Advantech PPC-100 Manual page 21

Installing DRAM (SIMM)
You can install from 2 MB to 32MB of DRAM memory . The PCM-4865
CPU card provides one 72-pin SIMM (Single Inline Memory Module)
socket.
Note: The modules can only fit into a socket one way. Their chips must
face the CPU, and their golden pins must point down into the SIMM
socket.
1. Ensure that all power sources are disconnected.
2. Slip the memory module into the socket at a 45degree angle
3. Push the module toward the vertical posts at both ends of the socket
until the module is upright, and the retaining clips at both ends of the
module click into place. When positioned correctly, the pins on top of
the vertical posts should correspond to the circular holes on the ends of
the module.
16 PPC-100 User's Manual