Reminds of the Casio calculator. I don't remember the specifics, but a cheaper model is actually exactly the same as the more expensive one. They cut off a conn

Reminds of the Casio calculator. I don't remember the specifics, but a cheaper model is actually exactly the same as the more expensive one. They cut off a connection of the circuit board to disable the advanced functions. All you have to do is to connect the cut wires with a pencil stroke, and the calculator is "upgraded".