MMPC Model 10/20 (250-1640/41) Memory Upgrades Faxback Doc. # 2520 Installing System Memory Your system has a minimum of 4MB of system memory, provided by a 4MB SIMM installed in a SIMM socket (Bank 0 on the main logic board. The maximum amount of memory that can be installed in the sockets is 64MB. The SIMM sockets on the main logic board support 32-or 36-bit 1MB, 2MB, 4MB, 8MB, and 16MB SIMMs. The computer requires SIMMs rated at 70 ns or faster. 4 Meg (1 x 32) bit SIMM Module NP Part # AX-2505138 8 Meg (2 x 32) bit SIMM Module NP Part # AX-2597220 > Note: Only 16MB SIMMs that use 4MB x 4 DRAMs are supported. Some applications include commands that you manage memory. Refer to the MS-DOS documentation to learn more about how the system can use memory. When determining upgrade amounts, consider the requirements of the applications you will be using. Refer to the following table to determine the number and type of SIMMs you need to install for an upgrade. Then, purchase the appropriate SIMMs. Use the procedure in this section to install the SIMMs. Refer to any documentation provided with the SIMMs for additional instructions. Retain the antistatic packaging in which the SIMMs are shipped. You can use the packaging to store any SIMMs you remove later. After installing the SIMMs, run the setup utility and press F2 to confirm that the new memory amount is recognized at system startup. System Memory Configurations The following table lists the number and type of SIMMs required for some popular memory configurations. The installation procedure follows the upgrade tables. Consult your computer dealer to learn about other supported memory configurations. ┌────────┬────────────────────────────────────────┬─────────────────┐ │Total │ Size SIMM Installed (MB) │ Interleave │ │Memory ├─────────┬─────────┬─────────┬──────────┤ Mode │ │(MB) │Bank 0 │Bank 1 │Bank 2 │Bank 3 │ │ ├────────┼─────────┼─────────┼─────────┼──────────┼─────────────────┤ │4 │ 4 │ 0 │ 0 │ 0 │ None │ │5 │ 4 │ 1 │ 0 │ 0 │ None │ │6 │ 4 │ 1 │ 1 │ 0 │ Two-Way │ │6 │ 4 │ 2 │ 0 │ 0 │ None │ │7 │ 4 │ 1 │ 1 │ 1 │ Two-Way │ │7 │ 4 │ 2 │ 1 │ 0 │ None │ │8 │ 4 │ 2 │ 1 │ 1 │ Two-Way │ │8 │ 4 │ 0 │ 2 │ 2 │ Two-Way │ │8 │ 4 │ 4 │ 0 │ 0 │ Two-Way │ │8 │ 8 │ 0 │ 0 │ 0 │ None │ │9 │ 4 │ 1 │ 2 │ 2 │ Two-Way │ │9 │ 4 │ 4 │ 1 │ 0 │ Two-Way │ │9 │ 8 │ 1 │ 0 │ 0 │ None │ │10 │ 4 │ 2 │ 2 │ 2 │ Two-Way │ │10 │ 4 │ 4 │ 1 │ 1 │ Two-Way │ │10 │ 4 │ 4 │ 2 │ 0 │ Two-Way │ │10 │ 8 │ 0 │ 1 │ 1 │ Two-Way │ │10 │ 8 │ 2 │ 0 │ 0 │ None │ │11 │ 4 │ 4 │ 2 │ 1 │ Two-Way │ │11 │ 8 │ 1 │ 1 │ 1 │ Two-Way │ │11 │ 8 │ 2 │ 1 │ 0 │ None │ │12 │ 4 │ 4 │ 2 │ 2 │ Two-Way │ │12 │ 4 │ 4 │ 4 │ 0 │ Two-Way │ │12 │ 8 │ 2 │ 1 │ 1 │ Two-Way │ │12 │ 8 │ 0 │ 2 │ 2 │ Two-Way │ │12 │ 8 │ 4 │ 0 │ 0 │ None │ │13 │ 4 │ 4 │ 4 │ 1 │ Two-Way │ │13 │ 8 │ 1 │ 2 │ 2 │ Two-Way │ │13 │ 8 │ 4 │ 1 │ 0 │ None │ │14 │ 4 │ 4 │ 4 │ 2 │ Two-Way │ │14 │ 8 │ 2 │ 2 │ 2 │ Two-Way │ │14 │ 8 │ 4 │ 1 │ 1 │ Two-Way │ │14 │ 8 │ 4 │ 2 │ 0 │ None │ │15 │ 8 │ 4 │ 2 │ 1 │ None │ │16 │ 4 │ 4 │ 4 │ 4 │Four-Way │ │16 │ 8 │ 4 │ 2 │ 2 │ Two-Way │ │16 │ 8 │ 0 │ 4 │ 4 │ Two-Way │ │16 │ 8 │ 8 │ 0 │ 0 │ Two-Way │ │16 │ 16 │ 0 │ 0 │ 0 │ None │ │17 │ 8 │ 1 │ 4 │ 4 │ Two-Way │ │17 │ 8 │ 8 │ 1 │ 0 │ Two-Way │ │17 │ 16 │ 1  │ 0 │ 0 │ None │ │18 │ 8 │ 2 │ 4 │ 4 │ Two-Way │ │18 │ 8 │ 8 │ 1 │ 1 │ Two-Way │ │18 │ 8 │ 8 │ 2 │ 0 │ Two-Way │ │18 │ 16 │ 1 │ 1 │ 0 │ Two-Way │ │18 │ 16 │ 2 │ 0 │ 0 │ None │ │19 │ 8 │ 8 │ 2 │ 1 │ Two-Way │ │19 │ 16 │ 1 │ 1 │ 1 │ Two-Way │ │19 │ 16 │ 2 │ 1 │ 0 │ None │ │20 │ 8 │ 4 │ 4 │ 4 │ Two-Way │ │20 │ 8 │ 8 │ 2 │ 2 │ Two-Way │ │20 │ 8 │ 8 │ 4 │ 0 │ Two-Way │ │20 │ 16 │ 2 │ 1 │ 1 │ Two-Way │ │20 │ 16 │ 0 │ 2 │ 2 │ Two-Way │ │20 │ 16 │ 4 │ 0 │ 0 │ None │ │21 │ 8 │ 8 │ 4 │ 1 │ Two-Way │ │21 │ 16 │ 1 │ 2 │ 2 │ Two-Way │ │21 │ 16 │ 4 │ 1 │ 0 │ None │ │22 │ 8 │ 8 │ 4 │ 2 │ Two-Way │ │22 │ 16 │ 2 │ 2 │ 2 │ Two-Way │ │22 │ 16 │ 4 │ 1 │ 1 │ Two-Way │ │22 │ 16 │ 4 │ 2 │ 0 │ None │ │23 │ 16 │ 4 │ 2 │ 1 │ None │ │24 │ 8 │ 8 │ 4 │ 4 │ Two-Way │ │24 │ 8 │ 8 │ 8 │ 0 │ Two-Way │ │24 │ 16 │ 4 │ 2 │ 2 │ Two-Way │ │24 │ 16 │ 4 │ 4 │ 0 │ Two-Way │ │24 │ 16 │ 8 │ 0 │ 0 │ None │ │25 │ 8 │ 8 │ 8 │ 1 │ Two-Way │ │25 │ 16 │ 4 │ 4 │ 1 │ Two-Way │ │25 │ 16 │ 8 │ 1 │ 0 │ None │ │26 │ 8 │ 8 │ 8 │ 2 │ Two-Way │ │26 │ 16 │ 4 │ 4 │ 2 │ Two-Way │ │26 │ 16 │ 8 │ 1 │ 1 │ Two-Way │ │26 │ 16 │ 8 │ 2 │ 0 │ None │ │27 │ 16 │ 8 │ 2 │ 1 │ None │ │28 │ 8 │ 8 │ 8 │ 4 │ Two-Way │ │28 │ 16 │ 4 │ 4 │ 4 │ Two-Way │ │28 │ 16 │ 8 │ 2 │ 2 │ None │ │28 │ 16 │ 8 │ 4 │ 0 │ None │ │29 │ 16 │ 8 │ 4 │ 1 │ None │ │30 │ 16 │ 8 │ 4 │ 2 │ None │ │32 │ 8 │ 8 │ 8 │ 8 │Four Way │ │32 │ 16 │ 8 │ 4 │ 4 │ Two-Way │ │32 │ 16 │ 0 │ 8 │ 8 │ Two-Way │ │32 │ 16 │16 │ 0 │ 0 │ Two-Way │ │33 │ 16 │ 1 │ 8 │ 8 │ Two-Way │ │33 │ 16 │16 │ 1 │ 0 │ Two-Way │ │34 │ 16 │ 2 │ 8 │ 8 │ Two-Way │ │34 │ 16 │16 │ 1 │ 1 │ Two-Way │ │34 │ 16 │16 │ 2 │ 0 │ Two-Way │ │35 │ 16 │16 │ 2 │ 1 │ Two-Way │ │36 │ 16 │ 4 │ 8 │ 8 │ Two-Way │ │36 │ 16 │16 │ 2 │ 2 │ Two-Way │ │36 │ 16 │16 │ 4 │ 0 │ Two-Way │ │37 │ 16 │16 │ 4 │ 1 │ Two-Way │ │38 │ 16 │16 │ 4 │ 2 │ Two-Way │ │40 │ 16 │ 8 │ 8 │ 8 │ Two-Way │ │40 │ 16 │16 │ 4 │ 4 │ Two-Way │ │40 │ 16 │16 │ 8 │ 0 │ Two-Way │ │41 │ 16 │16 │ 8 │ 1 │ Two-Way │ │42 │ 16 │16 │ 8 │ 2 │ Two-Way │ │44 │ 16 │16 │ 8 │ 4 │ Two-Way │ │48 │ 16 │16 │ 8 │ 8 │ Two-Way │ │48 │ 16 │16 │ 16 │ 0 │ Two-Way │ │49 │ 16 │16 │ 16 │ 1 │ Two-Way │ │50 │ 16 │16 │ 16 │ 2 │ Two-Way │ │52 │ 16 │16 │ 16 │ 4 │ Two-Way │ │56 │ 16 │16 │ 16 │ 8 │ Two-Way │ │64 │ 16 │16 │ 16 │ 16 │Four-Way │ └────────┴─────────┴─────────┴─────────┴──────────┴─────────────────┘ Installing SIMMs Before you begin, carefully read the following steps and the documentation provided with the memory kit. To install SIMMs: 1. Turn off the computer, and disconnect all cables. 2. Discharge any accumulated static electricity from your body by touching a grounded metal object. Then, open the computer. Refer to "Opening the Computer." 3. If you have any full-length expansion adapters installed in the expansion slots, remove them to permit unhindered access to the SIMM sockets on the main logic board 4. Refer to the preceding memory upgrade table to determine where each SIMM should be placed. 5. Holding the SIMM by the edges, tilt it to a 45-degree angle from the main logic board. Press the metal-edged connector into the socket, and firmly seat the SIMM. Then, press the top edge of the SIMM toward the retaining clips until the SIMM latches into place: 6. Replace any full-length expansion adapters you may have removed earlier. 7. Close the computer. Refer to "Closing the Computer" and the "Getting Started" section. 8. Run the setup utility and press F2 to store the new memory amount. Refer to the "Utilities" section. Then, update the system worksheet. Removing SIMMs Before removing or rearranging SIMMs, refer to the memory upgrade tables in the section. Choose a suitable configuration from those listed. When removing SIMMs, begin with the socket nearest the back of the computer. Remove the back panel cables, and open the computer. Remove any adapters from the expansion slots. To remove a SIMM, open the remaining clips and push the top edge of the SIMM away from the clips until the SIMM is at a 45-degree angle from the main logic board. Then, pull the SIMM away from the board. Store the SIMM in an antistatic package. Close the computer. Refer to "Closing the Computer." Run the setup utility to store the new memory value. Then, update the system worksheet. (tmc-02/04/95)