Abstract: A method of and apparatus for optimizing the data transfer rate from a dynamic storage subsystem to an asynchronously clocked requestor using a variable rate oscillator and a first-in-first-out or FIFO buffer. On writing data into the dynamic storage subsystem, data is transferred from the requestor to the FIFO buffer and the variable rate oscillator clocks the data from the FIFO buffer into the dynamic storage subsystem at some relatively slow rate. If the FIFO buffer begins to fill, the frequency of the variable rate oscillator increases causing data to be clocked from the FIFO buffer at a higher rate. On reading data from the dynamic storage subsystem, the variable rate oscillator begins at a maximum frequency clocking data into the FIFO buffer from where it is transferred to the requestor. If the FIFO buffer beings to fill up, the frequency of the variable rate oscillator is decreased.

Abstract: In a disc pack data storage system that has a plurality of discs and a plurality of heads for coaction with the discs, a tachometer for producing a signal indicative of the radial speed of the heads with respect to the discs. At least one of the disc surfaces is a servo surface and at least one of the heads is a servo head so that in response to radial movement of the servo head a triangular position signal is produced. Sampling pulses indicative of specific radial positions of the head are derived from the position signal so that the time required for the head to move between two positions represented by adjacent sampling pulses is inversely proportional to radial head speed. Control and computing circuitry measures the time between adjacent pulses by providing a clock pulse source and counting the number of clock pulses that occur between adjacent sampling pulses.

Abstract: Apparatus for sensing marks on a moving paper object includes light source means for transmitting light through a portion of a partially opaque mark and into the translucent fibers of a paper object. Light detecting means are provided for sensing the relative amount of light transmitted into said fibers by detecting the light in said fibers under said mark at an area transversely disposed from the portion of the mark where the light was applied.

Abstract: An electromagnetic linear actuator for positioning a transducer over locations on a rotating magnetic recording disk comprising an actuator housing used as a stationary base for supporting various parts; a coil and cart assembly including a cart, having a rectangular cross section and tubular in construction, adapted at one end to support the transducer, and including a direct current coil with a cross section matching that of the cart mounted at the other end thereof; magnetic means affixed to the actuator housing having an air gap for receiving the coil so that the coil is immersed in a magnetic field; and support means affixed to the actuator housing engaging the surfaces of the cart and disposed about the center of gravity of a moving-mass assembly consisting of the coil and cart assembly and the transducer.

Abstract: Apparatus for distributing evenly delayed digital signals to a plurality of separate physical locations in which each location utilizes one particular digital signal. At each physical location an apparatus for adjusting the timing delay of the digital signal is provided so that all physical locations may utilize the digital signals, as for example, a pulse from a timing chain, at the same instant of time with respect to each other. The apparatus for adjusting the timing delay at each location includes a receiver for accepting the digital signal. After the receiver, the digital signal is routed to both a delay line capable of providing a plurality of time delays and to a selector having an input for the received digital signal and for each one of the time delays provided by the delay line. Finally, each selector provides a means of selecting just one of the signals to be utilized at that physical location.

Abstract: As an aid in counting servo tracks in a position servo system, a position window detector (30) which normally provides coarse and fine pulses to counting logic (53) also provides fine pulses to a reset switch (45) of a tachometer signal integrator means (33), resetting the integrator once for each track. In the event of position signal drop-out wherein coarse pulses are not properly generated, a threshold detection means (43) senses when the output of the integrator reaches a threshold level and produces a threshold reached signal which is transmitted to counting logic means (53) for incrementing a track counter (61).

Abstract: A mechanism in a computer system translates a program-generated virtual address into a real address of at least a portion, such as a byte, of a segment of the storage of the computer system. The translation mechanism is operable in either of two modes for forming the real storage address. In either mode of operation of the translation mechanism, a first portion of the virtual address is utilized to select a predetermined one of a plurality of segment descriptors, each having a first field portion and a second field portion.

Abstract: An apparatus for and a method of parallelizing the conjugate deflected light beams of a magneto-optic light deflector system. The apparatus includes two converging half-lenses, the centers of which are removed. The two converging half-lenses are oriented superposed with their centers aligned along the center of the light beam that is directed normally incident to the plane of the magneto-optic light deflector. A converging lens is oriented in the optic axes of the parallelized conjugate light beams for focusing the two parallelized conjugate light beams upon a screen or detector.

