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Raster scan computer graphics displays with "real time" character generators have previously been limited to alphanumeric characters. A display is described which extends the capabilities of this organization to include general graphics. The feasibility of such a display is shown by deriving the minimum number of patterns required in the read only memory of the character generator to synthesize an arbitrary line. The synthesis process does not compromise picture quality, since the resulting dot patterns are identical with those of a conventional raster display. Furthermore, the time constraints of a raster display are shown to be satisfied for a typical design for very complex line drawings. [ABSTRACT FROM AUTHOR]

A television-like scanned-display system has been successfully Implemented on a Honeywell DDP424 computer installation. The scanned image is stored in the core memory of the computer, and software scan conversion is used to convert the rectangular coordinates of a point to the appropriate word and bit In an output display array in core storage. Results thus far Indicate that flicker-free displays of large amounts of data are possible with reasonably fast graphical interaction. A scanned Image of size 240 X 254 points is displayed at a 30 frame-per-second rate. [ABSTRACT FROM AUTHOR]

The article presents a calendar of events related to computing machinery in the U.S. from September to November 1971. The Third Symposium on Operating Systems Principles, sponsored by the Association for Computing Machinery's Special Interest Group on Operating Systems, will be held at Stanford University from October 18 to 20. The Fourth Annual Workshop on Microprogramming will be held at Crown College, University of California on September 13 and 14. A conference on two-dimensional digital processing will be held at the University of Missouri-Columbia from October 8 to 10.