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Installing DRAM (SIMMs and DIMMs) You can install from 2 to 256 MB of any brand DRAM into your PCA-6155V. The card provides two 72-pin SIMM (Single In-line Memory Module) and two 168-pin DIMM (Dual In-line Memory Module) sockets. Each socket accepts 1, 4, 8, 16, 32 or 64 MB SIMMs, or 8 to 128 MB DIMMs. DIMMs can be used when the SIMM sockets are not used. Two sockets are available for 3.3 volt (power level) unbuffered synchronous DRAM (SDRAM) DIMMs or EDO DRAM DIMMs. Installing SIMMs Note: The modules can only fit into a socket one way. Their gold pins must point down into the SIMM socket. The procedure for installing SIMMs appears below. Please follow these steps carefully. 1. Ensure that all power supplies to the system are switched Off. 2. Install the SIMM card. Install the SIMM so that its gold pins point down into the SIMM socket. 3. Slip the SIMM into the socket at a 45 degree angle and carefully fit the bottom of the card against the connectors. 4. Gently push the SIMM into a perpendicular position until the clips on the ends of the SIMM sockets snap into place. 5. Check to ensure that the SIMM is correctly seated and all connector contacts touch. The SIMM should not move around in its socket. Installing DIMMs The procedure for installing DIMMs appears below. Please follow these steps carefully. The number of pins are different on either side of the breaks, so the module can only fit in one way. DRAM SIMM modules have the same pin contact on both sides. SDRAM DIMM modules have different pin contacts on each side, and therefore have a higher pin density. 1. Make sure the two handles of the DIMM socket are in the "open" position. i.e. The handles remain leaning outward. 2. Slowly slide the DIMM module along the plastic guides on both ends of the socket. 3. Press the DIMM module right down into the socket, until you hear a click.