DTA: Memory
Memory
Memory Installation Guidelines
Base/Board Memory
Installing/Removing Memory
Upper-Memory Map
Conventional-Memory Map
Memory Installation Guidelines
The 4 SIMM sockets can accommodate from 8 to 128 MB of RAM.
Supported SIMM sizes are 4, 8, 16, and 32 MB.
SIMMs are 70 ns (fast-page mode).
SIMMs are 32-bit, nonparity.
SIMMs must be installed in matched pairs.
The number and arrangement of chips on the SIMM may vary.
The SIMMs used on this computer have tin leads.
SIMM Sockets
Base/Board Memory
Total SIMM1 SIMM2 SIMM3 SIMM4
8 MB 4 MB 4 MB
16 MB 4 MB 4 MB 4 MB 4 MB
16 MB 8 MB 8 MB
24 MB* 8 MB 8 MB 4 MB 4 MB
32 MB 8 MB 8 MB 8 MB 8 MB
32 MB 16 MB 16 MB
40 MB* 16 MB 16 MB 4 MB 4 MB
48 MB* 16 MB 16 MB 8 MB 8 MB
64 MB 16 MB 16 MB 16 MB 16 MB
64 MB 32 MB 32 MB
72 MB* 32 MB 32 MB 4 MB 4 MB
80 MB* 32 MB 32 MB 8 MB 8 MB
96 MB* 32 MB 32 MB 16 MB 16 MB
128 MB 32 MB 32 MB 32 MB 32 MB
* The SIMM pairs can be reversed.
Installing/Removing Memory
Installing/Removing a SIMM
1. Remove the cover.
2. To replace or reinstall a SIMM, align the SIMM with the slot in the center of the socket with the cutout
toward the back of the chassis and press slowly upward until the SIMM snaps into place.
NOTE: To remove a SIMM, follow the instructions in reverse order.
Upper-Memory Map
Location Size Description
FFFF0000-FFFFFFFF 64 KB BIOS ROM
08000000-FFFEFFFF Reserved
0010FFF0-07FFFFFF 126.9 MB Extended memory
00100000-0010FFEF 64 KB High-memory area
000F0000-000FFFFF 64 KB System BIOS
000C8000-000EFFFF 160 KB Available
000C0000-000C7FFF 32 KB Video BIOS
000A0000-000BFFFF 128 KB Video RAM
0009FC00-0009FFFF 1 KB PS/2-mouse data area
00000000-0009FBFF 639 KB Conventional memory
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-9FBFFh User memory
9FC00h-9FFFFh PS/2-mouse data area
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