User manual NEC POWERMATE ES 5250

[. . . ] Proprietary Notice and Liability Disclaimer The information disclosed in this document, including all designs and related materials, is the valuable property of NEC Computer Systems Division, Packard Bell NEC, Inc. (hereinafter "NEC CSD") and/or its licensors. NEC CSD and/or its licensors, as appropriate, reserve all patent, copyright and other proprietary rights to this document, including all design, manufacturing, reproduction, use, and sales rights thereto, except to the extent said rights are expressly granted to others. The NEC CSD product(s) discussed in this document are warranted in accordance with the terms of the Warranty Statement accompanying each product. [. . . ] If you need to replace the board, see "Removing the System Board -- Minitower" later in this chapter. Opening the chassis floor -- minitower A ­ Screw B ­ Top Edge of Floor C ­ Chassis Feet D ­ Chassis Floor Closing the Chassis Floor To close the chassis floor, proceed as follows. If the system board was partially slid out for access to board components, slide it back into the chassis using the two board handles. If the system board was removed, see "Replacing the System Board -- Minitower" for replacement procedures. Pivot the floor up against the chassis and press the floor against the chassis until the floor latches in place. Closing the floor also plugs the system board into the riser board. 5-20 Installing Options 3. Secure the floor to the chassis with the previously removed screw. Place the system unit upright and swivel the two chassis feet out, perpendicular to the system unit. Replace the left side cover (see "Replacing the Minitower Side Covers"). System Board Options This section describes how to change options on the system board. Procedures described in this section include: T adding memory modules T upgrading the processor T replacing the system board. The following figure shows the locations of the upgrade sockets on the system board. See Chapter 3 for the location of the system board jumper settings. System board sockets A ­ Processor Socket B ­ System Memory Upgrade Sockets Installing Options 5-21 Memory Upgrade Memory upgrades are installed into memory module sockets on the system board. Your system uses dual inline memory modules (DIMMs). The system board has two module sockets and supports up to 512 MB of non-ECC high-speed memory. The system supports 168-pin SDRAM modules in 32-, 64-, 128-, and 256-MB unbuffered PC100 memory configurations. Use the following guidelines in selecting DIMM types: T memory can be installed in one or two sockets T the size of the DIMMs can vary between sockets T the speed of the DIMMs must match or exceed the processor bus speed T single- and double-sided DIMMs are supported. To determine what configuration of DIMMs to use, see the table "Supported DIMMs. " For sample memory configurations, see the table "Sample DIMM Upgrade Paths. " To locate memory module sockets on the system board, see the previous figure "System board sockets. " To determine the memory you need to purchase for a memory upgrade, see "Checking System Memory. " 5-22 Installing Options Supported DIMMs DIMM Size 32 MB 64 MB 128 MB 256 MB Non-ECC Configuration 4 Mbit x 64 8 Mbit x 64 16 Mbit x 64 32 Mbit x 64 Sample DIMM Upgrade Paths* Total Memory 32 MB 64 MB 64 MB 128 MB 128 MB 256 MB 256 MB 512 MB DIMM 1 32 MB 32 MB 64 MB 64 MB 128 MB 128 MB 256 MB 256 MB 256 MB 128 MB 64 MB 32 MB DIMM 2 *The information in this table shows sample DIMM upgrade paths. It does not represent every combination of DIMMs supported in the system. Checking System Memory If you do not know how much memory is installed in your system, check the amount by using the following procedure. On the Windows 95, Windows 98, or Windows NT 4. 0 desktop, point to My Computer, and click the right mouse button. Installing Options 5-23 2. With the left mouse button, click Properties. The General tab shows the random access memory (RAM). This is the amount of system memory in your computer. In Windows 95 or Windows 98, you can also find the amount of memory by pointing to My Computer, clicking the right mouse button, and selecting the Performance tab. Removing a DIMM If your memory configuration requires the removal of a module, use the following steps. !CAUTION Before opening the computer or handling boards or memory modules, reduce static discharge by touching the system's metal chassis. 1. [. . . ] NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. [. . . ]