9. A method of selectively storing, in a plurality of successive storage locations contained in a data storage device, a plurality of groups of successive data words which are present on logic circuitry of a system under test, each said group comprising at least one particular data word and no more than a predetermined number of data words which precede said particular data word on said logic circuitry, each said storage location having a storage address, said method comprising the steps of: (a) providing predetermined most significant bits to form a first portion of each said address; (b) providing a predetermined number of least significant bits to form a second portion of each said address; (c) changing the value of said second portion in response to the presence of said data words on said data bus; (d) storing successive data words at storage locations having addresses determined according to (a), (b), and (c); and (e) changing the value of said first portion in response to the presence of said particular data word on said data bus.
9. A method of selectively storing, in a plurality of successive storage locations contained in a data storage device, a plurality of groups of successive data words which are present on logic circuitry of a system under test, each said group comprising at least one particular data word and no more than a predetermined number of data words which precede said particular data word on said logic circuitry, each said storage location having a storage address, said method comprising the steps of: (a) providing predetermined most significant bits to form a first portion of each said address; (b) providing a predetermined number of least significant bits to form a second portion of each said address; (c) changing the value of said second portion in response to the presence of said data words on said data bus; (d) storing successive data words at storage locations having addresses determined according to (a), (b), and (c); and (e) changing the value of said first portion in response to the presence of said particular data word on said data bus. 12. The method of claim 9 further including the steps of: (f) providing location data indicative of the order of occurrence of said stored 10 data signals on logic circuitry; and (g) storing said location data with said stored data words.