Advantech PPC-A84/A120-X5X User Manual page 40

You can install anywhere from 16 MB to 128 MB of on-board DRAM
memory using 16, 32, 64 or 128 MB 144-pin SODIMM (Small Outline
Dual In-line Memory Modules).
The procedure for installing SODIMM appears below. Please follow
these steps carefully.
1. Ensure that all power supplies to the system are switched Off.
2. Slip the SODIMM into the socket at a 45 degree angle and carefully
fit the bottom of the card against the connectors.
3. Gently push the SODIMM into a perpendicular position until the
clips on the ends of the SODIMM sockets snap into place.
4. Check to ensure that the SODIMM is correctly seated and all
connector contacts touch. The SODIMM should not move around
in its socket.
Note:
2 6 PPC-A84/A120 User's Manual
The modules can only fit into a socket one way and
their gold pins must point down into the SODIMM
socket.