Time of event recorder

Claim 1

An event recorder comprising in combination: a. a source of regularly occurring timing pullses of a period, T. b. counting means having a plurality of bistable stages coupled to said source to receive said timing pulses, said counting means including a pluarlity of bistable stages interconnected such that only one at a time of said plurality of stages is toggled from a first state to a second state upon receipt of individual ones of said timing pulses; c. a first word organized memory array having M word lines intersecting with N digit/sense lines and an information storage element located at each such M × N intersection; d. a second word organized memory array having M word lines intersecting with P digit/sense lines and an information storage element located at each such M × P intersections; e. means connecting said M word lines in said first and second memory arrays in series; f. digit current driver means coupling said N digit/sense lines of said first memory array individually to said plurality of bistable stages of said counting means for applying a current of a first polarity to those of said N digit/sense lines associated with said bistable stages which are in a first state and a current of a second polarity to those of said N digit/sense lines associated with said bistable stages which are in a second state; g. means including further digit current driver means and delay means for coupling said timing pulses successively to said P digit/sense lines of said second memory array; and h. means responsive to the occurrence of an event for applying a current pulse to one of said M word lines to thereby store in the memory elements of said first and second arrays located at the intersection of said one of said M word lines and said N and said P digit/sense lines the instantaneous value contained in said counter means and a value indicative of the elapsed time following the application of the last regularly occurring timing pulse from said source to said counting means.