[Aguilera Dario] likes his Casio fx-82ES calculator. However, it was missing a few functions, including complex numbers. A Casio fx-991ES has more functions but, of course, costs more. A quick Google revealed that if you press the right buttons, though, you can transform an fx-82ES into an fx-991ES.
Because it is apparently a buffer overflow exploit, the hack involves a lot of keys and once you cycle the power you have to do it again. [Aguilera] realized this would be a good candidate for automation and added a microcontroller to push his buttons. You can see a video of a breadboard version below. He also has a PCB version in the works that should be better integrated.
The automation hardware patches into the button matrix through test pads on the back of the calculator’s PCB. [Aguilera] soldered ribbon cable directly to these pads, then snaked it out through a slot cut into the back of the calculator case where it is terminated with a 0.1″ pin socket. An Arduino Mini is used in the prototype, the next revision will use an ATmega328P on a custom board. The uC interfaces with the button connections using the venerable 4066 chip which is able to act as an analog switch.
The board layout for the PCB version is shown on the project page. There is no word on whether this is meant to be a permanent addition to the calculator, or just plugged in for the exploit and stored away for use the next time power is cycled. Either way, it’s neat to learn about this exploit and a cool challenge to automate it!