Troubleshooting Your Computer 3-17I/O MapTable 3-7 provides a map of memory addresses reserved bythe system for peripheral I/O devices. Use the information inTable 3-7 to determine if the memory address of an externalperipheral (such as a PC Card) conflicts with a memoryaddress reserved by the system.Check the documentation of the external I/O device to deter-mine its memory address. If there is a conflict with a memoryaddress reserved by the system, change the address of thedevice.Table 3-6. Upper Memory MapAddress Range Use0009FC00–0009FFFF PS/2-mouse data area000A0000–000BFFFF Video RAM000C0000–000C7FFF Video BIOS000C8000–000CFFFF Available000D0000–000DBFFF Reserved for PC Card000F0000–000FFFFF System BIOS00100000–0010FFEF High memory area0010FFF0–1FFFFFFF Extended memory20000000–FFFBFFFF ReservedFFFC0000–FFFFFFFF BIOS ROMNOTE: For the full name of an abbreviation or acronymused in this table, see the Glossary in the online SystemUser’s Guide.Table 3-7. I/O MapAddress Device0020-003F Interrupt controller #10040-005F System timers0060-006F Keyboard controller0070-0071 RTC and NMI enable0080-009F DMA page registers00A0-00BF Interrupt controller #200C0-00DF DMA controller #200F0 Coprocessor busy clear00F1 Coprocessor busy reset00F8-00FF Coprocessor01F0-01F8 Hard-disk drive controller0170–0178 CD-ROM controller0200-0207 Joystick controller0220-022F Audio controller0278-027F LPT202F8-02FF COM20378-037F LPT103C0-03DF VGA03E0–03E1 PC Card controller03F0-03F7 Diskette controller03F8-03FF COM1NOTE: For the full name of an abbreviation oracronym used in this table, see the Glossary in theonline System User’s Guide.
