Accession Number:

AD0707352

Title:

COMPUTER REPRESENTATION, GENERATION, AND MANIPULATION OF GRAPHICAL INFORMATION,

Descriptive Note:

Corporate Author:

CALIFORNIA UNIV BERKELEY

Personal Author(s):

Report Date:

1967-03-22

Pagination or Media Count:

81.0

Abstract:

The thesis describes a computer, called a picture generator, especially designed for processing graphic information. The machine language is a form of compiled LISP with data and program therefore represented as LISP tree-structures. The topology and picture information occur in the same structure, and intermediate forms usually found in graphic systems are not necessary. Recursion and nesting required for LISP are implemented with instructions whose operands are push-down stack pointers. The picture generator is designed with microprogrammed control and interfaces to a primary memory which is shared with other processors. Included in the processor are analog circuits for generating lines and symbols on cathode ray tube displays, and graphic input devices such as RAND Tablets or lightpens provide input. With a 100 nanosecond read-only memory ROM for the microprogram, a 12-bit multiply or divide is performed in 4 microseconds and symbols are generated from data stored in the ROM in 7 microseconds. Author

Subject Categories:

  • Computer Programming and Software
  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE