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IBM 2289, 6824 manual Appendix C. System address maps, System memory map, I/O address map

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Appendix C. System address maps

Appendix C. System address maps

The following charts represent how the hard disk stores different types of information. Address ranges and byte sizes are approximate.

System memory map

The first 640 KB of system board RAM is mapped starting at address hex 00000000. A 256-byte area and a 1 KB area of this RAM are reserved for BIOS data. Memory can be mapped differently if POST detects an error.

Address range		Address range (hex)	Size		Description
(decimal)

0 K – 512 KB		00000 – 7FFFF	512 KB		Conventional

512	K – 639 KB	80000 – 9FBFF	127 KB		Extended conventional

639	K – 640 KB	9FC00 – 9FFFF	1 KB		Extended BIOS data

640	K – 767 KB	A0000 – BFFFF	128 KB		Dynamic video memory display cache

768	K – 800 KB	C0000 – C7FFF	32	KB	Video ROM BIOS (shadowed)

800	K – 896 KB	C8000 – DFFFF	96	KB	PCI space, available to adapter ROMs

896	K – 1 MB	E0000 – FFFFF	128 KB		System ROM BIOS (main memory shadowed)

1 MB – 16 MB		1000000 – FFFFFF	15	MB	PCI space

16 MB – 4096 MB		10000000 – FFDFFFFF	4080 MB		PCI space (positive decode)

		FFFE0000 – FFFFFFFF	128 KB		System ROM BIOS

I/O address map

The following table lists resource assignments for the I/O address map. Any addresses that are not shown are reserved.

Address range (hex)		Size (bytes)	Description

0000	– 000F	16	DMA 1

0010	– 001F	16	General I/O locations, available to PCI bus

0020	– 0021	2	Interrupt controller 1

0022	– 003F	30	General I/O locations, available to PCI bus

0040	– 0043	4	Counter/timer 1

0044	– 00FF	28	General I/O locations, available to PCI bus

0060		1	Keyboard controller byte, reset IRQ

0061		1	System port B

0064		1	Keyboard controller, CMD/ATAT byte

0070, bit 7		1 bit	Enable NMI

0070, bits 6:0		6 bits	Real-time clock, address

0071		1	Real-time clock, data

0072		1 bit	Enable NMI

0072, bits 6:0		6 bits	RTC address

© Copyright IBM Corp. 2002

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IBM 2289, 6824 manual Appendix C. System address maps, System memory map, I/O address map

Contents

NetVista User Guide Type 2289 andPage NetVista User Guide Type 2289 andSecond Edition October Appendix A. Updating System iv User Guide DANGER Safety InformationTo avoid a shock hazard DANGERModem safety information Lithium battery noticeDanger of explosion if battery is incorrectly replaced Do notConsignes de sécurité relatives au modem Laser compliance statementviii User Guide DANGERInformation resources Overviewx User Guide Features Chapter 1. Installing optionsMicroprocessor MemoryInput/output features System management featuresPower Video subsystemIBM preinstalled software Security featuresOperating systems preinstalled varies by model type Operating systems tested for compatibility1This section lists the physical specifications for your computer SpecificationsTools required Available optionsHandling static-sensitive devices 6 User Guide Installing external options1and 2USB connectors Locating the connectors on the front of your computer8 User Guide Locating the connectors on the rear of your computerConnector Obtaining device driversDescription Removing the cover Identifying parts on the system board Locating components6Power supply 1Microprocessor and heat sinkInstalling memory What to do next 14 User Guide Installing adaptersWhat to do next Installing internal drivesDrive specifications Installing a drive 18 User Guide Connecting the first IDE CD-ROM drive or DVD-ROM driveConnecting an additional IDE hard disk drive Connecting an additional IDE CD-ROM drive or DVD-ROM drivePhysical security What to do nextWhat to do next Changing the battery1 Padlock loop 2 Integrated cable lock 3 Rope clip Replacing the cover and connecting the cables 22 User Guide Erasing a lost or forgotten password clearing CMOS9. Repeat steps 2 through 4 on page 24 User Guide Starting the IBM Setup Utility program Chapter 2. 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 DeviceSelecting a temporary startup device Selecting a startup deviceChanging the startup device sequence Chapter 2. Using the IBM Setup Utility program28 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 commandsATH ENTER 32 User Guide Extended AT commandsAppendix B. Manual modem commands Fax Class 1 commands MNP/V.42/V.42bis/V.44 commandsFax Class 2 commands 34 User GuideVoice commands #VTD #VTM #VTS #VTX #VBQ? #VBS #VBT #VCI? #VLS #VRA #VRN #VRX #VSDB #VSK #VSP #VSR #VSSSystem memory map Appendix C. System address mapsI/O address map Size bytes Address range hexDescription 38 User GuideAppendix C. System address maps DMA I/O address mapDescription Address hexBits Byte pointerThe following tables list the IRQ and DMA channel assignments Note The default settings for COM 1 IRQ 4, COM 2 IRQ 3, and LPT 1 IRQcan be changed to another IRQ 42 User Guide Television output notice Appendix E. NoticesIBM Director of Licensing IBM Corporation North Castle Drive Armonk, NY U.S.A44 User Guide TrademarksIndex A Page Page 1P P/N 49P1040 Part Number 49P1040 Printed in U.S.A