Name the appliances which are controlled by micro-processor
Many household appliances which are microprocessor-controlled do not have operating systems (for example microwave oven, fridge, etc.). Microprocessor has just one set of tasks to perform; basically straightforward inputs are expected (for example a keypad on the front of a microwave oven) and they have simple never-changing hardware to control. Hence, it isn't essential to have an OS; so resulting in reduced development and manufacturing costs for household devices.