Casio fx-85GTX (ClassWiz)
The Casio fx-85GTX is a scientific calculator with 12 digits precision and formula input logic. It has 276 functions, 50 keys, and an LCD (liquid crystal) display. The power source is Solar. Note: Same as fx-83GTX but with solar power. A sample of this calculator is held in the calculator.org collection.
Facts at a glance:
Note that diagnostic tests generally delete any data on the calculator. Be sure to back up any important information held in the calculator before running these tests.
While holding down Shift and 7 keys, press ON (displays DIAGNOSTIC), release keys, then 6. Then choose from menu.
If you have a Casio fx-85GTX that is no longer working, it's probably easiest to just buy a new one, as this model is still currently available.