Dell Inspiron 3800 User Manual
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provides a map of the upper memory area. Some of these addresses are dedicated to various system devices, such as the system/video
basic input/output system (BIOS). Others are available for use by expansion cards and/or an expanded memory manager (EMM).
When the microprocessor or a program addresses a location within the upper memory area, it is physically addressing a location within one of
these devices.
Table 5. Upper Memory Map
I/O Memory Map
provides a map of memory addresses reserved by the system for peripheral I/O devices. Use the information in Table 6 to determine if the
memory address of an external peripheral (such as a PC Card) conflicts with a memory address reserved by the computer.
Check the documentation of the external I/O device to determine its memory address. If there is a conflict with a memory address reserved by the
computer, change the address of the device.
To view I/O addresses in Windows 98, click the Start button, point to Settings, and click Control Panel. Double-click the System icon. Click the
Device Manager tab, and then double-click Computer.
To view I/O addresses in Windows NT, start the Windows NT Diagnostics in the Administrative Tools (Common) folder.
To view I/O addresses in Windows 2000, click the Start button, point to Settings, and click Control Panel. Double-click the System icon. Click
the Hardware tab, and then click Device Manager.
Table 6. I/O Memory Map
00500h-005FFh
MS-DOS
® and BASIC work area
00600h-9FBFFh
User memory
Address Range
Use
0009FC00-0009FFFF
PS/2-mouse data area
000A0000-000BFFFF
Video random-access memory (RAM)
000C0000-000CFFFF
Video BIOS
000CC000-000CDFFF
Reserved for PC Card
000F0000-000FFFFF
System BIOS
00100000-03FFFFFF
High memory area
FD000000-FDFFFFFF
Video RAM
FF200000-FF2FFFFF
Video RAM
FFFE0000-FFFFFFFF
BIOS ROM
Address
Device
0000-001F
DMA controller #1
0020-003F
Interrupt controller #1
0040-005F
System timers
0060-006F
Keyboard controller
0070-007F
RTC and nonmaskable interrupt (NMI) enable
0080-009F
DMA page registers
00A0-00BF
Interrupt controller #2
00C0-00DF
DMA controller #2
00F0-00FF
Math coprocessor
0170-0177
CD-ROM drive controller
01F0-01F7
Hard-disk drive controller
0210-0217
Audio controller
0220-022F
Audio controller
0270-0277
Fast IR
0376-0376
Integrated drive electronics (IDE) controller
0378-037F
LPT1