An historical perspective on user Interface Early “personal” computing was often characterized by computers that had toggle switches and lights. To load a program into a computer, a user set a number of togg

An historical perspective on user Interface Early “personal” computing was often characterized by computers that had toggle switches and lights. To load a program into a computer, a user set a number of toggle switches in a proper pattern, then pressed a button to load one character, byte, or word into the computer’s memory, needless to say, this method was very slow and extremely error-prone. Output from the computer was often displayed in binary on a panel of light. A major improvement came about with the introduction of punched paper tape, punched cards, and line printers