Abstract: The same basic ROM circuit may be used to provide memories of increased capacity for pre-existing systems having different fixed numbers of address inputs. The appropriate page configuration is selected to accommodate the number of address inputs in the system. The system is adapted to generate a page address signal having the required number of bits on the data bus. The selected page configuration is obtained by mask programming the address decoder and input buffer circuits. The page address signal from the data bus is routed through the data transfer buffers and stored in a RAM for use in conjunction with the row and column address inputs.

Abstract: An active element behaving as a negative resistor is situated in parallel with a varactor to cancel the varactor losses. DC bias is provided for the active element and for the varactor which are separated by a DC block. The entire circuit can be fabricated on a single, relatively small chip. A Gunn diode may be used as the active element if the circuit is formed on a silicon substrate. A field effect transistor may be used as the active element on a gallium arsenide substrate.

Abstract: Audio and control signals are digitized and inserted in the horizontal blanking intervals of the distributed composite television signal. The control signals are in the form of a data stream which includes a header containing group address, sync, and program-related information applicable to all receiving units, and a plurality of portions which are addressable to and contain information applicable to the control of particular individual receiving units in the addressed group. The information in the addressable portions can be altered on a real time basis such that the system operator has direct control over certain functions of individual receiving units from the transmission end.

Abstract: Blank tickets, for use in an instant lottery game or the like, can be imprinted in a secure manner in an enclosed point of sale ticket-issuing apparatus under the control of a central computer. Prior to exposure of the ticket, an adhesive-backed sheet with a scratch-off material coating on areas aligned with the printing is applied to the surface of the ticket. The adhesive will cause obvious damage to the ticket to void same if an attempt is made to remove the label.

Abstract: The print head includes a stationary block of non-conductive material having a plurality of openings into which spark jet capsules are received and a plurality of openings into which electrodes with off-set parts are received. Each electrode is located proximate the end of a different one of the capsules with the off-set part thereof situated in a channel on the block surface extending therebetween. The capsules are arranged in rows transverse to the direction of paper movement. The capsules in each of the rows are slightly off-set with respect to the corresponding capsules in the preceding row. The paper is moved continuously past the block. Actuation of the individual capsules is synchronized with the movement of the paper.

Abstract: The processor has a "U"-shaped transport path with input and output slots in closely situated parallel planes. An overrunning clutch forms part of the transport drive between the reader and the printer to shorten the transport path by permitting the leading edge of the ticket to enter the printer while the ticket is being read by the higher speed reader. The processor can be either horizontally or vertically oriented. When vertically oriented, the input and output slots can be situated on opposite sides of a glass partition to permit customer insertion of a pre-marked ticket.

Abstract: A cryptographic system is used for the secure transmission of digitized signals to a plurality of receivers. At the transmission end, a key consisting of two blocks, each including a plurality of key fragments, is generated. For each transmission session, different sets of key fragments may be periodically selected from one of the key blocks and used to encrypt the signals. Data indicative of the set selection is generated. The key is distributed to each receiver. The set selection data is transmitted to all receivers along with the encrypted signals and used to construct the key fragment set for decryption of the transmitted signals. During the transmission session, the other key block may be varied to form a replacement key which is distributed to each receiver. At the end of the session, the functions of the key blocks are interchanged in all receivers at one time by selecting a set in the varied key block for use in encryption and decryption.

Abstract: Tickets with customer markable areas are insertable into an input slot facing the agent side of the processor, an input slot facing the customer side of the processor, or by either the agent or the customer into an input slot located on the top of the processor. The slots feed different points along an arcuate channel. The end of the channel is located at the beginning of a straight line transport path passing through a ticket reader and a ticket printer to an output slot facing the agent side of the processor. A single drive motor, actuated by a ticket sensor at the end of the channel, provides power to all of the drive rollers. A lock-out mechanism located in the channel prevents tickets from being inserted from the agent side or the top surface if a ticket has been received from the customer side, and prevents tickets from being inserted from the customer side if a ticket has been received from the agent side.

Abstract: Programming tiers are authorized for viewing on an impulse pay-per-view basis. The system operator controls individual receiver units to block the display of programming on selected tiers because the subscriber finds the content of same objectionable or to prevent members of the household from incurring charges without the subscriber's consent. The broadcast signal includes portions addressable to particular receiver units. These portions include a designation of tiers to be blocked and a command to store same in the unit memory. Upon command to display a program on a selected tier, the memory is accessed and the stored designation compared with the selected tier. Receivers having stored designations corresponding to the selected tier are unable to display the program.

