when a particular video chip is a video display controller and when it is a video display processor. For example, the TMS9918 may be referred to either way, depending on the source.

Generally, a canonical VDC would not include any internal capability to perform graphics operations on its own, the ability to draw lines or fill areas for instance, and relies on the host CPU to perform these sorts of operations by performing those calculations and depositing the results in memory for the VDC to read. Blitters add some of these features,