SYMBOL LEGEND

        |
      --*--          Interconnection - Lines are to be connected together.


      --|--          Perpendicular Lines - NO connection between lines.


       |             Inverted Output - Indicates that signal output is        
       |o-                             True when low (logic 0, below .8 volts)
       | 6                             For reference purposes only.


        1|           Inverted Input  - Indicates that input signal is         
       -o|                             True when low (logic 0, below .8 volts)
         |                             For reference purposes only.


      +5<---         Vcc Connection - Line is to be connected to +5.


      GND<--         Logic Ground Connection - Line is to be connected to
                                               GROUND.


      --\/\/\--      Resistor - Value is noted above or below symbol unless
         330                    otherwise noted (see NOTE on sheet 2).


       --)|--        Capacitor - Value is noted above or below symbol unless
                                 otherwise noted.


       1|\ 2
      --| >o--       Inverter - 74LS04
        |/ (04)


      [A1] >---      External System Input - Signal is from PCjr I/O Connector.
                                             The label within the square
                                             brackets denotes the I/O connector
                                             pin number.


      --> [B26]      External System Output - Signal is to go to the PCjr I/O
                                              Connector.  The label within the
                                              square brackets denotes the I/O
                                              connector pin number.

      P2-48>---      External SASI Input - Signal is from SASI I/O Connector
                                           (50 pin).  The number following the
                                           dash (-) denotes the I/O connector
                                           pin number.


      --->P2-38      External SASI Output - Signal is to go to the SASI I/O
                                            Connector.  The number following
                                            the dash (-) denotes the I/O
                                            connector pin number.


      sh n           Signal continues on sheet n of the schematics.

                                                           Sheet 4 of 4