One product I absolutely loved from Casio was their Japanese electronic dictionaries. At some point they replaced their black and wide LCD screens with backlit

One product I absolutely loved from Casio was their Japanese electronic dictionaries. At some point they replaced their black and wide LCD screens with backlit full-color LCD screens and the hardware became much slower. I've been looking for resources on reverse engineering or jailbreaking the late 2000's models, but haven't been able to find much.