|
|
| Caution | Only authorized service personnel should upgrade the system. Anyone who wants to upgrade the system herself/himself should know about the dangers of ESD (Electro-Static Discharge) and the necessary precautions. Unknowingly zapping the components of the computer will void the warranty. |
The 850 motherboard has four SIMM sockets configured as two (0-1) banks. The upgrade memory is upgradeable to 256MB. The 72-pin SIMM sockets will accept 1MBx32 (4MB), 2MBx32 (8MB), 4MBx32 (1632MB), and 8MBx32 (32MB) and 16MBx32 (64MB) Extended Data Out (EDO) or Fast Page Mode (FPM) DRAM SIMMs with the recommended access speed of 60ns or faster. This motherboard will accept either single or double sided SIMMs. Memory type, size, and speed can vary between banks, but cannot vary within each 2-socket bank. This motherboard will support 36 bit SIMM modules (parity).
The possible memory upgrade configurations are listed.
They can be installed in any order :
| SIMM Type (Amount) Bank 0 | SIMM Type (Amount) Bank 1 | Total System Memory |
|---|---|---|
| 1M x 32 (4 MB) | Empty | 8 MB |
| 1M x 32 (4 MB) | 1M x 32 (4 MB) | 16 MB |
| 1M x 32 (4 MB) | 2M x 32 (8 MB) | 24 MB |
| 1M x 32 (4 MB) | 4M x 32 (16 MB) | 40 MB |
| 1M x 32 (4 MB) | 8M x 32 (32 MB) | 72 MB |
| 1M x 32 (4 MB) | 16M x 32 (64 MB) | 136 MB |
| 2M x 32 (8 MB) | Empty | 16 MB |
| 2M x 32 (8 MB) | 1M x 32 (4 MB) | 24 MB |
| 2M x 32 (8 MB) | 2M x 32 (8 MB) | 32 MB |
| 2M x 32 (8 MB) | 4M x 32 (16 MB) | 48 MB |
| 2M x 32 (8 MB) | 8M x 32 (32 MB) | 80 MB |
| 2M x 32 (8 MB) | 16M x 32 (64 MB) | 144 MB |
| 4M x 32 (16 MB) | Empty | 32 MB |
| 4M x 32 (16 MB) | 1M x 32 (4 MB) | 40 MB |
| 4M x 32 (16 MB) | 2M x 32 (8 MB) | 48 MB |
| 4M x 32 (16 MB) | 4M x 32 (16 MB) | 64 MB |
| 4M x 32 (16 MB) | 8M x 32 (32 MB) | 96 MB |
| 4M x 32 (16 MB) | 16M x 32 (64 MB) | 160 MB |
| 8M x 32 (32 MB) | Empty | 64 MB |
| 8M x 32 (32 MB) | 1M x 32 (4 MB) | 72 MB |
| 8M x 32 (32 MB) | 2M x 32 (8 MB) | 80 MB |
| 8M x 32 (32 MB) | 4M x 32 (16 MB) | 96 MB |
| 8M x 32 (32 MB) | 8M x 32 (32 MB) | 128 MB |
| 8M x 32 (32 MB) | 16M x 32 (64 MB) | 192 MB |
| 16M x 32 (64 MB) | Empty | 128 MB |
| 16M x 32 (64 MB) | 1M x 32 (4 MB) | 136 MB |
| 16M x 32 (64 MB) | 2M x 32 (8 MB) | 144 MB |
| 16M x 32 (64 MB) | 4M x 32 (16 MB) | 160 MB |
| 16M x 32 (64 MB) | 8M x 32 (32 MB) | 192 MB |
| 16M x 32 (64 MB) | 16M x 32 (64 MB) | 256 MB |
Installing SIMMs (J16, J18, J19, J21)
The following is a procedure for installing SIMM modules into a SIMM socket.
Step 1:
Line up the SIMM module as illustrated in Figure 1, pin 1 is indicated by a small triangle on the motherboard. Insert the module into the socket at roughly a 45 degree angle. The SIMM module is keyed and can only be inserted one way.
Step 2:
Pivot the SIMM module up until it is at a 90 degree angle in relation to the motherboard. The locking tabs should snap into place when the SIMM is in the proper position as illustrated
in Figure 2.
| Figure 1 | ||
|---|---|---|
 |
||
| STEP 1 | STEP 2 | STEP 3 |
Once the SIMM modules are installed, the system will display the correct amount of memory, since the system automatically detects the amount installed; there are no jumper settings for memory configuration. The memory should be enabled and fully functional.