Epson 486SX - Manual (Page 116)

Memory Modules
Your computer comes with 4MB of memory soldered onto the
memory card in your computer. By installing SIMMs (single
inline memory modules) on this card, you can increase the
amount of memory in your computer up to 16MB.
Caution
It is best to have your dealer install memory modules for
you because they can be damaged easily if installed
incorrectly. If you prefer, you can install your own SIMMs
by carefully following the instructions in this section.
Before you install SIMMs, check the following guidelines to
ensure that they will work properly:
Use SIMMs that operate at 80ns (nanosecond) or faster
access speed. Be sure all the SIMMs you install have the
same access speed.
Use the correct SIMM configuration to add the amount of
memory you want. See the table on the next page.
Once you have the SIMMs you need, you or your dealer can
install them in your computer. If you want to install them
yourself, follow the instructions below.
Installing and Removing Options 6-13