I'm borrowing my friends TI-86 because I lost mine a while back. I'm using it in my Statistics class right now. I need to use nmcdf and invnm but I can't find it on here. I think it might have been deleted. How do I get it back on here?
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I hadn't used mine in years and had the same problem. Essentially you just need to give it a workout to get all the pixels working properly again and then it'll be just fine. I adjusted the contrast between full dark and nothing multiple times and turned the calculator on and off after each cycle and now it works like new.