上海充通大学 SHANGHAI JIAO TONG UNIVERSITY 1.1 What is a computer bug? In 1947 Harvard University was operating a room-sized computer called the Mark Il. 。mechanical relays 数园2型 ·glowing vacuum tubes technicians program the computer by reconfiguring it Technicians had to change the occasional vacuum tube. A moth flew into the computer and was zapped by the high voltage when it landed on a relay. Hence,the first computer bug! Software EngineeringSoftware Engineering 1.1 What is a computer bug? In 1947 Harvard University was operating a room-sized computer called the Mark II. • mechanical relays • glowing vacuum tubes • technicians program the computer by reconfiguring it • Technicians had to change the occasional vacuum tube. A moth flew into the computer and was zapped by the high voltage when it landed on a relay. Hence, the first computer bug!