Casio Cassiopeia

Casio was one of the first manufacturers of PDAs, developing at the beginning small pocket-sized computers with keyboards and grayscale displays and subsequently moving to smaller units in response to customer demand.

It was quickly discovered that most consumers wanted smaller devices, so the Palm-size PCs were developed.

[4] The Cassiopeia E-15 was the last model of Palm-size PC introduced by Casio that used a grayscale display.

Casio decided it would not issue an update for the E-100 and E-105, and a lot of owners of the devices complained.

After using the MIPS processor in the E-15 and the E-1xx series devices, the E-200 switched over to the StrongARM CPU, in keeping with Microsoft's specifications.