Epson EL 486UC - Manual (Page 65)

Installing External Cache
You can install either 32KB or 128KB of external cache on your
system. Use five DRAM, 28-pin, 8 x 8,20ns or 25ns DIP chips to
install 32KB or five 256 x 4,20ns DIP chips to install 128KB of
external cache on your system.
1. Locate the external cache sockets on the main system board,
shown on page 3-5.
2. If there is an option card in your way, remove it. See
page 3-17 for instructions.
Caution
To avoid generating static electricity and damaging the
cache chips, ground yourself by touching the metal
surface on the inside of the computer’s back panel. Then
remain as stationary as possible while you install them.
3. Remove the cache chips from their package and inspect
them. The pins should point inward at slightly less than a
90° angle.
If any of the pins are bent, straighten them gently with your
fingers or with small tweezers to align them with the other
pins. Be careful when you do this; the pins are fragile and
can break off easily.
3-22 Installing and Removing Options