Remember that with Pentium processors that use SIMMs, you have to install the SIMMs in pairs (for
example, two 16MB SIMMs and two 4MB SIMMs). On the other hand, 386 processors require sets
of four 30-pin SIMMs, but can support single 72-pin SIMMs. On 486 and Pentium II
processors, you can install single memory modules.
When installing SIMMs in a vertical slot, push them into the socket, then push
forward until the retaining clips fasten around the SIMM.
Three sockets are used to hold memory modules: vertical and slanted for SIMMs, and DIMM
for DIMMs. Since you might have to remove old memory chips to replace them with new ones,
well explain how to install and remove modules from these sockets. If there
aren't already SIMMs in the slots, you can tell whether they're slanted or vertical by
looking for the retaining clips. If they're about a quarter-inch behind the socket, the
socket is slanted. If the retaining clips are to the immediate right and left of the
socket, it's vertical.
Before you remove any RAM chips from their plastic packaging, touch the computers
case to ground yourself and discharge static electricity.
Removing. Use both hands to spread the two metal clips on each end of the SIMM
apart while gently pushing the SIMM forward, so it leans down. After the SIMM is slanted
at a 60-degree angle, pull it out at that angle.
Installing. Instead of trying to insert the SIMM by pushing it down, line
up the notch (on 72-pin SIMMS) and the pins with the socket and tilt the SIMM at a
60-degree angle to the socket. Keeping the SIMM at that angle, push it into the socket.
Push the SIMM in as far as it will go, then hinge the SIMM up, pushing down and over at
the same time. There will be some resistance when the SIMM reaches the metal holding
clips, but continue to push the SIMM until the clips lock. The SIMM should be absolutely
flat in the socket. Remove and reinstall if the module is not firmly locked into place.
Removing. Use both hands to spread the metal holding clips apart, then push the
SIMM forward until it is standing straight up. You then can easily pull the SIMM up and
out of the socket.
Installing. Push the SIMM directly down into the socket, making sure the
notch (on 72-pin SIMMs) and pins line up with the socket. Once the SIMM is as far down
into the socket as it will go, push it forward toward the metal holding clips. Continue
pushing until the clips lock. Remove and reinstall if the module is not securely locked.
HOW TO INSTALL:
Testing the memory (click here)