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Document Title: [tank.txt (text file)]

Tank Pinouts
Kee Games, August 1974

I believe these two boards are tightly back-to-back, and the edge connector
on each forms a single, double-sided edge connector.  The manual warns that
the two boards should not be pried apart.

                      Board I (J-3)    Board II (J-6)
        (From Transformer?) Gnd   1   1   Gnd (Left Joysticks Common)
                        LO - AC   2   2   Analog Gnd (to J-3, pin 7)
                        LO - AC   3   3   (Not Used)
                        HI - AC   4   4   (Not Used)
                        HI - AC   5   5   (Not Used)
     (Speaker 1 & 2 Common) Gnd   6   6   (Not Used)
          (from J-6, pin 2) Gnd   7   7   (Not Used)
                     (Not Used)   8   8   (Not Used)
                            Ant   9   9   (Not Used)
                            +5V  10   10  P2 Left Joystick, Down
                    Coin 2 - NC  11   11  P2 Right Joystick, Down
                    Coin 2 - NO  12   12  P2 Left Joystick, Up
                    Coin 1 - NC  13   13  P2 Right Joystick, Up
                    Coin 1 - NO  14   14  (Not Used)
                           -12V  15   15  P1 Left Joystick, Down
                     Speaker 2+  16   16  P1 Right Joystick, Down
                     Speaker 1+  17   17  P1 Left Joystick, Up
                     (Not Used)  18   18  P1 Right Joystick, Up
                     (Not Used)  19   19  P2 Button
                   Coin Counter  20   20  P1 Button
     (Speaker 1 & 2 Common) Gnd  21   21  Video
        (Coin 1 & 2 Common) Gnd  22   22  Gnd (from Video)

I have no idea what "Ant" is.  The schematic doesn't show it going to

Only these adjustments should be made on circuit board 1.

1) Master volume: Look in upper right area of board.  There is a small tab
on each of the pots.  When the two tabs are set to the same point, the
volume for both tanks will be the same.

2) Missile firing and explosion sound: Look in the upper left area of the
board.  There are two pots here as well.  Setting the tabs to the same
point will set the volume evenly between the two tanks.

3) Game time: There is only one switch located on circuit board 1.  Next
to this switch is the pot that adjusts game time.  This pot is preset at
the factory: switch in the $0.25 position, one game costs a quarter and
will last 60 seconds.  With the switch in the $0.50 position, one game
costs two quarters and will last 120 seconds.  The pot can be used to
fine tune the time.

Do not attempt to adjust any other pots on these boards, as they are
factory adjustments and tampering with them may have detrimental effects
upon the game.