Three data-communication systems

Describes 3 completely different types of systems intended for different applications. Two of the types consist of a number of compatible data-communication terminals that make it possible to transmit between different types of data media, such as paper tape, punched cards, magnetic tape, and printers. These types of systems can also be easily arranged to operate with on-line computers. The third system is specially designed to operate with the Teletype T33 teleprinter equipment, and can also be connected to other equipment, for example a computer. All 3 systems are intended for use over 2-wire or 4-wire circuits in the telephone network.