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It's called a teletext box. Back in the 80s, when closed captioning was new, the idea developed that we would be able to access information through our TVs via a modified form of closed captioning. It looked and acted like the old message boards on cable access stations. The idea died soon after it was birthed due to PCs and bulletin boards and something called the Internet.

One remnant of teletext is the box that was the background for the text. It still pops up from time to time when certain captioning modes are selected on the TV. You should never use the "text" modes-they are for teletext only and will trigger the black box.
 
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