Abstract: A pocket size data terminal is described for use by a large number of consumers in a system with which goods or services can be conveniently and automatically ordered. A plurality of data terminals which can automatically dial a local processing center (LPC) are distributed among users each of whom can address the LPC with a unique user identification and an internal terminal identification. The terminal is internally battery powered. Each data terminal can accumulate orders for goods or services in a send memory while the terminal is unencumbered by any external connector. When subsequently connected to a phone line modular jack, upon command by a user send memory contents are automatically sent to an LPC in a short burst. The LPC verifies the use of the terminal, the authorization of the requested service and format of the data as well as other items as may be included in the order.

Abstract: A method and system are described for communicating data from a central station to a plurality of subscribers using conventional television signal format. Individual television scan lines in a television frame are preassigned to convey data to particular subscribers. The preassignment of a television scan line may be, with respect to a portion of a line, one entire line or a multiple of scan lines, depending upon the data requirements of the respective subscribers. For address identification by these subscribers these television scan lines occupy predetermined positions in the television frame. A two-way communication system is provided whereby the subscribers may each return to the central station data transmissions on a different channel or carrier frequency using single or multiple television scan lines.