Teletext and Non Teletext Highlighting
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Here's a simple method I devised in November 2022 to use a text highlighting system which works in Teletext and other screen modes without upsetting the formatting. Adding Teletext highlighting involves inserting one or more control codes into the text to change foreground or backgroun colour, and it looks a mess if the same codes are displayed in a graphics mode. Similarly, using highlighting in graphics modes by changing the foreground or background colour can upset the formatting in mode 7 as the colours don't work. Please click on the picture links above to learn more.