FX-92 LCD - Dec 2019

This was obviously not intended to be used for cheating on exams...

DESCRIPTION

Quick reverse engineering work on the Casio FX-92 calculator. I intended to repurpose the LCD to be able to use it with another microcontroller. I do not remember being able to display anything except garbage on this, might have to try it again some day.

GALLERY

I do not remember why I needed level shifters

IIRC top row of brown PCB was source signal and bottom was LCD lines

Not sure what I was measuring but el-cheapo oscilloscope in action

A closer view of the MITM PCB

Garbage displayed from a PIC µC