TANK Manufacturer: Kee Games Year: 1974 Genre: Labyrinth/Maze Orientation: Horizontal Conversion Class: See Pinouts DIP Switch Settings and PIN Outs: Tank Pinouts 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 anything. 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.