Epson Action Laser II - Manual (Page 222)

The Memory Expansion Board
Installing RAM chips on the memory board
There are four sectors on the memory board, each with four chip
sockets, as shown below.
There are three ways to install chip sets on this board.
0.5MB chip sets in blocks A, B, C, and D
A 2.0MB chip set in block A, and 0.5MB chip sets in blocks B, C,
and D
2.0MB chip sets in blocks A and B, and 0.5MB chips sets in blocks
C and D
A-14 Options