TOGELMACAU: Knoxville, USA: University of Tennessee Press

TOGELMACAU Bobs required more processing power than sprites, because they required at least one DMA memory copy operation to draw them on the screen. Sometimes three distinct memory copy operations were 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 moved away. While VSprites were a virtualization of hardware sprites Bobs were drawn into a playfield by the blitter, saving and restoring the background of the GEL as required. In contrast to hardware sprites Bobs were not limited in size and number.|The Amazing Race 19