Dell PP01S technical specifications Upper Memory Map Address Range Use

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	Use
0009FC00-0009FFFF	PS/2-mouse data area
000A0000-000BFFFF	Video RAM
000C0000-000CBFFF	Video BIOS
000CC000-000CD7FF	3Com boot ROM
000DC000-000DFFFF	SMBIOS data area
000E8000-000FFFFF	System BIOS
00100000-03FFFFFF	High memory area
FD000000-FDFFFFFF (approximate; not a fixed	Video RAM
location)
FF200000-FF2FFFFF (approximate; not a fixed location)	Video RAM
FFF80000-FFFFFFFF	BIOS ROM

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	Device
0000-001F	DMA controller #1
0020-003F	Interrupt controller #1
0040-005F	System timers

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