Casio fxcg 500, FX CP 400

[richmit]

I don't think the Classpad II has a "polar display mode". You can enter numbers in polar or rectangular format. If your computation only has real & rectangular format complex numbers, then the results are rectangular format. OTOH, if your computation contains a polar format complex number, the result is a polar format complex number. In practice this works pretty well. You can force the Classpad II to convert a number to rectangular or polar form with the compToPol or compToRect commands.

As for negative reals, they get displayed as <(-1,180) in degrees mode.