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what does this app actually do? I've never heard of it O.o
What JosJuice said, sorry. Actually we did not have OS 1.1 here, it was TI-BANK that did, along with every other OS, but TI asked them to remove 1.1 (not the rest). That said, there are free versions of the APP available at http://zoommath.com/Products/ZoomMath400.php , but I don't know if it does everything you need.I wonder if ticalc.org wouldn't have an equivalent of this app that does everything you need? They have plenty of math files there, although most are in TI-BASIC, so they might be a bit slower.Otherwise you can get rid of your 84+ app signature check protection, but then it would still be illegal to use paid apps on your calculator and since ZoomMath appears to use a serial code system the removal of the signature check wouldn't work anyway.