Figure 3-4 Simplified Block Diagram

The circuitry in zone B1 and B2 is provided as the interface between the game PCB and a dollar bill acceptor. Either a Rowe or an ARDAC unit can be installed on the game cabinet. The output from this portion of the game PCB circuitry is the $ signal.

On sheet 2 of the schcmatic, the type-9316 countcr circuit configuration in zone C3 produces the bugle contribution to the game sounds. The IV and 2V are timing signals derived from the CLOCK signal generated by the crystal-controlled oscillator. The BUG 1 and BUG 2 signals provide timing sequences for producing tones that play the bugle cail at the start of the game sequence, and the "taps" melody at the end of the game.

The ROM device in location N6 stores the pictures of objects (except tanks) that will appear on the TV screen. The two type-9322 devices in locations K5 and L5 provide character rotation signals. The IC dcvices in locations H5 and J 5 produce the tank movement. The type-9316 device in location J3 produces shell movement. The collisions of tanks and shells with various objects are detected in the circuit configuration that includes the type-74153 device in location B2.

The type-9322 device in location B3 produces the signals that go to the chroma PCB mounted in the color TV monitor chassis.

3.4.4 CHROMA PCB: The four signals COLOR CODE 0, COLOR CODF 1, COLOR CODE 1 and COLOR CODE 3 coming from the game PCB are decoded by a type-74145 device to produce eight individual outputs, one for each color of tank. Each output^ is coupled through a resistor weighted network to the B, R and G inputs to 2N3643 transistors. The B (blue), R (red) and G (green) signals at the collectors of these transistors are sent to the TV monitor circuitry. The COMP SYNC signal from the game PCB is coupled through a resistor and also sent on to the TV monitor.

3.4.5 SOUND PCB: On sheet 1 of the schematic the eight identical tank motor sound generator circuits are shown in zones A through D, 6 and 7. They are driven by a type-9334 device that decodes the BBAO through BBA2, 8BD0 and MOTOR signals coming from the game PCB. The tank motor, crash & explosion and bugle sound contributions are mixed at eight typc-LM324 amplifier stages to produce four output signals. These four signals serve as inputs to four type-LM380 amplifiers used as speaker drivers. Potentiometers R133 through R136 pro-provide the adjustments described in subparagraph 5.3 in Section V of this manual. During the attract mode, the ATTRACT signal, which comes from the game PCB, will disable the speaker drivers so that no sound can be produced.

On sheet 2 the BBAO through BBA2, BBDO and LOCK signals are decoded by a type-9334 device that drives eight darlington-connected transistor pairs. The eight collector outputs from these transistors connect in series to the lockout coils mounted in the coin mechanisms. There is one coil in each coin mechanism. When the lock-out coil is energized, the path for the coin is clear; when not energized, the path is blocked.

The two type-74164 serial-to-parallel shift registers form a noise generator circuit that is driven by the 2V timing signal generated in the sync countdown portion of the game PCB circuitry. The output of the noise circuit, at the collector of transistor Q20, is combined in an LM324 amplifier circuit with the EXPLOSION and CRASH signals coming from the game PCB. The CRASH signal is produced either when a tank runs into an object or when a tank gun fires. The EXPLOSION signal is produced when a shell explodes by itself or else hits an object, or when a tank runs over a mine. The signal resulting from the last amplifier of the combining circuit is named CRASH & EXPLOSION. Potentiometer R132 in this stage provides the adjustment described in subparagraph 5.3.

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