Abstract: A repeater circuit for repeating data on a communication channel, the repeater circuit having two receiver/driver circuits arranged in repeating fashion and having a control circuit for maintaining the receiver/driver circuits in a listening mode, for switching one of the receiver/driver circuits to a transmitting mode when the other of the receiver/driver circuits receives data, and for maintaining the switched receiver/driver circuits switched by an amount of time required for the bus connected to the switched receiver/driver circuit to return to its normal state after the cessation of transmitted data.

Abstract: An alarm message generation and broadcast system having supervision including an alarm message generation circuit for generating an alarm message, an output for receiving the alarm message so that the alarm message can be broadcast in response to an alarm event; and a supervision circuit connected to the alarm message generation circuit and responsive to the alarm message for providing a trouble signal when the alarm message is not properly received by the supervision circuit.

Abstract: There is disclosed a computer system including a storage means such as a random access memory (RAM) for receiving data to be displayed upon a display means, e.g. a color cathode ray tube, a microprocessor for control of the computer system operations, and viewer input devices such as a control stick or keyboard, whereby the viewer may respond selectively to the data displayed upon the display means. A limited capacity storage unit, illustratively in the form of a tape cassette, stores data in the form of a program for permitting the viewer to store useful material in the form of a repository, such as a Christmas list; the program to be displayed by the display means can assume any of a limitless number of programs and may be adapted to an exceptionally wide range of uses for the home, office or school. The computer system permits the viewer to respond as through the input devices, to the material being displayed, whereby subsequent material may be effected.

Abstract: A system is described for selecting and replaying desired tape segments of a recorded tape, a video tape for example, in any predetermined sequence. The system accepts an operator's designation of which segments of the tape are desired for replay and in which sequence those segments are to be replayed, irrespective of the location of the selected segments on the tape. An electronic controller, responsive to the operator's designations, causes the playback machine to replay each selected tape segment in the proper sequence.

Abstract: There is disclosed a computer system including a storage means such as a random access memory (RAM) for receiving data to be displayed upon a display means, e.g. a color cathode ray tube, a microprocessor for control of the computer system operations, and viewer input devices such as a control stick or keyboard, whereby the viewer may respond selectively to the data displayed upon the display means. A limited capacity storage unit, illustratively in the form of a tape cassette, stores data in the form of a program for permitting the viewer to store useful material in the form of a repository, such as a Christmas list; the program to be displayed by the display means can assume any of a limitless number of programs and may be adapted to an exceptionally wide range of uses for the home, office or school. The computer system permits the viewer to respond as through the input devices, to the material being displayed, whereby subsequent material may be effected.