From the AX|BX page at Assembler.org:

"When arcade machines boot, many will preform a self test, part of which is visual in nature. These come in various shapes and sizes. Some are for video calibration (convergence grids, color patterns, etc), while others show a tile map of sprites used in the game. These test screens can last a millisecond, or flash through a sequence of visual items that last several seconds.

For extra credit, watch while playing one of these:

http://2a03.assembler.org/Rahm_Fk.mp3
http://2a03.assembler.org/7_Hy.mp3
http://2a03.assembler.org/+28.mp3

Be sure load sound first. (Thanks, Josh!)

AX | BX [Assembler]

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