Abstract: Apparatus and method for testing video controller devices used with a monitor terminal to generate display configurations on the terminal monitor. The disclosed apparatus and method is embodied in test apparatus arranged to prerecord a count of pixel transitions in a test pattern display intended for use in testing video controller devices. Data representing the test pattern display is applied to video controller devices to generate control signals normally enabling the video controller devices to control a terminal monitor to display the test pattern. A count of the pixel transitions generated by a tested video controller device in response to the applied data is compared with the prerecorded count of pixel transitions to determine performance of the video controller device.