Which circuit card is responsible for controlling the blanking and unblinking of the CRT?

The CRT control card is specifically designed to manage the functions related to the cathode-ray tube (CRT), including the blanking and unblinking processes. Blanking refers to the momentary interruption of the electron beam in the CRT, effectively turning off the display to avoid displaying unwanted information during certain operations, while unblinking is when the display is activated again.

This direct control is crucial for ensuring that the image displayed on the CRT is clear and does not show artifacts during the times when no relevant data is available. In contrast, other card types like the video processing card focus on handling video signals and image processing, the power supply card is responsible for providing the necessary electrical power to various components, and the signal processing card typically deals with the manipulation and interpretation of incoming signals rather than the specific operational control of the CRT display. Thus, the CRT control card is uniquely suited for managing the blanking and unblinking functions critical to the operation of the CRT.