Abstract: A silicon substrate having a controlled oxygen content is sliced to form a wafer. The backside surface of the wafer is mechanically damaged for external gettering, polished, and subjected to heat for annealing to reduce strain and defects near the surface. The surface is then etched and the epitaxial layer formed by first growing an epitaxial layer, removing a substantial portion thereof, and then regrowing the layer to the required thickness. Immediately prior to device processing, an oxide layer is formed by heating the wafer, removing a portion of the epitaxial layer, and placing the wafer in an oxygen atmosphere. After a preselected time period in the oxygen atmosphere, the temperature is gradually reduced.

Abstract: The stack of sheets is urged towards a rotatable removal roller located at the top of the magazine. The roller is mounted on a frame which is pivoted relative to the magazine to provide access to the stack for reloading. Pivoting of the frame automatically actuates a spring-loaded rachet-type mechanism which prevents movement of the stack towards the open top end of the magazine, without interfering with the placement of additional sheets onto the stack.

Abstract: For use with a voltage controlled attenuator operating at microwave frequencies, the driver generates an output signal which is a non-linear function of an input voltage signal. The input stage includes a thermistor to alter the input signal to compensate for temperature variations. The temperature compensated signal is delinearized by parallelly connected diodes which separately selectively ground the output of the input stage at different potential levels defined by resistor networks. A differential amplifier generates a signal which is a function of the difference between the compensated input signal and the delinearized signal. The output stage generates an output voltage which is a function of the difference signal. The output voltage regulates a current source. The output of the current source is applied to the attenuating PIN diodes.

Abstract: The number of contact holes is reduced by fabricating the column select decode circuit as part of the array. The decode circuit includes four tiers of alternately arranged depletion mode and enhancement mode transistors, each tier receiving a different column address signal. The appropriate combination of signals connects a column of series connected driver transistors to the precharged control terminal of an isolation transistor. The output circuit of the isolation transistor is connected between the output line and ground. If all the driver transistors in the selected column are rendered conductive, the isolation transistor becomes non-conductive, permitting the output line to charge to a positive level.

Abstract: Hammer actuators are mounted on a support. Instead of moving the entire massive support to traverse the paper for each line, only a low inertia member, which positions the impact ends of the print wires, is moved. The internal structure of the member facilitates minor curvature of the print wires as the member moves. The member is rapidly reciprocated relative to the support, but "dwells" for a short time at each extreme to permit indexing of the paper. Ehnanced graphic capability is possible because each print wire can print a plurality of dots for each line.

Abstract: A reactor for use in a chemical vapor deposition process occurring in a radiant absorption heater system employs a vertical gas flow reaction vessel and a novel substantially solid susceptor configured as a truncated wedge. The susceptor is characterized by a high utilized area, resulting in a high wafer capacity and low power requirement.

Abstract: In response to a deceleration force, a rapidly reacting magnetic system causes a reed switch to change state. A predetermined time after the force ceases, a second, relatively slowly reacting magnetic system causes the switch to return to its original state. Each magnetic system includes a fixed magnet and a magnet movable within a recess. The reed switch is situated in a housing proximate the recesses and is controlled by the positions of the movable magnets. The recess through which the movable magnet of the slowly reacting system moves contains a fluid. This magnet carries a pair of self-positioning members which cooperate with the fluid to regulate the speed of the movement of the magnet within the recess, in accordance with its direction of movement, such that the slowly reacting system maintains the switch in the changed state and, thereafter, returns the switch to its original state.

Abstract: A susceptor for use in a chemical vapor deposition process in a radiant absorption heating system comprises a heater adapted to absorb radiant energy and a sheath of high purity quartz completely surrounding the heater. The sheath further comprises dimples inside the sheath spacing the sheath from the heater. The heater may be graphite having a substantially pinhole-free outgas-inhibiting outer-coating such as silicon carbide.

Abstract: Access time is reduced by isolating the relatively high impedance stack, formed of series connected driver transistors, from a relatively high capacitive output. The driver transistors are either enhancement mode or depletion mode transistors, depending upon the information to be represented thereby. An isolation transistor has its control terminal connected to the stack through a control node and its output circuit connected between the output node and ground. The output node is connected through a load to a positive voltage. A switched ground technique is used to charge the control node prior to addressing. During readout, if any of the series connected driver transistors in the selected stack are not rendered conductive, due to the level of the address signals applied thereto, the control node remains charged causing the isolation transistor to remain conductive and the output node is thus discharged. To increase density, multiple stacks are connected in parallel to a single isolation transistor.

Abstract: Spaced conductive strips are formed on a substrate. A first transmission line transformer is connected between the input and one end of the first strip. A second transmission line transformer is connected between the other end of the first strip and the output. The second strip is connected to ground. A shunt tuning circuit is connected between the strips. The circuit includes first and second MOS capacitors mounted on and connected to the grounded strip. An RF choke interconnects the other side of each capacitor. A varactor diode is mounted on and connected to the first capacitor. An etched spiral inductor connects the varactor and the first strip. A bias signal is applied to the junction between the choke and the second capacitor in order to tune the filter.