Circuit arrangement for character display on a television display screen

Claim 1

A circuit arrangement for the display of digital information in the form of characters on a television display screen, comprising a buffer store for receiving in coded character information and for storing sufficient information to simultaneously display characters on the entire screen of a television display, the buffer store further comprising a plurality of N identical circulating stores each capable of storing the information of one line of the television display where N is the maximum number of lines of the television display, a further circulating store connected to the buffer store for storing one line of television display information, a control device connected to the circulating store and to the buffer store for providing signals circulating the information in the buffer store once each scan of the television display and providing signals for reading selected information from the buffer into the further circulating store and for providing signals to the further circulating store for interrogating preselected portions of the information in the further circulating store, a character generator connected to the further circulating store for converting the information from the further circulating store into signals compatible with the television display, the control device comprising a character counter for counting the number of character on a line of television display and a line counter, a selection device in the buffer store responsive to signals from the counters for transferring character information from the buffer store to the further circulating store at a time corresponding to the interval between lines on the television display.