Acer M11E User Manual page 32

Figure 1-12 Installing the Pentium II Retention Mechanism
2. With the processor module golden fingers pointing downward, align
the processor to the posts of the retention mechanism then lower it
down. See Figure 1-8.
The golden fingers of the Pentium II module
are slotted such that it only fits in one
direction. Make sure that the module groove
matches the one on the processor socket.
1-16 User's Guide