I am wondering how electronics work. Specifically portable, digital electronics with graphical user interfaces like cell phones, iPods, PSP’s and other devices.
How is the interface created for the device?
When you press a button or key, how does it know what to do? For example, when you press a button on a cell phone, how does it know what letter or number to show on the screen, especially when the functions of buttons change for different applications?
Please be very detailed.
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