Compaq EXS Series, EX Series manual ICH Fixed I/O Registers Port Register Name

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ICH Fixed I/O Registers cont

Port	Register Name
CF9h	Reset Control Register
A0h	Slave PIC ICW1 Init. Cmd Word 1 Register
	Slave PIC OCW2 Op Ctrl Word 2 Register
	Slave PIC OCW3 Op Ctrl Word 3 Register
A1	Slave PIC ICW2 Init. Cmd Word 2 Register
	Slave PIC ICW3 Init. Cmd Word 3 Register
	Slave PIC ICW4 Init. Cmd Word 4 Register
	Slave PIC OCW1 Op Ctrl Word 1 Register
A4h-A5h, A8h-A8h,	Aliased at A0h-A1h
ACh-ADh, B0h-B1h,
B4h-B5h, B8h-B9h,
BCh-BDh
B2h	Advanced Power Management Control Port Register
B3h	Advanced Power Management Status Port Register
C0h, C4h, C8h, CCh	Channel 4, 5, 6, 7 DMA Base and Current Address Register
C1h	Aliased at C0h
C5h	Aliased at C4h
C9h	Aliased at C8h
CDh	Aliased at CCh
C2h, C6h, CAh, CEh	Channel 4, 5, 6, 7 DMA Base and Current Count Register
C3h	Aliased at C2h
C7h	Aliased at C6h
CBh	Aliased at CAh
CFh	Aliased at Ceh
D0h	Channel 4-7 DMA Command Register
	Channel 4-7 DMA Status Register
D1h	Aliased at D0h
D4h	Channel 4-7 DMA Write Single Mask Register
D5h	Aliased at D4h
D6h	Channel 4-7 DMA Channel Mode Register
D7h	Aliased at D6h
D8h	Channel 4-7 DMA Clear Byte Pointer Register
D9h	Aliased at D8h
DAh	Channel 4-7 DMA Master Clear Register
DBh	Aliased at DAh
DCh	Channel 4-7 DMA Clear Mask Register
DEh	Aliased at DCh
DEh	Channel 4-7 DMA Write All Mask Register
DFh	Aliased at DEh
F0h	Coprocessor Error Register
170h-177h	PIO Mode Command Block Offset for Secondary Drive
	continued

6-4Specifications

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Contents Maintenance & Service Guide Maintenance & Service Guide Maintenance & Service Guide Contents Removal and Replacement Procedures Specifications About this Guide Symbols and ConventionsTechnician Notes Locating Additional Information Chapter Product DescriptionFront Panel Controls and LEDs Computer FeaturesComponent/Function Rear Panel Connectors ComponentReference Drive Bay Configuration Drive PositionsSerial Number Location Spare Parts Spare Part Warranty Description Number Tier System UnitMass Storage Devices Cables Standard, Memory, and Expansion Boards Miscellaneous Plastics Kit Keyboards not illustrated Miscellaneous Screw Kit not illustratedDocumentation and Software not illustrated Miscellaneous Parts not illustratedShipping Boxes not illustrated Description Spare Part NumberGenerating Static Removal & Replacement PreliminariesElectrostatic Discharge Information Relative Humidity Event 55% 40% 10%Grounding Workstations Preventing Electrostatic Damage to EquipmentPersonal Grounding Methods and Equipment Method VoltageRoutine Care General Cleaning Safety PrecautionsRecommended Materials and Equipment Cleaning the Keyboard Cleaning the Computer CaseCleaning the Monitor Power Supply Fan Service ConsiderationsCleaning the Mouse Tools and Software RequirementsLithium Coin Cell Battery Cables and ConnectorsHard Drives Removal and Replacement Procedures Disassembly Sequence ChartDisassembly Preparation Feet Installation Cable Lock Access Panel Front Bezel Power Button Subpanel and Bezel Blanks Power Switch Assembly Drive Positions Using the Cable-Select Feature with Ultra ATA Devices Removing an Internal 3.5-Inch Hard Drive Removing an External 5.25-Inch Drive Removing an External 3.5-Inch Drive Page Expansion Boards Expansion Board SlotsRemoving a PCI Expansion Board Installing a PCI Expansion Board Page System Memory Memory Module InstallationDIMMs Page Graphics Cards Installing a GPA/AIMM Card 24Removal & Replacement Procedures AGP Card with a Type I Retention Mechanism Removing an AGP Card13.3 GPA/AIMM Card with a Type 2 Retention Mechanism AGP Card with a Type 2 Retention Mechanism Standard AGP Expansion Card Processor 30Removal & Replacement Procedures System Board Battery Chassis Fan Assembly Power Supply Connectors and Jumpers Connectors and JumpersClearing Cmos Disabling or Clearing the Power-On and Setup Passwords Seagate, Quantum, and Western Digital Hard Drive Jumper SettingsDefinition Seagate Quantum Western Digital Maxtor Definition J50 J48 J46 J44 J42Specifications SpecificationsSystem Hardware IRQ System Function System InterruptsSystem DMA Hardware DMA System FunctionICH Fixed I/O Registers Port Register NameICH Fixed I/O Registers Port Register Name System Memory Map Size Memory Address System FunctionDrives MB Diskette DriveUltra ATA Hard Drives 10.0 GB 15.0 GBCD-ROM Drives 48X MaxCompaq Keyboard Scroll MouseIntel 3D Graphics Supported Graphics ResolutionsColor Depth Mode Bits/pixel Refresh Rate Hz NVIDIA M64 ProIndex 2Index