Abstract: An adjustable magnetic bias field structure for magnetic bubble devices. A pair of parallel facing magnetically permeable plates are adjustably separated by a number of threaded magnetically hard cylindrical rods or slugs slotted at one end. Threaded plastic rings fastened around holes provided in the pair of permeable plates engage the threads of the slotted rods to provide the adjustment feature. A magnetic bubble device is placed between the two permeable plates.

Abstract: A method for separating the signal carrying conductors from the ground conductors in a plural conductor flat cable to enable the connection of the ground conductors to a grounding plane and the insertion of the signal conductors into the terminals of a connector block. The method comprises the steps of severing the insulation surrounding the ground and signal conductors in a flat conductor cable, sliding the severed insulation along the conductors away from the main body of the cable, bending the ground conductors at right angles with respect to the flat cable, and sliding the insulation back along the signal conductors until it abuts the main body of the flat cable.

Abstract: The fixture comprises an insulating housing of synthetic resinous material which carries two sets of switches which number, in total, the number of terminals on an integrated circuit (IC) to be tested. Each switch has a manually operable arm or lever which can be placed in three separate positions, an upper position, a center position, and a lower position; and the switch has three terminals, an upper terminal, a center terminal, and a lower terminal, one for each position of the operable arm. All of the upper switch terminals are connected together to a first common plug, and all of the lower switch terminals are connected together to a second common plug, the two plugs being adapted to be inserted into a test device such as a curve tracer. Each center terminal is connected separately to a terminal on a zero-insertion force socket, into which the pins of the integrated circuit under test can be inserted.

Abstract: The disclosure is of facsimile apparatus having support means for holding a telephone handset during operation of the machine in receiving or transmitting a message. This means comprises a seat of rubber on which the handset rests, and, in addition, a ring of smooth material on which the handset slides as it is brought into engagement with the support means and as it is slipped into its operating position with respect to the support means. The apparatus also includes a novel, spring support arrangement for the handset support.

Abstract: Method and apparatus for providing coarse and fine radial positioning of a multiple head assembly relative to the concentric tracks of a rotatable magnetic disk. In addition to a plurality of data heads, the head assembly also includes a pair of position sensing heads having skewed core gaps disposed at an angle with respect to each other. These position sensing heads are used for prerecording concentric position control tracks on the disk as well as for subsequent sensing of position control information during both coarse and fine positioning operations. The position control information prerecorded in the position control tracks is specially chosen so as to provide a pair of pulse trains during position sensing having characteristics such that highly accurate and reliable control of head position can be achieved based upon a detection of the coincidence relationship between predetermined pulses of the respective pulse trains.

Abstract: A facsimile machine includes a cylinder for supporting a paper which is to receive a message or which carries a message to be transmitted by telephone lines to a remote location. The machine includes a read-write assembly which is mounted for movement back and forth across the paper-carrying cylinder. The read-write assembly includes a light assembly for directing light onto a printed document, a stylus for printing electrostatic charge on a blank sheet of paper, and a relatively simple mechanical apparatus for switching the machine from the read status to the write status.

Abstract: In a high speed document printing system a hole mask circuit is provided to compensate for erroneous indications of the entry of additional documents into the system due to the sensing of a discontinuity or aperture within the body of a valid document. The hole mask circuit receives a document present signal from an associated sensor and employs a retriggerable timing means to inhibit the recognition of an additional document unless the sensor has previously signaled the continuous absence of a document for a preselected time interval. The circuit is capable of discriminating between a valid document having apertures of a preselected maximum size, documents having invalidly sized apertures and spacings between successive documents.

Abstract: A recorder for a cartridge-enclosed disk includes a loading and unloading mechanism which utilizes a cam and cam-follower to enable a cartridge-receiver unit to automatically open the recorder's pivoted door when the receiver unit itself pivots from an operative to a loading/unloading position. The cam and cam-follower also enable the door to pivot the receiver unit to the operative position when the door is manually closed following insertion of the disk cartridge. A manually-releasable latch holds the receiver unit in its operative position against the action of a pivot-inducing bias spring. Until activated to allow the receiver unit to force open the door, the same latch also holds the door in its closed condition.

Abstract: Improved means and methods are described for continuously and asynchronously testing and diagnosing the operation of a digital circuit or unit. A predetermined plurality of test signal segments are concurrently applied to the unit under test and to a standard unit. The respective outputs of these units are then continuously and asynchronously compared to determine whether, at any time, these outputs are out of skew for at least an adjustable predetermined minimum time period. The detection of this excessive out of skew condition is used as an indication of an actual or potential failure. The segment and clock for which the failure occurs is determined and looping of the error segment is provided as an aid in diagnosis.

