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A lot of the computer systems in use today are embedded in other 1_______, such as automobiles (a car has as many as 30 or more microcontrollers), telephones, washing machines, microwave ovens, appliances, and peripherals for computer systems. They are called embedded systems. While some embedded 2_______ are very sophisticated, many of them have minimal requirements for memory and program length, with no operating system, and low software complexity. Typical input and output 3_______ include switches, relays, solenoids, LEDs, small or custom LCD displays, radio frequency devices, and sensors for data such as temperature, humidity, light level, etc. Embedded systems usually have no keyboards, screens, disks, printers, or other recognizable devices of any 4_______ computer.