Abstract A display system primarily for utilization as a remote terminal device in a computer system, incorporating a single recirculating store. The store incorporates a recirculating register that stores the entire message to be displayed on a cathode ray tube; the register operates at a predetermined first frequency and a character generator is utilized to continuously read the encoded characters recirculating in the store and develop video signals therefrom. The beam of the cathode ray tube, under the control of a timing generator, sweeps the first scan line of each row of characters to be displayed, then sweeps the second scan line of each row and so on until all of the scan lines of each row of characters has been scanned and the message has been displayed. No scanning takes place between the character rows. During the sweep of the beam along a scan line, the recirculating register operates at the predetermined first frequency; however, upon the completion of each scan line and until the sweep of the next scan line, the recirculating register operates at a second predetermined but lower frequency.
Inventors
👤 L Hittel
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-10-23 05:21
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/22; G09G5/222
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
228 words
In a CRT display system for displaying information, said information comprising one or more rows of characters formed by generating dots on the CRT while sweeping a plurality of scan lines for each row of characters with the beam of said CRT, said system connected to a transmission line for receipt of bit serial information, the improvement comprising: a. an input register for receiving bit serial information and transferring said information in character serial form; b. a memory connected to said input register to receive said character serial information, said memory comprising a recirculating register having a first and a second recirculation rate; c. a character generator connected to said memory to serially detect characters recirculating in said memory and to successively generate codes in response to each character; d. a CRT control means connected to said character generator for generating dots on said CRT in accordance with said codes during the sweep of said beam along a scan line; e. said memory, when operating at said first recirculation rate, serially presenting all characters in a row of characters to the character generator during the time said beam sweeps a single scan line of said row of characters; f. said memory, when operating at said second recirculation rate, presenting no characters to the character generator during the time said beam retraces to the start of another scan line.
Claim 2
Dependent Claim
228 words
In a CRT display system for displaying information, said information comprising one or more rows of characters formed by generating dots on the CRT while sweeping a plurality of scan lines for each row of characters with the beam of said CRT, said system connected to a transmission line for receipt of bit serial information, the improvement comprising: a. an input register for receiving bit serial information and transferring said information in character serial form; b. a memory connected to said input register to receive said character serial information, said memory comprising a recirculating register having a first and a second recirculation rate; c. a character generator connected to said memory to serially detect characters recirculating in said memory and to successively generate codes in response to each character; d. a CRT control means connected to said character generator for generating dots on said CRT in accordance with said codes during the sweep of said beam along a scan line; e. said memory, when operating at said first recirculation rate, serially presenting all characters in a row of characters to the character generator during the time said beam sweeps a single scan line of said row of characters; f. said memory, when operating at said second recirculation rate, presenting no characters to the character generator during the time said beam retraces to the start of another scan line.
Claim 3
Dependent Claim
52 words
The combination set forth in claim 1, wherein said CRT control means includes a timing generator for directing said beam to sweep the first scan line of all rows of characters, then the second scan line of all rows of characters, and then the succeeding scan lines of all rows of characters.