IBM Partner Pavilion 6825, 6343, 6793 Following tables list the IRQ and DMA channel assignments

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Appendix D. Interrupt request and direct memory access channel assignments

The following tables list the IRQ and DMA channel assignments.

Table 4. IRQ channel assignments

IRQ	System resource

NMI	Critical system error

SMI	System-management interrupt for power management

0	Timer

1	Keyboard

2	Cascade interrupt from slave PIC

3	COM2 (some models only)

4	COM1

5	Available to user

6	Diskette controller

7	LPT1

8	Real-time clock

9	Video, ACPI

10	Available to user

11	Available to user

12	Mouse port

13	Math coprocessor

14	Primary IDE (if present)

15	Secondary IDE (if present)

Note: The default settings for COM 1 (IRQ 4), COM 2 (IRQ 3), and LPT 1 (IRQ 7) can be changed to another IRQ.

Table 5. DMA channel assignments

DMA channel	Data width	System resource

0	8 bits	Open

1	8 bits	Open

2	8 bits	Diskette drive

3	8 bits	Parallel port (for ECP or EPP)

4		Reserved (cascade channel)

5	16 bits	Open

6	16 bits	Open

7	16 bits	Open

© Copyright IBM Corp. 2001

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Contents Page Page Page Page Contents Index To connect To disconnect Safety InformationModem safety information Lithium battery noticeConsignes de sécurité relatives au modem Laser compliance statementViii User Guide How this book is organized About this bookInformation resources Identifying your computer OverviewUser Guide Microprocessor FeaturesExpansion Physical specifications small desktop model SpecificationsPhysical specifications desktop model Physical specifications microtower model Tools required Available optionsHandling static-sensitive devices Overview User Guide Locating the connectors on the front of your computer Installing external optionsUSB connector Locating the connectors on the rear of your computer User Guide Installing external options Obtaining device drivers Connector DescriptionRemoving the cover Installing internal options small desktop modelIdentifying parts on the system board Locating componentsInstalling DIMMs Installing memoryWhat to do next Installing adaptersInstalling internal options small desktop model What to do next Drive specifications Installing internal drivesInstalling a drive Installing a Rope Clip Replacing the cover and connecting the cables Installing internal options small desktop model User Guide Installing internal options desktop model Locating components Installing internal options desktop model Installing adapters Installing internal drives Drive specifications Installing a drive To connect the first IDE CD drive or DVD drive To connect an additional IDE CD drive or DVD drive Replacing the cover and connecting the cables Installing internal options desktop model User Guide Installing internal options microtower model Moving the power supply Installing internal options microtower model Installing memory Installing adapters User Guide Installing internal drives Installing a drive Installing internal options microtower model To connect the first IDE CD drive or DVD drive Installing a Rope Clip Replacing the cover and connecting the cables Installing internal options microtower model User Guide Using the IBM Setup Utility program Setting, changing, and deleting a password Administrator passwordErasing a lost or forgotten password clearing Cmos Changing the startup sequence Using Security Profile by DeviceOther settings in the IBM Setup Utility program Startup sequenceUser Guide Appendix A. Changing the battery User Guide Appendix B. Updating System Programs Recovering from a POST/BIOS update failureSystem programs User Guide System memory map Appendix C. System address mapsAddress map LPT3 COM1 DMA I/O address mapAddress hex Description Bits Byte pointer Following tables list the IRQ and DMA channel assignments User Guide Television output notice Appendix E. Notices and trademarksIBM TrademarksDMA IRQ IndexLocation 19, 31 Memory Page Part Number 25P4024