Compaq EXS Series, EX Series manual System Interrupts, System DMA, Hardware IRQ System Function

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6.1.2System Interrupts

Hardware IRQ	System Function
0	Timer Interrupt
1	Keyboard
2	Interrupt Controller Cascade
3	Serial Port (COM B)
4	Serial Port (COM A)
5	Audio
6	Diskette Drive
7	Parallel Port (LPT 1)
8	Real-Time Clock
9	Available for PCI
10	Available for PCI
11	Available for PCI
12	Mouse
13	Coprocessor
14	Primary IDE Controller
15	Secondary IDE Controller

6.1.3	System DMA
	Hardware DMA	System Function
	0	Unused
	1	Unused
	2	Diskette Drive
	3	ECP Parallel Port LPT1 (Default; Alternate = DMA 0)
	4	DMA Controller Cascading
	5	Unused
	6	Unused
	7	Unused

6-2Specifications

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Contents Maintenance & Service Guide Maintenance & Service Guide Maintenance & Service Guide Contents Removal and Replacement Procedures Specifications Technician Notes Symbols and ConventionsAbout this Guide Locating Additional Information Chapter Product DescriptionComponent/Function Computer FeaturesFront Panel Controls and LEDs 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 illustratedMiscellaneous Parts not illustrated Shipping Boxes not illustratedDocumentation and Software not illustrated Description Spare Part NumberRemoval & Replacement Preliminaries Electrostatic Discharge InformationGenerating Static Relative Humidity Event 55% 40% 10%Preventing Electrostatic Damage to Equipment Personal Grounding Methods and EquipmentGrounding Workstations Method VoltageRecommended Materials and Equipment General Cleaning Safety PrecautionsRoutine Care Cleaning the Monitor Cleaning the Computer CaseCleaning the Keyboard Service Considerations Cleaning the MousePower Supply Fan Tools and Software RequirementsHard Drives Cables and ConnectorsLithium Coin Cell Battery 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 DIMMs Memory Module InstallationSystem Memory 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 Definition Seagate Quantum Western Digital Hard Drive Jumper SettingsSeagate, Quantum, and Western Digital Maxtor Definition J50 J48 J46 J44 J42System SpecificationsSpecifications System Interrupts System DMAHardware IRQ System Function 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 MouseSupported Graphics Resolutions Color Depth Mode Bits/pixel Refresh Rate HzIntel 3D Graphics NVIDIA M64 ProIndex 2Index