Abstract: There is provided a circuit and method for subtracting floating point numbers which are represented by binary bits. In this circuit, the smaller number (minuend) in one register is arranged so that the complement thereof is denormalized and added to the subtrahend (i.e. larger number) and the result of the addition is returned to the original register. At that time, the signal stored in the register is renormalized. In this circuit, the number of guard bits required to guarantee round off accuracy is only two.

Abstract: This invention is directed at an apparatus and method for detecting zero operand information and which also serves to detect trailing zeros. This circuit has application in computer circuitry, systems or the like wherein elongated information trains represented by multiple words of multiple bits are multiplied by equally long information trains. In many cases, the trains comprise a plurality of trailing zeros which, in accordance with the operation of this circuit, can be detected whereby the multiplication operation can be significantly speeded by avoiding unnecessary multiplication by zeros without loss of accuracy.

Abstract: The present invention is a method and apparatus for passive generation of magnetic bubbles in thin layers of magnetic materials, such as garnets, and uses specially designed permalloy elements which with the rotation of an in-plane magnetic field act to generate magnetic bubbles over a wide range of bias magnetic field values. The design of a special permalloy element includes an angular portion and a contiguous remaining portion having a large surface area relative to the angular portion. Pulsing of the in-plane rotating field to higher field values as it passes through a predetermined orientation with respect to the angular portion generates magnetic bubbles in a controllable manner for fixed values of the bias field.

Abstract: A rinse process for solvating adhered primary melt residue from magnetic garnet crystals grown via liquid phase epitaxial (LPE) techniques. The rinse melt consists of a mixture having a saturation to nucleation temperature range that encompasses the primary melt's growth temperature and a solvent compound different from that used in the primary melt, which will solvate the solvent used in the primary melt and will not produce undesirable rinse melt adhesion.

Abstract: A real time digital graphics display system is disclosed for generating circles, arcs and vectors. The system utilizes Taylor's formula to determine the successive coordinates of the points along the image of the character displayed. The system is able to display a given graphical character once given the coordinates of a start point, an end point and the number of increments to be displayed if an arc is to be displayed.

Abstract: An apparatus for and a method of utilizing a magneto-optic stripe domain light deflector for both the transmitted and received light beam.

Abstract: A block replicate bubble memory device is provided with a plurality of series storage loops, wherein data words are written into or read out of the storage loops in parallel. The data is entered into write lines and is read on to read lines which are connected to the series storage loops approximately one-half of one loop time apart. Information in the storage loops is ordinarily changed or altered in no less than one-half of one loop time in the prior art. The present invention provides a plurality of bubble generators connected to the serial write line in a manner which permits several bubble device functions to be conducted in less than one-half of one loop time.

Abstract: An electrically and mechanically modular design of a high impedance, passive tap is disclosed for use in distributed, serial transmission systems to provide a tap connection to the primary transmission line with minimum loading and reflection. The tap is comprised of the cable connectors and a microstrip circuit compatible with an associated transceiver.

Abstract: A disk drive control system incorporating an internal microprocessor and internal testing capabilities. The disk drive control system is capable of simulating drive operation without carriage motion so as to test substantially all functional subsystems of the disk drive. The test technique comprises the exercising of subsystems and a diagnosis of operations according to a hierarchy of interdependence of subsystem operation.

Abstract: A full wave (RMS) bridge circuit is disclosed for regulating a nominal 200 to 240 V AC bulk voltage to a nominal 300 V full wave rectified DC bulk voltage for all line and load conditions. The circuit automatically adjusts to varying line voltages and operates in any one of four modes: (i) full wave bridge, (ii) phase controlled bridge-doubler, (iii) phase controlled doubler, or (iv) non-controlled doubler to maintain the nominal DC output voltage.

Abstract: The present method and device provides that a thickness of wet ceramic material is laid down and partially dried to provide a base. This step is followed by screen printing one or more patterns of electrical resistance material on the upper surface of the partially dried ceramic base. Thereafter a second thickness of said wet ceramic is laid down and partially dried. In the event that the fabricator desires to provide a plurality of resistance paths, or a capacitor, in a single package, the foregoing process can be repeated with additional patterns of resistance material laid down or conductor material for a capacitor laid down, on the upper layer of partially dried ceramic material. The resistance or conductor patterns are sandwiched by additional thicknesses of ceramic materials screen stacked thereon. When the desired package has been achieved, the multi layered arrangement is given a final drying and it is then diced and fired.

Abstract: A common-emitter amplifier having its dynamic voltage gain controlled by using a controlled emitter-follower to shunt the emitter impedance of the common emitter amplifier.