Memory Expansion Adapter  (250-4027)  Installation      Faxback Doc. # 2018

If you have any doubts about your ability to perform any part of the
installation, have the service technicians at your Radio Shack Service Center
upgrade the memory for you. Installation by service technicians not only
ensures expert work but also enables the technicians to check to be sure all
equipment functions properly.

If you decide to upgrade the memory yourself, follow all instructions
carefully. Save these instructions, you will need it if you upgrade your
computer's memory again later.

Removing the SIMMs from the Main Logic Board:

Follow these steps to remove your existing memory:

1. Exercise caution in low humidity environments to prevent damage to
   electronic parts by static electricity. (Discharge any built-up static
   electricity by touching a grounded metal object before proceeding.)

2. Turn off all equipment. Be sure to turn off the power and disconnect the
   power cord from the back of the computer.

3. Remove the screws from the back panel of the main unit, and remove the
   computer's cover.

4. Locate Bank 0 on the main logic board.

5. Use both thumbs to spread the retaining latches that clamp the front
   SIMM (the SIMM that is farther from the keyboard connector) to the chip
   mount.

6. Move the SIMM forward toward the vertical position.

7. Then, use your index fingers to pull the SIMM away from the brackets.

8. Remove the back SIMM in the same manner.

Installing the memory on the expansion board:

1. After removing the SIMMs from the main logic board, you are ready to
   install memory on the expansion board.

2. Follow instruction in the memory configuration table in Faxback Doc. #
   2016. Make the appropriate settings.

Helpful Hints:

* Remember that the banks on the expansion board are not in numerical order.

* Because the SIMM sockets are at an acute angle, you need to work from left
  to right.

To install a SIMM, grasp it at both ends and insert it into the socket as
shown. Be sure the SIMM's connector is fully seated. Then, press backward and
down on the SIMM until it snaps into place.

Installing the Expansion Board in the Computer:

The Zero K Memory Expansion Board has its own expansion slot on the main
logic board. The slot it near the keyboard connector, at the back of the
computer.

Notice that the expansion board's metal bracket is designed to slide down the
narrow groove to the left of the keyboard connector and that you will secure
the board with the screw from the neighboring option board (or panel, if no
board is yet installed).

To install the memory expansion board:

1. Remove the screw that is securing the neighboring option board (or panel).
   Leave the board or panel in place.

2. With the memory expansion board's sockets facing toward the power supply
   (away from the other expansion slots), slide the bracket into the groove.
   Push the board's edge connector firmly into the expansion slot socket to
   be sure the board is fully seated.

CAUTION: Installing the expansion board backward can damage the main logic
         board as well as the expansion board.

3. Thread the screw through both brackets, and tighten it to secure the
   board(s).

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