Memory
Adding System Memory
Performing a Memory Upgrade
Base/Board Memory
Upper Memory Map
Conventional Memory Map
Cache Memory
Adding System Memory
Memory can be increased to a maximum of 64 MB by installing 4-, 8-, 16-, and/or 32-MB SIMMs in 2 SIMM sockets on the system board.
SIMMs and SIMM Sockets
Performing a Memory Upgrade
1. Remove the top and left-side computer covers.
2. Remove the system board. See Removing/Replacing the System Board.
3. Locate SIMM sockets.
4. Install or replace SIMMs, as necessary, to reach desired total.
See Installing/Removing SIMMs.
5. Replace the system board and computer covers, reconnect to power, and turn on.
After POST, the computer displays the total amount of SIMM memory installed.
NOTE: If the amount is incorrect, turn off and disconnect the computer, remove the covers, and make sure the SIMMs are seated properly in their sockets. Then repeat this step.
If the system detects that the new memory does not match the system configuration information in NVRAM,
the following error message appears:
The amount of system memory has changed.
Strike the F1 key to continue, F2 to run the setup utility.
6. Enter System Setup to check the setting of the SYSTEM MEMORY category.
7. If the total is still incorrect, check the SIMMs again to make sure they are properly installed.
8. When SYSTEM MEMORY is correct, insert the diagnostics diskette into drive A and reboot.
9. Run the RAM Test Group in the diskette-based diagnostics to test all installed SIMMs.
Base/Board Memory
Total SIMM_A SIMM_B
4 MB 4 MB
4 MB 4 MB
8 MB 4 MB 4 MB
8 MB 8 MB
8 MB 8 MB
12 MB 8 MB 4 MB
12 MB 4 MB 8 MB
16 MB 8 MB 8 MB
16 MB 16 MB
16 MB 16 MB
20 MB 16 MB 4 MB
20 MB 4 MB 16 MB
24 MB 16 MB 8 MB
24 MB 8 MB 16 MB
32 MB 16 MB 16 MB
32 MB 32 MB
32 MB 32 MB
36 MB 32 MB 4 MB
36 MB 4 MB 32 MB
40 MB 32 MB 8 MB
40 MB 8 MB 32 MB
48 MB 16 MB 32 MB
48 MB 32 MB 16 MB
64 MB 32 MB 32 MB
Upper Memory Map
Segment Address Range Description
A A0000h-AFFFFh Video memory
B B0000h-BFFFFh Video memory
C C0000h-C7FFFh Video BIOS
C8000h-CFFFFh Available
D D0000h-DFFFFh Available
E E0000h-EFFFFh Available
F F0000h-FFFFFh System BIOS
Conventional Memory Map
Segment Address Range Use
0 00000h-003FFh Interrupt vector table
00400h-004FFh BIOS data area
00500h-005FFh MS-DOS work area
00600h-0FFFFh User memory
1 10000h-1FFFFh User memory
2 20000h-2FFFFh User memory
3 30000h-3FFFFh User memory
4 40000h-4FFFFh User memory
5 50000h-5FFFFh User memory
6 60000h-6FFFFh User memory
7 70000h-7FFFFh User memory
8 80000h-8FFFFh User memory
9 90000h-9FFFFh User memory
Cache Memory
Systems with Intel486 SX or IntelSX2 microprocessors can be upgraded by installing 128 KB of cache memory (this memory is standard on systems with IntelDX2 and IntelDX4 microprocessors.)
See Installing Cache Memory.
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