Abstract: Assays for analyzing a sample comprising nucleic acid are described, in which the sample is contacted with an array comprising a set of oligonucleotides attached to a solid support at identifiable locations, wherein each oligonucleotide in the set comprises a label at the distal end of the oligonucleotide; incubating the contacted array to allow hybridization of nucleic acid in the sample to the oligonucleotides of the array; subjecting the hybridized array to a cleavage agent which cleaves incompletely hybridized oligonucleotides but does not cleave completely hybridized oligonucleotides; washing the cleaved array; and assessing a pattern of negative and positive signals on the washed, cleaved array, wherein a negative signal corresponds to an incompletely hybridized oligonucleotide that was cleaved by the cleavage agent, thus removing the label, and a positive signal corresponds to an oligonucleotide that was not cleaved by the cleavage agent, thus retaining the label.

Abstract: Assays for analyzing or genotyping a test sample comprising nucleic acid are described, wherein the assays comprise contacting a prepared test sample containing nucleic acid with an array comprising a set of oligonucleotides attached to a solid support at identifiable locations, wherein each oligonucleotide in the set comprises a first boundary sequence at a proximal end of the oligonucleotide, a second boundary sequence at a distal end of the oligonucleotide, a nucleic acid marker between the first and second boundary sequences, and a label at the distal end of the oligonucleotide; maintaining the contacted array under conditions which allow hybridization of nucleic acid in the test sample to the oligonucleotides of the array; subjecting the hybridized array to a cleavage agent, wherein the cleavage agent cleaves incompletely hybridized oligonucleotides but does not cleave completely hybridized oligonucleotides; washing the cleaved array to remove cleavage products from the cleaved array; and assessing a pat

Abstract: A programmable chip enable provides for enabling or disabling an integrated circuit in response to a selected one of a plurality of logic signals. In a specific application, the programmable enable function is used in combination with a plurality of field programmable memory devices. The enable functions of the respective devices are programmed to prevent simultaneous enablement of the memory devices which have their outputs connected together.

Abstract: A programmable chip enable provides for enabling or disabling an integrated circuit in response to a selected one of a plurality of logic signals. In a specific application, the programmable enable function is used in combination with a plurality of field programmable memory devices. The enable functions of the respective devices are programmed to prevent simultaneous enablement of the memory devices which have their outputs connected together.

Abstract: A programming arrangement for programmable matrices which have a plurality of memory elements, input terminals for addressing the elements, input/output terminals for receiving a signal from an addressed element when the matrix is operated in a READ mode, and for receiving programming signals when the matrix is operated in a PROGRAM mode, and a programming current supply source. The arrangement provides for controlling the flow of programming current to any of the memory elements by application of programming signals to less than all of the input/output terminals. A programming decoder is provided having inputs connected to the input/output terminals and outputs connected to apparatus for controlling the flow of programming current. The decoder expands the programming utility of the input/output terminals and, thus, allows for programming of redundant rows of columns, programmable output polarity apparatus, and other special matrix features via the available device pins.