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:
Sep. 17, 2002
Filed:
Jan. 28, 1999
Applicant:
Inventors:
David L. Helsley, Glastonbury, CT (US);
Michael R. Chase, Farmington, CT (US);
Assignee:
Computer Associates Think, Inc., Islandia, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G06F 9/44 ;
U.S. Cl.
CPC ...
G06F 9/44 ;
Abstract
A method and system of emulating an input/output (I/O) device in a mainframe environment. A started task executing as part of the operating system gains control of I/O instructions directed to virtual devices by insuring that such I/O instructions cause interrupts. The started task then hooks the branch point for such interrupts. Upon obtaining control, the started task causes the I/O source to believe a transaction with a predefined data space in a general storage area on board the mainframe is actually a transaction with a physical device.