In the early 90's, TV's started including low-resolution "Teletype" type chips (the kind you see overlay information on security cameras) that would generate me

In the early 90's, TV's started including low-resolution "Teletype" type chips (the kind you see overlay information on security cameras) that would generate menu text for volume control, etc. Frequently these TV's would have a "muting" mechanism - if you selected a channel without a signal, it would mute the audio and display a blue background instead of the underlying signal. When LCD TV's and HDTV started gaining traction the "No Signal" screen was often some text bouncing around in some manner.