Abstract: A method of controlling the unauthorized disclosure of classified data that is used to describe an event that has been calendared in an electronic calendaring application of an interactive information handling system in which the calendar owner assigns a security classification to an event as it is being calendared. The classification assigned is pre-established by an information security protocol that is either unique to the calendar function or a more comprehensive information security system for the organization. The security classes are pre-established by the system. When the calendar data is presented in a format that allows event descriptions to be readable such as when a day calendar is viewable on the display terminal or in a printed copy, an overall security lable is displayed and printed out when the display is converted to hard copy. The period covered by the security label generally corresponds to the period that is selected for viewing.

Abstract: An electronic calendaring method for use in a data processing system in which calendar entries that have been made for the same time span independently on two different copies of the calendar can be automatically and interactively reconciled. The method permits a calendar owner to obtain a machine readable transportable copy of his calendar on a diskette, to update that copy when the master copy is not available to him because of a business trip, for example, and upon his return to automatically and interactively reconcile the updated entries that have been made to both copies so that at least one of them reflects the correct status of calendered events for that owner.

Abstract: A method controls the printing of documents created by interactive text processing systems so that the document image is positioned on the paper in the same location when the document is printed by two different printers with different paper positioning parameters. The method assists the operator in defining to the system the paper positioning parameters of each printer attached to the system so that the location of the first print position of the printer is established relative to the top and left edges of the paper. The text processing program also establishes the location of the first print (typing) position of the document image on the display relative to the top and left edges of the document image. Printer control codes are developed and sent to the printer which align the edges of the document image with the corresponding edges of the paper at its initial printing position by taking into account the relative locations of the first print positions of the printer and document image.

Abstract: An MR sensor is disclosed in which a pair of thin film magnetoresistive strips are connected electrically in parallel between two terminals. Strips are spaced apart a distance which is small relative to the density of the stored data to be sensed. The strips are mutually-biased in opposite directions to corresponding points in the linear region of their respective curves by current from a constant source attached to one terminal. Since the resistance of each strip is equal, the current divides equally between the strips.The sensor is positioned adjacent the magnetic surface containing stored data. Vertical components of the magnetic field (preferably vertically recorded data) influence the resistance of the strips differentially. When the sensor encounters a vertical flux transition, the output voltage varies to produce a unimodal type pulse.

Abstract: A method is disclosed for assisting the operator of an interactive text processing system in the interactive selection of text processing tasks from a combined program/work diskette. The method involves displaying to the operator a "special" menu which is dynamically developed from information obtained during the creation of the combined program/work diskette, which menu reflects text processing task programs that have been combined on a combined program/work diskette. The combined program/work diskette is created by transferring to a diskette sets of programming modules where each set represents a different text processing task and originates from a different program diskette that is selected interactively by the operator during the creation of the combined program diskette. The special menu informs the operator what specific text processing tasks out of a large group of text processing tasks have been combined on the diskette and are now available to the operator for execution.

Abstract: An adjustable filter arrangement is disclosed which is implemented in integrated circuit technologies. The filter configuration corresponds to a SALLEN-KEY filter in which the amplifier function is obtained by a transistor device, the R1 and R2 resistor functions are obtained by a first pair of suitably connected diodes, and the C1 and C2 functions are also integrated into the semiconductor chip. Adjustment of the natural frequency of the filter is obtained by the value of an externally supplied control current through the pair of diodes corresponding to R1 and R2. Adjustment of the damping characteristic of the filter is obtained by supplying a second control current to cause a relative change between the values of R1 and R2. No external components need be attached to the integrated circuit filter.

Abstract: A syndrome processing unit for a multibyte error correcting system is disclosed in which logical circuitry for performing product operation on selected pairs of 8-bit syndrome bytes and exclusive-OR operations on selected results of the product operations are selectively combined to define usable cofactors that correspond to coefficients of an error locator polynomial corresponding to a selected codeword if the codeword contains less than the maximum number of errors for which the system has been designed.

