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Re: Printing over other text
The data on the driver station is only updated when you call dsLCD->UpdateLCD(). Clear() doesn't make that call, so by calling Clear() you're only clearing out the robot-side buffer, but not updating the screen with it.
I personally don't mind having the stale data on the DS, especially since it leaves a snapshot of the robot's state from right before the connection was lost. Whenever I'm using the DriverStationLCD class though (which isn't as common now that SmartDashboard is available) I put in a call to Clear() before any Printf()s, just so that I can be sure I'm not forgetting to blank out any lines. It's all up to you though
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