Abstract: A plurality of modular arrays, each structured from a common module, are connected together so as to form a binary quotient by successive approximations. For divisors that fall into that group of numbers that have reciprocals with a reasonably short period, the forming of a quotient with such a divisor and any dividend can be greatly accelerated after the add and shift sequence for the first period of the divisor reciprocal is obtained. A unity array, divisor array, dividend array, and quotient array may all be of equal length, but must be longer than the length of the periods of the reciprocals of the divisors utilized. The reciprocal of the divisor is effectively formed in the divisor array by generating a shift and add sequence that will produce a product that is a series of binary ones. After the first period of the divisor reciprocal is formed, the binary bits of the reciprocal start to repeat for the second period, and so on.

Abstract: The present disclosure describes a device for checking the dc characteristics of electronic nets disposed for example in assemblies utilized in data processing equipment. The operation of the analyzer assumes the presence of one or more controlled impedance nets, as may be achieved through the use of current mode logic configurations. The device which is employed while the circuit under test is in a power-off condition, first determines which type of net is being tested, passes a current of known magnitude through the net, and then compares the actual voltage developed thereacross with expected voltage values falling within a tolerance range. The voltage corresponding to the nominal impedance of the net and the tester current passed therethrough, lies at the center of the range. The analyzer automatically checks all the pins of a monolithic integrated circuit chip in sequence. If the nets associated with all the pins fall within the tolerance ranges, a "good" indication occurs upon test completion.

Abstract: A circuit for controlling the height of a bar graph display in response to a digital input signal. A first count, representing the particular cathode segment of the bar graph under energization, is developed by a counter which monitors the clock signal driving the bar graph display. A second count is developed by a counter stepped by a clock when the digital input signal is in a selected logic state. At the end of a selected interval, the counters contents are transferred to a register for supply to a digital comparator, which compares the first and second counts and produces a control signal upon their equality.

Abstract: A printed-circuit board requiring precious metal electroplating of its contact finger areas is adapted for such plating by a temporarily affixed electroplating current carrier of metallic foil held in contact with other printed wiring interconnected with the contact finger areas. The metallic foil is shielded from contact with electroplating baths by a strip of dielectric plastic film, the film and the foil being temporarily held in a selected position on the board by a layer of non-setting pressure-sensitive adhesive.

Abstract: The present disclosure describes a wire guide for use with a manually operated wire wrap gun. Such guns are used to make solderless wrapped connections on terminals emanating from a circuit board. The wire guide of the present invention is especially useful with multi-spindle guns, such as the dual spindle gun utilized for simultaneously wrapping both wires of a twisted pair or miniature coaxial cable. The present wire guide which is fastened to the sleeve portion of the gun, permits the operator to front load the gun quickly and reliably by directing the multiple wires into the respective wire feed openings of the wrapping tool bits housed within the sleeves.

Abstract: The present disclosure describes semiconductor devices and circuits for sending and receiving data at high speed between computer modules with excellent noise immunity and low drive power. The semiconductor circuits are arranged to send data single-ended and to receive data differentially. As is required for full duplex operation over a pair of wires, the circuit arrangements are such that a driver in a given driver/receiver module does not influence the incoming data.

Abstract: This disclosure relates to a programmable unit employing plural levels of sub-instruction sets in addition to conventional instruction sets. The conventional level of instruction sets is employed to specify computational routines and other processing algorithms to be carried out by the unit. Each instruction in a conventional set is implemented in the unit by a sequence of first level sub-instructions which specify the various operations to be carried out within the unit which operations are comprised within the specific routine. In turn, the various first level sub-instructions are implemented by second level sub-instructions which specify the various control signals required to set the various gates as required for the particular unit operation to be carried out. With this hierarchy of sub-instruction sets, first level sub-instruction sets may be interchanged dynamically during the operation of the unit to dynamically change the processing capability of the unit.

Abstract: This disclosure relates to a programmable unit employing plural levels of sub-instruction sets in addition to conventional instruction sets. The conventional level of instruction sets is employed to specify computational routines and other processing algorithms to be carried out by the unit. Each instruction in a conventional set is implemented in the unit by a sequence of first level sub-instructions which specify the various operations to be carried out within the unit which operations are comprised within the specific routine. In turn, the various first level sub-instructions are implemented by second level sub-instructions which specify the various control signals required to set the various gates as required for the particular unit operation to be carried out. With this hierarchy of sub-instruction sets, first level sub-instruction sets may be interchanged dynamically during the operation of the unit to dynamically change the processing capability of the unit.

