Recently a proof of concept virus for the TI-89 calculator has been discovered. The virus is a parasitic infector and it uses an entry point obscuring technique to mask its presence in an infected file. The virus is executed whenever an infected file is run and upon gaining control, it hooks a particular function that allows it to be triggered later on when that specific function is called. The virus is known to clear the screen and display a the string “t89.GAARA”. In general, this TI-89 calculator virus behaves in the same way as the old DOS viruses of the past, which is not surprising because the TI-89’s “operating system” is built pretty much the same way as DOS was: granting full functionality to programs but very minimal security.