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A blitter object ( Bob) is a graphical element (GEL) used by the Amiga computer. Bobs are hardware sprite-like objects, movable on the screen with the help of the blitter coprocessor.
In contrast to hardware sprites Bobs are not limited in size and number. Bobs require more Clock rate than sprites, because they require at least one DMA memory copy operation to draw them on the screen. Sometimes three distinct memory copy operations are needed: one to save the screen area where the Bob would be drawn, one to actually draw the Bob, and one later to restore the screen background when the Bob moves away.
An AnimComp adds animation to a Bob and an AnimOb groups AnimComps together and assigns them velocity and acceleration.
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