IBM 2289, 6824 manual DMA channel Data width System resource

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Appendix D. Interrupt request and direct memory access channel assignments

	The following tables list the IRQ and DMA 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.

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. 2002

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Contents User Guide Type 2289 Page User Guide Type 2289 Page Appendix B. Manual modem Iv User Guide To connect To disconnect Safety InformationConnexion Déconnexion Lithium battery noticeModem safety information Consignes de sécurité relatives au modem Laser compliance statementViii User Guide Information resources OverviewUser Guide Features Installing optionsAudio subsystem Security features Specifications Handling static-sensitive devices Available optionsTools required Installing external options Locating the connectors on the front of your computer Locating the connectors on the rear of your computer Obtaining device drivers Connector DescriptionRemoving the cover Identifying parts on the system board Locating componentsInstalling memory What to do next Installing adapters Installing internal drives Drive specifications Installing a drive Connecting the first IDE CD-ROM drive or DVD-ROM drive Physical security Connecting an additional IDE CD-ROM drive or DVD-ROM driveChanging the battery Replacing the cover and connecting the cables Erasing a lost or forgotten password clearing Cmos Installing options User Guide Starting the IBM Setup Utility program Using the IBM Setup Utility programViewing and changing settings Exiting from the IBM Setup Utility programAdministrator password User passwordSetting, changing, and deleting a password Using Security Profile by DeviceChanging the startup device sequence Selecting a startup deviceSelecting a temporary startup device User Guide Updating flashing Bios from your operating system Updating flashing Bios from a disketteAppendix A. Updating System Programs System programsRecovering from a POST/BIOS update failure Basic AT commands Appendix B. Manual modem commandsExtended AT commands Enable RTS/CTS hardware flow control Guard tone disabledUS setting for off-hook-to-on-hook ratio Force DSR Signal High onFax Class 2 commands MNP/V.42/V.42bis/V.44 commandsFax Class 1 commands Voice commands User Guide System memory map Appendix C. System address mapsAddress map Address range Address range hex Size Description DecimalLPT3 Address hex Description Bits Byte pointer DMA I/O address mapAddress hex Description Bits Byte pointer DMA channel Data width System resource System resourceUser Guide Television output notice Appendix E. NoticesIBM TrademarksDVD IndexPage Page Part Number 49P1040