Epson Apex Product Support Bulletin page 27

Apex Computer - 640KB Memory Upgrade Procedure
Subject:
Date: 6/7/89
Page: 1 of 2
The Apex by Epson comes standard with 512KB of RAM memory. This can be
expanded to 640KB by installing additional RAM chips on the Apex memory
(piggyback) board in the I.C. sockets provided. The memory board is attached to
the CPU board. This upgrade requires 4 each 4464, 21464 or 41464 (4 x 64)
DRAM (150ns) which are available from Epson's Accessories Marketing department
S
(Tel. # 800 - 873 - 7766) and should also be available at local electronic component
suppliers.
1. Refer to section 5 of the Apex User's Guide (Installing Option Cards) for
information on removing and replacing the Apex top cover. Ensure that the AC
power is disconnected from the unit.
2. After the top cover is removed, unscrew the CPU board retaining screw and
disconnect the 5 connectors which are attached to the top of the CPU board.
Note the positions of the connectors for later reconnection. Refer to figure
1 for details of board and connector locations.
INSTALLATION INSTRUCTIONS
Figure 1
PSB No: S-0022A
Originator: REM 2%
POWER
SUPPLY