The TestGuard application itself has hard-coded MD5 hashes of every known OS and boot code combination. TI-Testguard 4.2 for the TI-84 Plus C Silver EditionĪfter staring at OS 4.0 and 4.2 differences all night, I've come to the conclusion that they didn't really change or add anything.at most, they may have fixed a TestGuard bug, but I haven't been able to find it.Īs far as TestGuard 4.x, they are in fact now validating the OS remotely. We look forward to a long future for the TI-84 Plus C Silver Edition as a tool for math and programming, and we hope to see more TI-OS 4.x versions in the future with a steady stream of new features and bugfixes. While we suspect the changes are intended to detect modified OSes, time will tell whether this is in fact the case. Based on information posted on TI-Planet and at Omnimaga, as well as digging from the inimitable Brandon Wilson, we believe that this new OS version works hand-in-hand with the new version of TestGuard linked below to further guarantee that TestGuarded calculators are running authentic TI-released operating systems. On the other side of the coin, it appears none of the bugs we have collected thus far has been fixed, so we did a bit of digging to determine what this new upgrade offers. TI-BASIC and z80 Assembly programming features remain unhindered. On the plus side, it appears at least as stable at OS 4.0, and in testing performed by Cemetech administrators, all existing programs, utilities, shells, and games continue to work. TI-OS 4.2 for the TI-84 Plus C Silver Edition has now been released, and can be downloaded at the link below. Unfortunately, as of T^3 2013, it was not clear what sort of success the TI-84 Plus C Silver Edition would become, so it was unsurprising that no OS upgrade was immediately forthcoming. We carefully tracked and tabulated a "Big Bad Bundle" of bugs, and we found TI very receptive to what we found. ![]() Unfortunately, as with any brand-new piece of software, the first OS for the TI-84 Plus C Silver Edition contained a number of mostly minor bugs. ![]() Thirteen months later, the calculator continues to be extremely popular, with programs and games for the color calculator stuck at the top of 's weekly list of most-downloaded programs. The calculator was officially released in 2013 Cemetech received one of the first devices manufactured courtesy of TI for a hands-on review. In November 2012, Cemetech discovered the first information about the TI-84 Plus C Silver Edition.
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