RS-232 C Plus Upgrade  (250-1014)    Installation     Faxback Doc. # 5169
Board

A major feature of the RS-232 C Upgrade Board is the way it is installed in
the computer. It plugs into the Memory PLUS Expansion Board (25-1011), which,
in turn, plugs into one of three option slots on the computer's main circuit
board. This piggyback feature lets you save the remaining two option slots
for other option boards.

We highly recommend that you have the RS-232 and Memory Boards installed by
the service technicians at your Radio Shack Service Center. Doing so not only
ensures expert installation, but also enables the technicians to quickly
check to be sure all the equipment is functioning properly.

If, however, you DO decide to install the boards yourself, follow the in-
structions below exactly.

Before beginning, be sure you have the following equipment:

* Tandy 1000 RS-232 C PLUS Upgrade Board
* Tandy 1000 Memory PLUS Expansion Board (sold separately)
* Installation guide included with the Memory PLUS Board

INSTALLING THE BOARD:

CAUTION: Do not stand on carpeted floor during this procedure. Walking on
carpets promotes the build-up of static electricity, which, if discharged
while you are handling a circuit board, can destroy integrated circuits
(IC's) on the board.

1. If your Memory PLUS Expansion Board is already installed, remove it by
   following these condensed instructions: Turn off your computer, disconnect
   all equipment, remove the computer's cover, discharge any built-up static
   electricity by touching a grounded metal object, unscrew the bracket, and
   remove the board. Remember to wait at least 10 seconds between turning off
   the computer and removing the board.

2. Depending on the amount of memory you are installing, you might need to
   remove the jumper on your Memory Board and add memory IC's to the board.
   If so, perform these steps now so that you do not need to remove the
   RS-232 Board later. The RS-232 Board, once installed, covers the jumper
   pins. See your Memory PLUS Expansion Board Installation Guide for informa-
   tion on reconfiguring the jumper and installing the IC's.

3. Discharge any built-up static electricity by touching a grounded, metal
   object.

4. The Memory Board comes with a solid, metal bracket. To install the RS-232
   Board, you must replace this bracket with the one supplied with the RS-232
   Board. Loosen and remove the two screws that secure the solid bracket.
   (See Figure 1.) Remove the bracket and save it for possible later use.

5. Attach the bracket that has the cutout to the Memory Board. Secure it with
   the screws that held the original bracket. Do not over tighten the screws.

6. Packaged with the RS-232 Board are three white nylon stand-offs used to
   help support the upgrade board. Insert one end of each stand-off into one
   of the holes on the RS-232 Board, as shown in Figure 2. Although the two
   ends of the stand-offs are shaped differently, it does not matter which
   end you attach to the RS-232 Board.

7. Hold the RS-232 Board at a slight angle to the Memory Board so its cable
   connector fits into the cutout.

8. Carefully align the RS-232 Board's socket connector over the row of pins
   on the Memory Board, as shown in Figure 3. Then, slowly lower the board
   onto the pins, maintaining the alignment so the pins go into the corre-
   sponding holes on the socket. If you encounter any resistance, stop. DO
   NOT force the board. It might have a bent pin that requires straightening
   by a Radio Shack technician.

9. Snap each stand-off into the corresponding hole on the Memory Board by
   applying pressure to the RS-232 Board.

10.Using the two screws provided, secure the cable connector socket to the
   mounting bracket, as shown in Figure 4.

11.Referring to your Memory PLUS Expansion Board Installation Guide, install
   the combination board. Put the cover on your computer, re-connect all
   equipment, and test the memory of your board.

12.Plug the cable from your serial device into the cable connector on the
   combination board. See your application and device manuals for informa-
   tion about using your specific serial device.

(css 08/03/93)