Well not very commonly in computers, BC runs off the CPu
LOL that's only for processing info not the graphical side of the system/game... GPU's have been around a long time before BC.....
Never heard of ATI's old "Rage Pro" for example or later Nvidia's "GeForce 2" that was released in 2000?
I've used many in the past years.
Only way I see ya not knowing about them is the use of on board GFX chips on the motherboard. (common still today for prebuilt systems by HP and others)
but I feel this is getting way off topic lol the question has already been answered here.