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If you are an engineering student: Keep your physical F-789SGA II in your bag. It is more reliable than any emulator. If you are an educator: Lobby Canon for an official release. The demand is clearly there.
However, owning the physical unit is not always convenient. Perhaps you left it in your locker, you are teaching a virtual class, or you want to practice complex equations on a large screen. Enter the need for a .
Until then, treat any "free download" with extreme skepticism. Your computer's security is worth more than the convenience of a virtual keypad. Disclaimer: This article is for educational purposes. The author does not distribute copyrighted firmware or endorse the use of emulators for cheating on examinations.