An input can be information or even power to a system. A switch or number. It will take this and after either computation, comparison or consumption do work of some kind. That is output. It can take many forms.
( ignoring friction losses )input force * mechanical advantage ( speed in/speed out )= output force,but work done at both ends is the same (force * distance in direction of force) .
Programmed input/output (PIO) is a method of transferring data between the CPU and a peripheral such as a network adapter or an ATA storage device.In general, programmed I/O happens when software...