The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 30, 1985
Filed:
May. 22, 1981
Richard G Bratt, Wayland, MA (US);
Stephen I Schleimer, Chapel Hill, NC (US);
Edward S Gavrin, Lincoln, MA (US);
John F Pilat, Raleigh, NC (US);
Steven J Wallach, Saratoga, CA (US);
Lawrence H Katz, Oregon City, OR (US);
Douglas M Wells, Chapel Hill, NC (US);
Gerald F Clancy, Saratoga, CA (US);
Craig J Mundie, Cary, NC (US);
David H Bernstein, Ashland, MA (US);
Thomas M Jones, Chapel Hill, NC (US);
Brett L Bachman, Boston, MA (US);
Data General Corporation, Westboro, MA (US);
Abstract
A digital computer system in which data storage is referred to by a descriptor comprising an object number denoting a variable-length block of storage, an offset indicating how far into that block a desired data item begins, and a length field denoting the length of the desired data item. Separate means exist for manipulating each of the three descriptor portions, thus facilitating repetitive operations on related or contiguous operands. Various levels of microcode control are included. Each level of microcode control has its own stack, facilitating interrupts between levels. Stacks are duplicated in 'secure stacks' in memory to protect against loss of state data from the stacks.