Service manual

Troubleshooting Your Computer: Dell Latitude CP
NOTE: To view memory allocations in Windows 95, select the Start button, and point to
Settings and then to Control Panel. Double-click the System icon. Select the Device Manager
tab, and then Double-click Computer.
Table 3-5. Conventional Memory Map
Address Range Use
0000h-003FFh Interrupt vector table
00400h-00FFFF BIOS data area
00500h-005FFh MS-DOS® and BASIC work area
00600h-9FBFFh User memory
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 3-6 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 3-6. Upper Memory Map
Address Range Use
0009FC00-0009FFFF PS/2-mouse data area
000A0000-000BFFFF Video RAM
000C0000-000CBFFF Video BIOS
000CC000-000CDFFF Reserved for PC Card
000F0000-000FFFFF System BIOS
00100000-03FFFFFF High memory area
FD000000-FDFFFFFF Video RAM
file:///I|/SERVICE%20MANUALS/DELL%20MANU...0REF%20AND%20TROUBLESHOOTING/TROUBLE.HTM (21 of 45)6/21/2004 1:38:41 AM