Abstract: A method of operating a large fault tolerant semiconductor memory is described which increases the probability that data words read from memory will not contain uncorrectable errors. The method involves storing a data word at a location in memory that may have a defect in either the true form or compliment form depending on which form will be perceived by an error correcting system as containing no errors on readout. Each data word transferred to memory is tested to see if one form or the other results in an error on readout. If the true form results in an error indication, the data portion of the word is stored in compliment form and the check byte stored in true form.On a subsequent transfer of the word from memory, the ECC system indicates an apparent uncorrectable error resulting from both portions of the word being stored in a different form while in fact the uncorrectable error indication is a signal that the data portion was stored in compliment form.

Abstract: A method is disclosed for insuring that two semiconductor chips which have a 1-bit defect at the same chip address are not paired at any memory address by a fault alignment exclusion mechanism (FAEM) which functions to position chips having defects at different memory addresses. The FAEM employs an error map to determine which chips must be realigned in their respective columns and an address permute vector functions to effectively change the physical address of the chip in the column to a logical address. The two permute vectors for the two columns contributing to any uncorrectable error are "exclusive-ORed" and the result stored in a second map along with an identification of the chip columns. Any time in the future that a new permute vector is proposed for assignment to any column of chips, the changed permute vector is exclusive-ORed with the permute vectors currently assigned to all other columns of the memory to see if any such combination produces a result forbidden by the forbidden result table.

Abstract: A memory system is provided with a simple flexible control arrangement for assigning locations in an alternate memory as replacements for previously identified defective fault areas in main memory. The assignment of the replacement locations in the alternate memory is made on a selective basis taking into consideration the defect status of other failure independent bit positions of a data word and the power of the ECC code which is used in connection with the memory system. A relatively small writable index, which is addressed by a subset of the main memory address signals, provides a partial address and control fields to the alternate memory in accordance with control data transferred from the host system.

Abstract: A magnetic head slider and actuator assembly has an air bearing magnetic head slider that is coupled to an electrical coil. Permanent magnets are positioned in a stationary frame to provide a magnetic field adjacent to the coil. When current is supplied to the coil, it moves within a slot in the frame between the permanent magnets and transports the head slider accordingly. In this way, the magnetic head slider is actuated to access data tracks on a magnetic disk.

Abstract: This zener diode is fabricated by a conventional CMOS device fabricating process whereby an entire electronic circuit can be laid down in one overall process. A semiconductor substrate of one conductivity type has an elongated deposit of semiconductor material of the opposite conductivity type diffused to a predetermined depth to form a well, centrally of which a deposit of enhanced semiconductor material of the same semiconductor conductivity type is diffused to a prearranged depth less than the predetermined depth. Semiconductor material of the one conductivity type is diffused into two elongated regions spaced apart from and on either side of the first elongated deposit while at the same time a quantity of the same material is diffused into the region between said two regions and over the centrally diffused region and doped more heavily than the substrate material to convert the upper part of the control diffusion to the opposite conductivity type for a substantial depth into the well whereby a p.sup.+ n.

Abstract: A real time tachometer is realized in an electromechanical device having a moving member, for example a disk, of nonmagnetic electrically conductive material driven by a suitable moving device, for example a rotating shaft, the velocity of which is to be determined. An assembly of at least one permanent magnet and at least one Hall effect device is arranged for inducing eddy currents in the moving member or rotating disk and measuring them for indicating the relative velocity. The placement and electric interconnection of the Hall effect devices measure the magnetic field provided by the magnet and in an alternate embodiment incorporate compensation for runout and adverse deflection with a rotating disk.

Abstract: This dual operating mode switching power driving circuit arrangement comprises an amplifying circuit of conventional form which is operated substantially as a Class A feedback amplifier in a servosystem "following" mode and is switched to operate as a Class D amplifier in the "seeking" mode under program control calling for the latter mode and reswitched to the "following" mode only at the succeeding transition of the Class D waveform whereby transients are avoided. For operating in Class D mode, the Class A feedback loop is opened and the amplifier circuit is arranged so that the input wave now overdrives the input circuit and drives the output circuit between .+-. values of the energy potential, whereby the efficiency is very high.

