Communications: electrical – Systems – Portable self-contained
Patent
1977-01-24
1978-10-10
Curtis, Marshall M.
Communications: electrical
Systems
Portable self-contained
340152R, G06F 314
Patent
active
041199537
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 of the various elements are offset from one another by a sufficient amount of time to allow the aforementioned execution of the frame display programs.
REFERENCES:
patent: 3500327 (1970-03-01), Belcher et al.
patent: 3505665 (1970-04-01), Lasoff et al.
patent: 3623069 (1971-11-01), Malden
patent: 3641558 (1972-02-01), Cook et al.
patent: 3641559 (1972-02-01), Hogan et al.
Curtis Marshall M.
Hubbard Robert R.
Mohawk Data Sciences Corp.
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