Abstract: Modulo M translation is performed on a large binary number of n bits by grouping the binary number in contiguous sets of approximately K bits each, storing the modulo M residues for each K bit set in an individually associated pre-stored ROM, reading the modulo M residues for a particular K bit segment of a binary number out of the ROMs, and performing modulo M addition on the read-out residues. Thus, modulo M translation of a positive number is accomplished in n/k modulo M additions and a table look-up, with the look-up table being stored in n/k ROMs. A subsequent modulo M subtraction is performed if the binary number is negative.

Abstract: The present disclosure describes an improved dressing finger for use with automatic wiring machines. Such machines are used to make solderless wrapped connections on terminals emanating from a common plane. The dressing finger which is used to form predetermined wire patterns is associated with a wrap tool which makes the actual connection. In present day machines, the distance relationship between wrap tool and dressing finger is fixed in one axis and the terminal grid arrangement which is dependent thereon is likewise fixed. The dressing finger of the present invention permits a combination of grids or fixed grids within a predetermined range, thereby providing greater flexibility in the design of the terminal panel.

Abstract: An improved microinstruction memory addressing method and apparatus within a serial-bit microinstruction processor incorporating internal, serial-byte transfer, is provided by addition to and alteration of memory control circuitry wherein the resulting permissible microinstruction set for controlling the processor may be expanded to include a CALL, GO-TO and EXECUTE operations, thus increasing the programmatic capabilities in the processor. The micro-code needed to define more complicated program operations, and thus the time used to perform these operations, may therefore be greatly reduced. Changes may also be made in existing timing circuitry.

Abstract: The present disclosure describes electrical circuit means for providing an automatic power restart for unattended electrical equipment, such as computer cabinets, after an AC power failure and subsequent power restoration. The restart function is performed without interfering with the normal cabinet power sequencing during attended operation or maintenance. The circuit which utilizes a latch-in type relay to "remember" the last manually selected power control setting has general utility in new installations, as well as being adaptable to existing cabinet power systems.

Abstract: A control for a resistance solder unit for maintaining solder probe temperature within an acceptable range is provided using a redundant interlocking switching circuit. A pair of dual, single pole, single throw, variable time delay electronic relays, and a pair of dual, single pole, single throw electrical relays may be interconnected into the supply line for the AC to DC soldering transformer to control the time and duration of current to a resistance soldering probe. Included may be an autotransformer-coupled feedback from the resistance solder ground return of the soldering probe. Typically, visual and audible signals provide probe power status.

Abstract: An item carrier for an item transport system wherein the carrier member is provided with means automatically adjustably movable as a result of the pendulum effect or tilt of the item effective to prevent accidental dislodgement or disengagement of the item from the carrier while simultaneously causing the tilt or pendulum movement thereof to continuously move the item into a tighter engaging position in the carrier with each tilt or swing.

Abstract: A connector or receptacle is described for connecting a leadless integrated circuit package to an interconnection medium such as a printed circuit board without the need for soldering connections. A significant feature of the connector is that all of its electrical contacts may be engaged or probed individually or collectively from the package side of the interconnection board for diagnostic and test purposes. Probe means suitable for use with the connector are also described.

Abstract: A system is described which provides for high density packaging of electronic equipment, particularly data processing systems. Subnanosecond integrated circuits of the LSI or MSI type in pluggable packages are adapted to be installed in receptacles or connectors. A cooling frame is provided which supports the package connectors as well as the package-to-package interconnection medium. In accordance with the system, groups of integrated circuit packages logically partitioned into functional elements and having, for example, gate complexities of the order of four thousand to ten thousand gates, comprise an island. The system may be expanded further by interconnecting several islands.

Abstract: A hold down device is described for applying a high clamping force to a "leadless" integrated circuit package installed in a suitable connector. Use of the device results in reliable electrical connections between the package circuit leads and the connector contact elements; and reliable thermal connections between the package carrier and a cooling frame provided to dissipate the heat generated by the integrated circuits. The hold down device has added system utility in the clamping of an interconnect cable assembly adapted to plug into the aforementioned connector in lieu of the integrated circuit package.

Abstract: A demountable document receiving tray or gauge member is provided with means for adjusting the lateral location of a document relative to the printing position of a MICR imprinting apparatus so as to position the document at any one of a multiple set of full field MICR printing positions. Structure operably associated with the document receiving tray permits automatic actuation of the MICR printing mechanism by insertion of a document. Also included is structure providing a time delay preventing accidental actuation of the document printing structure after withdrawal of the document.