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:
Mar. 15, 1988
Filed:
Feb. 14, 1983
Edwin P Fisher, N. Abington, MA (US);
Ralph G Schuberth, Bedford, MA (US);
Honeywell Information Systems Inc., Waltham, MA (US);
Abstract
A memory board can be assembled with one, two or more rows of memory chips to provide a corresponding number of different memory capacities for expanding the capacity of main memory which resides on a basic logic board containing the processing units and other units of a system. The memory board includes a programmable read only memory (PROM) circuit which receives as inputs from the basic logic board a predetermined address portion of each memory address together with memory refresh and timing signals. The PROM circuit is coded in a predetermined manner for generating at its output terminals row address select (RAS) pulse output signals to a row or block of memory chips designated by the predetermined address portion. The pulse widths of the output signals are established by the timing signal applied to an enabling terminal of the PROM.