Abstract: In a network for transferring a source field in a source word into a destination field in a destination word two basic hardware sub-functions are utilized: rotation and mask vector generation. In the network the destination field of a destination word is masked. Concurrently in the network, a source word is rotated bringing the source field thereof into corresponding alignment with the masked destination field and all but the source field of the source word is masked. Subsequent logical combining of the masked destination word and the rotated and masked source word generates the desired field transference. In one embodiment the required masking operation is accomplished during a single pass of the destination and source words through the network. In an alternate embodiment using less masking hardware only half of the required masking is accomplished during each pass and two passes are required before the logical combining to achieve the desired field transference.

Abstract: A bit addressable, variable field memory system partitioned into a plurality of individually addressable memory stacks and employing time-shared accessing circuitry in conjunction with the use of serial, multi-phase accessing of the memory stacks, whereby the advantages of serial memory stack accessing are achieved without significantly increasing the overall memory accessing time over that obtained for parallel accessing.

Abstract: The disclosure is of a facsimile machine having a carrier for a sheet of paper, the carrier comprising a cylinder having a longitudinal band secured thereto by springs so that the band is normally pulled downwardly onto the surface of the cylinder. A sheet of paper is rolled about the cylinder, with one end of the sheet of paper held securely between the band and the cylinder.The cylinder is mounted on a machine frame which includes a cover plate which is pivotally mounted over the paper-holding cylinder. The cover is provided with a finger which serves no purpose when the cover is closed, but, when the cover is opened, the finger engages a bracket which itself engages the longitudinal band to lift it from the surface of the cylinder to permit a sheet of paper to be inserted or removed.

Abstract: An adjustable clamp includes two overlying, interfitting, L-shaped members together with an anchor screw. A panel is held in an adjustable space between the arms of one portion of each L. The arms in the other portion of each L interfit through a set of interdigital bands and apertures formed in the respective arms. The interfitting arms are slideably adjustable relative to each other. The anchor screw, which can attach the clamp and held panel to a support surface such as a printed circuit board, passes between the interfitting arms to secure them together while simultaneously causing their relative sliding movement to produce the adjustable clamping action.

Abstract: A structure for an easily testable single chip calculator/controller comprising an arithmetic logic unit (ALU) and a plurality of active storage elements all interconnected in parallel via an input bus and an output bus. Instructions contained in a read only memory (ROM) are read out into an instruction register. A first means is provided for decoding a portion of the instruction to generate a configuration signal for selectively configuring the logic elements of the ALU. A second means is provided for decoding the remainder of the instruction to generate a register select signal for selectively actuating a chosen storage element. Two test pins are provided, one placed in the input bus and the other placed in the output bus. The test pins are placed in the test mode by the application of a TEST signal to their terminals. Signals from the test pins will be routed to outside diagnostic or testing equipment.

Abstract: Improved means and methods are described for continuously and asynchronously testing the operation of a digital circuit or unit. The testing approach is based on determining whether an output signal from the unit under test is out of skew with a corresponding output from a standard unit for at least an adjustable predetermined minimum time period.

Abstract: Disclosed is a fabric covered ink roll and method of making same. The ink roll has side washers with peripheral lips clinching the fabric cover into the roll. The method disclosed can be performed semi-automatically using a collapsible mandrel which permits the roll to be covered with fabric and the fabric clinched to the roll.

Abstract: Disclosed is a positioning system and method particularly useful for so-called floppy disks for positioning a device with respect to a reference on a disk in accordance with a command signal despite temperature and humidity variances.

Abstract: The disclosure is of a display panel which includes a gas-filled envelope which contains cathodes and anodes spaced apart from each other and formed into rows and columns of dotlike cells by an insulating cell sheet. The insulating sheet is of a glassy material and is coated with an opaque, slightly reflective, resistive material such as silicon. The coating provides good display contrast by hiding the cathode glow of the priming cathodes in the panel.

Abstract: A stored logic Boolean function generator having a control word storage coupled to a control block for selectively configuring the control block into logic circuits for simulating either a logical AND circuit or a logical OR circuit for operating on binary signals. At least two external addressable binary signal stores are coupled to the control block. The two external addressable stores alternately and oppositely serve as source and destination storage devices for binary signals which are operated upon by the control block. One of the addressable stores serves as a source of binary signals which are supplied to the control block and operated upon by the logical circuit simulated therein. The results of the logical manipulation are stored in the other of the externally addressable stores which thus serves as a destination storage device.

Abstract: A display panel includes a generally flat gas-filled envelope which comprises a base plate and a face plate hermetically sealed together. The base plate carries a plurality of groups of cathode segments, and the face plate carries a transparent conductive anode for each group of cathodes. The anodes are formed by a screening process, and they comprise a matrix of cadmium and indium oxides and various other metal oxides.