Data entered at the keyboard of the teletype could be directedto a perforator or punch which punched a pattern of holesacross the width of a paper tape to represent the characterstyped. The paper tape could be read by a tape reader feedingthe computer. Computer output could be similarly punched ontotape and printed off-line. As well as storage of the program and data, use of paper tapeenabled batch processing. The first units had five data hole positions plus a sprocket hole(for the driving wheel) across the width of the tape. These usedcommercial telegraph code (ITA2 also known as Murray), Baudotcode or proprietary codes such as Elliott which were moreprogrammer-friendly. Later systems had eight data holes and used