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Semiannual technical summary rept. 1 Jun-30 Nov 1969
MASSACHUSETTS INST OF TECH LEXINGTON LINCOLN LAB
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Graphical output and interactive input routines have been written for the Basic Combined Programming Language BCPL, offering a useful alternative to assembly language for writing graphical subsystems on TX-2. Design work is under way on the system architecture and software for a new terminal support system intended to serve as many as 20 interactive but nondynamic graphic consoles. A storage scope editor has been implemented on TX-2 with the intent of exploring some of the problems to be encountered in the new system which will have storage scopes for display output. Experiments with the color display on TX-2 await the delivery of a new CRT with longer persistence. A box, or rectangle, generator was designed and installed in an attempt to reduce the display flicker for the semiconductor mask design application. The resulting improvement prompted detailed measurement of display system performance. A new character generator based on the stroke writing principle has been built and is being checked out. A program written to demonstrate the application of interactive graphics to regional planning has incidentally shown that the storage scope can provide quite adequate eight-level gray-scale area maps. Conclusions drawn from two years experience with programs that aid in the design of semiconductor masks have led to the design of a radically different, high performance, new system for integrated circuit layout and mask making. Progress has been made in the development and validation of a high-speed algorithm for testing the planarity of a graph which is expected to have application in the layout problem.
APPROVED FOR PUBLIC RELEASE