Memory
Flash EPROM
Fast Video BIOS
Fast System BIOS
EMS Memory
Extended Memory
Expanded Memory Manager
Memory Upgrade Kits
Configuring Memory
Installing 1 MB Memory Module
Memory Module Connectors
Memory Modules: 1 & 2 MB
Memory: Built-in
Flash EPROM
A 128-KB CMOS flash memory is used to hold the system BIOS, video BIOS, and power management microcontroller firmware. This EPROM permits the system firmware to be updated after assembly and can be used to revise the system through the ROM BIOS Upgrade program. Additional space in the flash EPROM is used to store the system service tag number and subassembly numbers entered during the manufacturing of the computer.
Memory Map of Flash PROM
E0000h to E7FFFh 32 KB Video BIOS
E8000h to E9FFFh 8 KB Microcontroller firmware
EA000h to EFFFFh 24 KB Feature expansion
F0000h to F3FFFh 16 KB System Setup program
F4000h to FFFFFh 48 KB System BIOS
If the FAST VIDEO BIOS option is set to ON, the computer remaps the video BIOS to the C0000h to CFFFFh address range. The system BIOS and video BIOS can be shadowed in the System Setup program to improve the performance of BIOS routines.
Fast Video BIOS
ON = When the computer is booted and FAST VIDEO BIOS is set to ON, the computer copies the video BIOS ROM code to faster RAM memory (called shadowing). If the video BIOS is shadowed (ON setting), it appears at C0000h.
OFF = 32 KB is freed to be used by EMS MEMORY. Some older applications may require this option to be set to OFF if the application expects to find the video BIOS at a specific address.
If the video BIOS is not shadowed (OFF setting), it appears at E0000h.
Fast System BIOS
ON = When the computer is booted and the FAST SYSTEM BIOS is set to ON, the computer copies the system BIOS ROM code to faster RAM memory (called shadowing). Shadowing requires 64 KB of the available 384 KB between the 640 KB base memory and the end of the first megabyte.
OFF = 64 KB is freed to be used by EMS memory.
EMS Memory
Expanded memory support is used only by MS-DOS® applications adhering to the Lotus-Intel-Microsoft (LIM) specification; it is not used by applications running under OS/2® or UNIX®.
In the System Setup program, the EMS MEMORY category defaults to 288 KB. This cannot be decreased, but can be increased to 4480 KB, depending on how much memory is installed in the computer and how the FAST VIDEO BIOS and FAST SYSTEM BIOS categories are set. This category increases in 64-KB increments.
This table shows how the first megabyte of memory can be distributed via the System Setup program:
Base Fast System Fast Video EMS Extended
640 KB Off Off 384 KB N/A
640 KB 64 KB Off 320 KB N/A
640 KB Off 32 KB 352 KB N/A
640 KB 64 KB 32 KB 288 KB N/A
Extended Memory
Extended memory is memory beyond the first addressable megabyte. Up to 4 MB can be accessed as extended memory after the first megabyte.
In the System Setup program, the EXTENDED MEMORY category is not directly changeable. Instead, what is not being used by base memory, fast video BIOS, fast system BIOS, and whatever is left after choosing EMS memory is automatically used as extended memory.
Expanded Memory Manager
The Dell Software Support Diskette contains an Expanded Memory Manager (EMM) Utility that supports the LIM 4.0 specifications. Detailed information can be found in the User's Software Support Guide.
Memory Upgrade Kits
1-MB memory module 
maximum installable modules (1).
2-MB memory module maximum installable modules (2).
Configuring Memory
The Dell notebook computer memory modules are proprietary to the Dell® notebook series of computers.
Before installing or removing memory, be sure to remove the main battery.
There are 4 memory sockets available. A 1-MB memory module requires all 4 sockets, while a 2-MB memory module requires only 2 sockets. The memory module sockets are keyed to ensure correct installation.
1-MB memory module uses 8 (256-KB x 4) memory chips.
2-MB memory module uses 4 (1-MB x 16) memory chips.
If installing a single 2-MB memory module, install it in bank 1.