same BIOS as XT) 0279 - Plug-and-Play - CONFIGURATION REGISTER
SeeAlso: PORTIBM PC Portable (uses same BIOS as XT) 0A79h

0279  -W  index into Plug-and-Play register set for Read Data Port and
	  Write Data Port I/O (see #P0550,#P0551)


(Table P0550)
Values for Plug-and-Play Card-Level Registers:
 00h	set Read Port address
	bits 9-2 of Read Data port address (bits 15-10 are always 0, bits 1-0
	  are always 11); valid Read Port addresses are 0203h-03FFh
 01h	serial isolation
 02h	configuration control
 03h	Wake command
	(specifies which card is accessed through configuration registers)
 04h	resource data
 05h	status
 06h	Card Select Number (CSN)
 07h	logical device number
	(selects which logical device on card is accessed at locations 30h-FFh)
	(see #P0551)
 08h-1Fh reserved
 20h-2Fh vendor-specific
Note:	there is one set of these registers per installed card
SeeAlso: #P0551


(Table P0551)
Values for Plug-and-Play Logical Device Registers:
 30h	activate
	bit 0: device is active on ISA(Industry-Standard Architecture) The expansion bus used by the IBMInternational Busiuness Machines PCIBM PC/ATIBM PC AT.  See also EISA. bus
	bits 7-1: reserved (0)
 31h	I/O range check
	bit 0: I/O Read Pattern select (if bit 1 set, then I/O reads return
		55h if this bit is set, AAh if this bit is clear)
	bit 1: I/O Range Check Enable: if set, all reads from device I/O
		  registers return 55h or AAh, depending on bit 0
	bits 7-2: reserved (0)
 32h-37h reserved
 38h-3Fh vendor-specific
 40h-44h 24-bit ISA(Industry-Standard Architecture) The expansion bus used by the IBMInternational Busiuness Machines PCIBM PC/ATIBM PC AT.  See also EISA. memory descriptor 0
 45h-47h reserved
 48h-4Ch 24-bit ISA(Industry-Standard Architecture) The expansion bus used by the IBMInternational Busiuness Machines PCIBM PC/ATIBM PC AT.  See also EISA. memory descriptor 1
 4Dh-4Fh reserved
 50h-54h 24-bit ISA(Industry-Standard Architecture) The expansion bus used by the IBMInternational Busiuness Machines PCIBM PC/ATIBM PC AT.  See also EISA. memory descriptor 2
 55h-57h reserved
 58h-5Ch 24-bit ISA(Industry-Standard Architecture) The expansion bus used by the IBMInternational Busiuness Machines PCIBM PC/ATIBM PC AT.  See also EISA. memory descriptor 3
 5Dh-5Fh reserved
 60h-6Fh I/O configuration registers 0-7
 70h-71h IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. channel select 0
 72h-73h IRQ(Interrupt ReQuest) A hardware line connected to the interrupt controller chip which signals that a CPU interrupt should be generated. channel select 1
 74h-75h DMAsee Direct Memory Access configuration registers 0-1
 76h-7Eh 32-bit memory range configuration register 0
 7Fh	 reserved
 80h-88h 32-bit memory range configuration register 1
 89h-8Fh reserved
 90h-98h 32-bit memory range configuration register 2
 99h-9Fh reserved
 A0h-A8h 32-bit memory range configuration register 3
 A9h-EFh reserved for logical device configuration
 F0h-FEh vendor-specific
 FFh	reserved
Note:	there is one set of these registers per logical device
SeeAlso: #P0550