Troubleshooting Your Computer
3-17
I/O Map
Table 3-7 provides a map of memory addresses reserved by
the system for peripheral I/O devices. Use the information in
Table 3-7 to determine if the memory address of an external
peripheral (such as a PC Card) conflicts with a memory
address 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 memory
address reserved by the system, change the address of the
device.
Table 3-6. Upper Memory Map
Address Range
Use
0009FC00–0009FFFF
PS/2-mouse data area
000A0000–000BFFFF
Video RAM
000C0000–000C7FFF
Video BIOS
000C8000–000CFFFF
Available
000D0000–000DBFFF
Reserved for PC Card
000F0000–000FFFFF
System BIOS
00100000–0010FFEF
High memory area
0010FFF0–1FFFFFFF
Extended memory
20000000–FFFBFFFF
Reserved
FFFC0000–FFFFFFFF
BIOS ROM
NOTE: For the full name of an abbreviation or acronym
used in this table, see the Glossary in the online System
User’s Guide.
Table 3-7. I/O Map
Address
Device
0020-003F
Interrupt controller #1
0040-005F
System timers
0060-006F
Keyboard controller
0070-0071
RTC and NMI enable
0080-009F
DMA page registers
00A0-00BF
Interrupt controller #2
00C0-00DF
DMA controller #2
00F0
Coprocessor busy clear
00F1
Coprocessor busy reset
00F8-00FF
Coprocessor
01F0-01F8
Hard-disk drive controller
0170–0178
CD-ROM controller
0200-0207
Joystick controller
0220-022F
Audio controller
0278-027F
LPT2
02F8-02FF
COM2
0378-037F
LPT1
03C0-03DF
VGA
03E0–03E1
PC Card controller
03F0-03F7
Diskette controller
03F8-03FF
COM1
NOTE: For the full name of an abbreviation or
acronym used in this table, see the Glossary in the
online System User’s Guide.
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