I'm not buying it. The patent involved is substantial; the blinking cursor is not. They could have implemented a blinking cursor without XOR. However, if the

I'm not buying it. The patent involved is substantial; the blinking cursor is not. They could have implemented a blinking cursor without XOR. However, if their entire graphics strategy was essentially a duplicate of this patent, then that would be a problem. I really, really don't like software patents, but solving this problem (flicker in animation) in 1978 may be one of the cases that would be worth it. Link to patent courtesy of pvg http://news.ycombinator.com/item?id=1545347 http://news.ycombinator.com/item?id=1545347