Epson ActionNote 866C User Manual page 90

Caution
Note that two holes in the socket are labeled "pin l." If
you are installing a processor chip directly in the socket,
insert pin 1 in the second row of holes from the right.
You will see an empty row of holes in the socket to the
right of the chip. If you are installing a processor on a
daughterboard, insert pin 1 in the outer row of holes.
7. When you are sure the microprocessor is positioned
correctly, gently push it straight into the socket, pressing
evenly on all sides.
Installing Optional Devices 4-21