There are several short ways to write programs to reset or lock up your TI-83... Assembly program example: xxx END 0000 END Where xxx can be: C30000 - Reset (Mem Cleared) CD0000 - Reset (Mem Cleared) C7- Reset (Mem Cleared) F376 - Lock up C32793 - Infinite loop F3C32793 - Infinite loop (lock) CD2793 - infinite loop and stack overload PS. Start assembly-programs using send(9prgmPROGNAME ~Grauw