As the title says, I want to know uf messing with the screen can damage it.
By messing with it, I mean changing values in port 4000(?).
So that you for example get this:


Or that the screen doesn't do anything.(but that the calculator still works)
I would advise against randomly writing data to random LCD registers.

But you can mess with it all you like so long as you stick to the datasheet: https://wikiti.brandonw.net/index.php?title=84PCE:Ports:4000
  
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