I pad computer system
The I pads input is the same as its output the input and output is the screen.
I pads output
An I pads output is the same as its input it is the screen.
I pads proccessing unit
The I pads processing unit is it's CPU unit
iPad User Guide - The Basics
iPad Air 2 VS Air VS 4 VS 3 VS 2 VS 1 VS Mini 3 VS Mini 2 VS Mini Speed Comparison