Game Operation

With this manual you received three large sheets that contain the wiring and schematic diagrams for the Tempest™/Cocktail game. Sheet 1, Side A, includes information that shows the arrangement of these diagrams. These diagrams explain the functions of the circuits and define inputs and outputs.

In addition, you received the Tempest Troubleshooting Guide, which includes information on signature analysis, CAT Box tests and the memory map.

Atari's Tempest/Cocktail is a microprocessor-controlled game. The microprocessor is contained on the game PCB. The game PCB receives switch inputs from the control panel and coin door. These inputs are processed by the game PCBs and output to the video display, Regulator/Audio II PCB, and control panel.

The color X-Y display receives signals for the X and Y axes and three color intensity signals (red, green and blue). Since the location of the beam in the display is controlled by the X- and Y-axis outputs of the game PCB, the game PCB does not contain a standard sync circuit. The X-and Y-axis inputs to the display step in increments of approximately 760



Figure 17 Power Distribution

steps for the X (horizontal) axis, and approximately 1000 steps for the Y (vertical) axis. The three intensity signals control the brightness of the three electron guns (red, green and blue).

The Regulator/Audio II PCB has three functions: 1) it regulates the voltages from the power supply to ± 5 VDC, 2) it rectifies and filters ± 22 VDC, and 3) it amplifies the audio output from the Auxiliary PCB.

Specifically, the +5 VDC from the Regulator/Audio II PCB provides most logic power to the Analog Vector-Generator and Auxiliary PCBs: ±22 VDC is regulated on the Analog Vector-Generator PCB to produce ± 15; and +22VDC provides power for the audio output of the Auxiliary PCB. The audio output from the Regulator/Audio II PCB directly drives the game speaker and is controlled by the volume control, mounted inside the coin door on the utility switch panel.

The power supply is the source of all voltages in the game. These voltages are protected by five fuses in the fuse block on the power supply chassis. The primary winding of the power supply transformer is protected by the cartridge-type fuse in the power supply chassis.

Figure 17 illustrates the distribution of power in this game. Figure 18 illustrates the distribution of signals.



Figure 18 Signal Distribution
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