Genrad, Inc.

James K Skilling

Brian J Sargent

This apparatus controls the execution and content of computer programs in equipment containing a computer by causing the transfer of program data elements, including computer instructions, with a memory means of the apparatus, wherein the selection of data for transfer is effected either by the computer, operating in a normal manner, or by the apparatus, which may shift data selection between these two selection options so that the computer ceases selection of data constituting one program and begins selecting data of another program. While data elements are being transferred with the computer, other elements of the memory means are available for examination and modification such that new programs, the content of which may depend on the results of prior program execution, can be loaded, executed, and examined without interrupting, delaying, halting, or otherwise disturbing the instruction flow of the computer equipment.

Method of and apparatus for external control of computer program flow

This apparatus controls the execution and content of computer programs in equipment containing a computer by causing the transfer of program data elements, including computer instructions, with a memory of the apparatus. The selection of data for transfer is effected either by the computer, operating in a normal manner, or by the apparatus, which may shift data selection between these two selection options so that the computer ceases selection of data constituting one program and begins selecting data of another program. While data elements are being transferred with the computer, other elements of the memory are available for examination and modification such that new programs, the content of which may depend on the results of prior program execution, can be loaded, executed, and examined without interrupting, delaying, halting, or otherwise disturbing the instruction flow of the computer equipment.

Control apparatus for back-driving computer memory and forcing execution

This disclosure is concerned with a process for connecting a short detector to electrical nodes in such apparatus as backplanes, cables, and circuit boards, before and after component assembly, to identify shorted node pairs in a substantially smaller number of tests than required by previously known methods, through a novel series of tests between each node and all other nodes, taken together, so as to identify shorted nodes, and then a series of tests between each of these shorted nodes and all other shorted nodes, taken individually, to identify the shorted node pairs.

Method of electrical short testing and the like

A method and apparatus are disclosed for identifying and locating faults in the portion of circuit assemblies containing digital signals by conducting in-circuit tests embodying the application of uninterrupted sequences of signals to nodes of the circuits and the comparison of nodal signals to expected values, reducing the complex testing of the circuit assemblies to a series of simple tests of components or groups of components constituting the assemblies; and, in connection with bus-structured circuits, eliminating the possibility of bus contention problems in good circuit assemblies under test.

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Harvard, MA, United States of America

James K Skilling