Serial/Parallel Board  (25-4034)    Installation      Faxback Doc. # 5485

1. Caution should be exercised in low humidity environments to prevent
   damage to electronic parts by static electricity being discharged through
   them. (Discharge any built-up electricity by touching a grounded metal
   object before proceeding further.)

2. Warning: Turn off all equipment. Turn the power off and disconnect the 
   power cord from the back of the computer. If the computer is on, you
   could damage the central processing unit, as well as your Serial/Parallel
   board.

3. Check the position of the Baud-Rate Generator jumper. It is set at the
   factory to connect pins E1 and E3 for the USA Standard. To set the
   Baud-Rate Generator to the International Standard connect pins E1 and E2
   with the jumper that connected E1 and E3. Then connect pins E3 and E4
   with a second jumper.

4. If you are installing this board in the Tandy 3000, install a jumper on
   E5 and E6 to set the parallel port as Port 2 (LPT2). Install a jumper
   on E8 and E9 to set the serial port as Port 2 (COM2).

5. If you are installing this board in the Tandy 1000 or Tandy 1200,
   install a jumper on E5 and E6 to set the parallel port as Port 2. If
   a serial board is not already installed we suggest that you set the
   jumper on E9 and E10 to set the serial port as Port 1 (COM1).

NOTE: The parallel port can be set as Port 1 (LPT1) by moving the jumper
      to connect pins E6 and E7.

NOTE: In order to resolve interrupt conflicts with other boards, disable the
      corresponding interrupt on the Rev. B Serial/Parallel board by removing
      the jumper from the corresponding interrupt staking pins as follows:

       INTERRUPT    STAKING PINS

          7         E11-E12
          5         E13-E14
          4         E15-E16
          3         E17-E18

Because of this, it is not recommended that 2 Rev. A Serial/Parallel Boards
be used in a computer.
 
6. Remove the screws from the back panel of the main unit. Remove the cover
   by sliding it toward the front of the unit, parallel to the computer.
   Your computer Owner's Manual contains illustrations on removing the
   cover.

7. Select any empty board edge connector and with a screw driver remove the
   screw from the slot cover. Tilt the slot cover away from you and lift
   the cover so that the tab clears the bottom of the slot. Store the cover
   in a safe place for possible future use.

8. Install the board by inserting the board edge into the connector. Install
   the screw (previously removed) and tighten it to secure the board. Do not
   overtighten the screw.

9. Before replacing the main unit's cover, check all connections and to be 
   sure all screws are tightened.

NOTE: See your Owner's Manual for particular steps in replacing the main
      unit cover.

You can now use the new Serial/Parallel board in your computer (See your 
Owner's Manual.)

(dkh-08/03/93)