Dell PP01S User Manual page 121

Error Messages, IRQs, and Memory Assignments: Dell Latitude LS Portable Computers User's Guide
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 4. Upper Memory Map
Address Range
0009FC00-0009FFFF
000A0000-000BFFFF
000C0000-000CBFFF
000CC000-000CD7FF
000DC000-000DFFFF
000E8000-000FFFFF
00100000-03FFFFFF
FD000000-FDFFFFFF (approximate; not a fixed
location)
FF200000-FF2FFFFF (approximate; not a fixed location) Video RAM
FFF80000-FFFFFFFF
I/O Memory Map
Table 5 provides a map of memory addresses reserved by the computer for peripheral input/output (I/O) devices. Use the information in Table 5 to
determine if the memory address of an external device (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 a device's memory address conflicts with a memory address
reserved by the computer, change the address of the device.
NOTE: To view I/O addresses in Windows 95 and 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.
Table 5. I/O Memory Map
Address
0000-001F
0020-003F
0040-005F
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Use
PS/2-mouse data area
Video RAM
Video BIOS
3Com boot ROM
SMBIOS data area
System BIOS
High memory area
Video RAM
BIOS ROM
Device
DMA controller #1
Interrupt controller #1
System timers