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:
Jun. 07, 1983
Filed:
Feb. 16, 1979
Richard L King, Hollis, NH (US);
John J Bradley, Framingham, MA (US);
Ming T Miu, Chelmsford, MA (US);
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
In a data processing system which includes a central processing unit and one or more main memory units comprised of semiconductor dynamic random access memory chips, logic is provided within the system to provide for the single stepping of the central processing unit clock thereby allowing for the execution of one CPU cycle. The system logic is organized such that the memory refresh command signals, which are normally generated by the CPU, are generated by the single step logic thereby maintaining the contents of the main memory modules. The logic of the overall data processing system is organized such that most transfers of information between the main memory, the CPU and I/O controllers, to which peripheral devices are connected, may take place in the single step mode of operation without the loss of information.