The program for the music app stored in the memory will tell the processor to turn the input into sound output through headphones or a speaker.

A program inputs its data from the standard input device by calling Java’s System.in.read() method. Look in the SDK documentation and you’ll discover a class called System.

For anyone who’s seen a 1970’s era microcomputer like the Altair 8800 doing its thing, you’ll know the centerpiece of these behemoths is the array of LEDs and toggle switches used as input ...

Input and output programming currents are driven by a 0.5-mA source. Since this op amp is a dual device, one half is connected as a comparator and the other half remains as a spare.