Abstract: This electronic circuit device packaging member enables a higher density of substrate pads and connection block pins to be connected at lower cost and greater yield than for prior art devices. The packaging member comprises a multiple of conductors fixed in place by a flexible film carrier of annular configuration surrounding a ceramic substrate bearing electronic circuit components having input/output terminal connecting pads about the periphery of the substrate. Electric circuit connecting blocks having connecting pins are arranged at the periphery of the annular carrier. The multiple of conductors individually interconnect corresponding pads and pins. The film carrier has apertures at the locations of the pads and at the locations of the pins where the conductors or lands are configured for ready connection to the pads and pins, or by gang soldering.The dimensions of the apertures and the conductors or lands afford considerable leeway in making the connections.

Abstract: An improved method is disclosed for assisting the operator of an interactive text processing system. The method assists the operator in entering interactively selection criteria to be used in selecting records from the existing file. The improved method involves displaying to the operator the header portion of the existing file, along with a predetermined number of "qualifying rows" in response to the operator having identified to the system the task to be accomplished and the name and the location of the existing file in the system.The method further involves movement of the cursor vertically and horizontally to row and column positions for entering of the selection criteria. After entering criteria into the displayed rows, the next operation of the cursor down key while in the last row is interpreted as an instruction to the system to add an additional row so that another "logical OR" selection criteria can be added to the previous criteria.

Abstract: A method and system are disclosed for storing data on a magnetic disk file to increase the overall storage capacity of the file without complicating the data management functions and aspects of the connected data processing system. The system involves a magnetic disk having concentric recording tracks where a first inner group of tracks are recorded at one frequency f1, providing optimum track capacity X for these tracks, and a second outer group of tracks are recorded at a second frequency f2, which also provides optimum track capacity for these tracks. At each address position, a pair of magnetic transducers are associated with a different track from each group. During the writing or reading of serial by byte data, the pair of tracks are transduced on successive revolutions. Suitable switching circuitry for switching from one transducer to the other in response to sensing "index" is provided and also for changing the clock frequency.

Abstract: Analytical apparatus is arranged for increased sensitivity in determining a desired characteristic by decreasing the sensitivity to extraneous noise, essentially as common mode signal, while treating the desired signal differentially. Test signal is applied to apparatus comprising an electrochemical cell containing electrolyte in which a pair of matched working electrodes are equispaced from a counter electrode and from a reference electrode. The working electrodes conduct different values of current, the difference being a measure of characteristic of material making up the electrolyte. The signal applied between the counter and the working electrodes is varied over a predetermined range. The potential between the working electrodes is established at zero for basic operation, but a fixed biasing potential is established between the two working electrodes for a given experiment in which the test signal is varied.

Abstract: A single phase induction motor control system employs power line assisted starting and runs at higher than power line frequency from an electronically generated inverter supply. This inverter supply is employed to provide an out of phase mains frequency signal to the run winding during starting in order to create the rotating magnetic field needed to start the motor. After the motor has started, the power line supply is disconnected from the start winding and the inverter supply frequency is increased gradually to a final value corresponding to the desired operating speed. In this system no phase shifting capacitors are needed to provide the out of phase starting voltage and the run winding is optimized for running conditions.

Abstract: A magnetic tape cartridge is disclosed in which a length of magnetic tape is wound on a single reel with the free end of the tape permanently connected to a generally rectangular-shaped leader block. The cartridge completely surrounds the reel of magnetic tape except for an opening provided at one corner of the cartridge. This opening permits tape wound on the reel to be unwound as the leader block is moved away from the cartridge, preferably by an automatic threading mechanism. The cartridge is characterized by one corner of the cartridge through which the tape passes being provided with a leader block receiving well in which the bottom of the well surface defines the opening in the cartridge through which the tape moves.