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:
Dec. 19, 1989
Filed:
Jan. 10, 1989
Edward F Getson, Jr, Peabody, MA (US);
John W Bradley, Peabody, MA (US);
Joseph P Gardner, Merrimack, NH (US);
Alfred F Votolato, Johnston, RI (US);
Bull HN Information Systems Inc., Billerica, MA (US);
Abstract
A controller controls data transfers between a data processing system bus and peripheral devices. In the controller, data buffers are divided into page frames. Paging circuitry provides for allocation and deallocation of pages to and from the data buffer. Included in the page circuitry is a paging RAM. The paging RAM and other paging circuitry components allow contiguously addressed pages of data to be stored in noncontiguous locations in the data buffer. There may be more than one data buffer and these data buffers may be exclusively seized by microprocessors in the controller via seizing logic.