Figure 23 Switch Test Display

COLOR PATTERN displays all 256 Food Fight colors on a 16 -by-16 grid of blocks in the center of the screen as shown in Figure 2-4. Use this display to check for color adjustment. Press the one-player start button to end this test. The colors are properly adjusted when the background is black and each colored block is distinguishable from those around it.

Food Fight has four blue levels, eight green levels, and eight red levels. These are overlayed to display the color grid as follows:

• Blue is displayed in four quadrants with level 0 (no blue) in the lower left quadrant, level 1 in the lower right quadrant, level 2 in the upper left quadrant, and level 3 (intense blue) in the upper right quadrant.

• Green is displayed in sixteen horizontal bars, two bars for each level, with level 0 (no green) bars at the center, level 7 (intense green) bars across the top and bottom, and intermediate levels in between.

• Red is displayed in sixteen vertical bars, with level 0 (no red) bars at the center, level 7 (intense red) bars at the right and left, and intermediate levels in between.

Figure 2-4 Color Pattern

CONVERGENCE PATTERN a white crosshatch pattern appears on the screen as shown in Figure 2-5. Use this pattern for convergence (see the raster-scan video display manual for a detailed procedure). Push the one-player start button to end this test.

Figure 2-5 Convergence Pattern

SOUND TEST tests the twelve channels of the three Custom Audio sound chips. As the channel number is displayed, the test sound is played. The test continues to cycle through the channels until the one-player start button is pressed to end the test. The channels correspond to the three Custom Audio chips as shown in Table 2-4.

Table 2-4 Sound Chip Locations

Chip No.

Board Location

Channels

1

11K/L

5,6, 11, 12

2

11L/M

1, 2, 7, 8

3

UN

?., 4, 9, 10

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