Accession Number:

AD0712805

Title:

DISPLAY OF INFORMATION FROM THE IMMEDIATE-ACCESS STORAGE OF A DIGITAL COMPUTER ON THE SCREEN OF A CATHODE-RAY TUBE,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1970-06-12

Pagination or Media Count:

11.0

Abstract:

A method for generating computer-programmed readout displays is discussed. The technique uses the storage facilities of the BESM-6 and a standard TV picture tube having a 400 x 400 point raster. It is designed for graphical and alphanumeric displays, up to a maximum of 1200 symbols, including Latin and Cyrillic characters, numbers, and signs. External programs for alphanumerics, for example, are stored on four tracks of a BESM-6 drum. A symbol is generated in a sub-raster of 8 x 8 bits, in two drum revolutions since drum speed is 2850 rpm, full raster rate is 24sec. A figure shows an example of writing the given Cyrillic. Codes are parallel-stored in a shift register, and then read out sequentially and applied to the display tube electrodes as shown in a figure. Since the drum tracks are in four quadrants, there is an information gap in readout this is compensated for by forming the main raster in eight 50-line subframes, and backing up the delayed portions by one line, thus eliminating image gap and minimizing flicker. Horizontal lines are one line width apart, and symbols are spaced 13 of a symbol width apart. The proposed display method is recommended for its simplicity and flexibility. Author

Subject Categories:

  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE