Abstract: A method and apparatus for effectively doubling the operational speed of certain digital circuit designs. In particular, a digital clock operating at a first frequency is utilized to effectively drive TTL shift registers at twice the frequency of the digital clock. This effective doubling of the clock speed is achieved without the necessity of resorting to expensive and high power consumption circuit designs.

Abstract: A method and apparatus for sensing the polarity of an input pulse train signal and for automatically changing its polarity as required by the circuit to which it will be applied, is disclosed. The polarity of the input pulse train signal is determined by an averaging network that detects the average DC level of the signal. The averaged signal is compared with one representing the desired output signal polarity to provide a control signal which is used to determine whether the input signal is of the proper polarity to form the output signal or whether it must first be inverted. The phase and timing parameters of the output pulse train signal match those of the input signal.

Abstract: A speed typing method and apparatus for use in association with a word processor (5) are disclosed. An encoded Key (40) of alphanumeric characters and its associated Replacement Text (41) are pre-stored (50-67) in Memory (12). Operator entries to the processor are divided into segments of character entries bordered at their opposite ends by "space" or "carriage return" entries. Each segment is compared (70-97) with the pre-stored Key entries, and whenever identity is found (98), that segment of characters is replaced by the pre-stored Replacement Text associated with the identified Key (99-101). The initiation of the comparison process requires no special function Keys or steps to be performed.

Abstract: A linearity correction circuit for high speed horizontal scanning is disclosed. The correction circuit uses high speed, fast recovery components capable of operating in the fifty to one hundred kilohertz range. A variable inductor is tapped directly to the flyback transformer, the variable nature of the inductor giving a range of correction for linearity. The inductor is connected to a capacitor and a damper diode with a diode so that the voltage built up across the capacitor, which is connected to the deflection coil, causes the damper diode to conduct early, thus correcting linearity of the circuit. Using a minimum number of components a highly efficient circuit is provided both in operation and cost of construction.

Abstract: A dynamic new circuit is disclosed which permits an extremely high resolution cathode ray tube display. Utilizing this circuit, horizontal drive operating frequency may be increased by a factor of approximately four and video drive operating frequency may be increased by a factor of approximately ten. Improved circuits for horizontal drives vertical drive, video drive and associated circuitry are disclosed which cooperate to produce a high frequency display which has unparalleled clarity and resolution.

Abstract: A dynamic new circuit is disclosed which permits an extremely high resolution cathode ray tube display. Utilizing this circuit, horizontal drive operating frequency may be increased by a factor of approximately four and video drive operating frequency may be increased by a factor of approximately ten. Improved circuits for horizontal drive, vertical drive, video drive and associated circuitry are disclosed which cooperate to produce a high frequency display which has unparalleled clarity and resolution.

Abstract: A dynamic new circuit is disclosed which permits an extremely high resolution cathode ray tube display. Utilizing this circuit, horizontal drive operating frequency may be increased by a factor of approximately four and video drive operating frequency may be increased by a factor of approximately ten. Improved circuits for horizontal drive, vertical drive, video drive and associated circuitry are disclosed which cooperate to produce a high frequency display which has unparalleled clarity and resolution.

Abstract: There is disclosed a typewriter carriage control mechanism which is used with a single element print head which is constructed and arranged for transverse movement across the typewriter in which a ratchet wheel is connected to the regular spring for moving the carriage in a first direction and having a sensor disclosed in ratchet wheel tooth confronting relationship which provides signals representative of radial movement of the ratchet wheel in which the wheel rotational movement is controlled by pawl devices which is actuated by a pair of solenoids to control the forward movement of the carriage. The backspacing movement of the carriage is controlled through another solenoid mechanism and each of the solenoids are controlled through the use of electronic circuits which receive data information representative of the printing function and the functions of spacing, carrier return, line return, tab, back space, and a nonescapement and correction feature operation.

Abstract: A shared resource system (20) is disclosed wherein multiple user devices (24) share a resource device such as a disk drive (36). The multiple user devices (24) are interconnected to the resource device by high speed synchronous serial data links (26). Each of the user devices (24) include a serial to parallel/parallel to serial converter means (22) for converting and transmitting on the high speed synchronous serial data links (26) user device requests to access the resource device. The resource device includes a serial to parallel/parallel to serial converter means (30) for converting and transmitting such user device requests on a parallel data bus to the resource device. The resource device converter means (30) including multiple access ports (54) to enable multiple user devices (24) to access the resource device, the converter means (30) individually and periodically polling each of the access ports (54).