Timesharing programmable display system
US4119953A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1977 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Jan 24, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/153
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Electronic display system in which a single memory is timeshared by a plurality of display units each including a cathode ray tube (CRT) television monitor capable of displaying a frame of characters in the form of one or more lines as well as a central processing unit and a number of input/output units. Character codes representing the characters in each character line being displayed are stored in blocks of storage locations in the memory, one character line per memory block. A plurality of frame display programs, one for each display element, are stored in separate blocks of storage locations. Each program specifies the order in which the character lines are to be displayed by its corresponding display element. A refresh control unit common to all of the display units includes a basic line counting means which is employed to sequentially execute the frame display programs in retrieving the character codes from the memory and loading them into unit line buffers for the various display units. The basic line counting means is a part of an overall timing arrangement which controls the horizontal and vertical timing for each of the display elements such that the frame display cycles …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.