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Chapter 2 Installation 15
Installing DRAM (DIMMs)
System Memory
The left edge of the PCM-6890B contains a socket for 168-pin dual
inline memory module (DIMM). The socket uses 3.3 V unbuffered
synchronous DRAM (SDRAM). DIMM is available in capacities of
16, 32, 64, 128, or 256 MB. The socket can be filled in the DIMM of
any size, giving your PCM-6890B single board computer between
16 and 258 MB of memory.
Supplementary information about DIMM
Your PCM-6890B can accept both regular and PC-100 SDRAM
DIMM Module(with or without parity). However. The PCM-6890B
can only accept PC-100 SDRAM Module.
Single-sided modules are typically 16 or 128MB; double-sided
modules are usually 32 or 256 MB.
Memory Installation Procedures
To install SDRAM, first make sure the two handles of the SDRAM
socket are in the "open" position. i.e. The handles remain outward.
Slowly slide the SDRAM module along the plastic guides on both
ends of the socket. Then press the SDRAM module right down
into the socket, until you hear a click. This is when the two handles
have automatically locked the memory module into the correct
position of the SDRAM socket. (See Figure below) To take away
the memory module, just push both handles outward, and the
memory module will be ejected by the mechanism in the socket.