Abstract: The subject invention is a method for processing a plastic packaged electronic device with soldered leads. The solder has a critical temperature which if exceeded more than once results in its oxidation. The method comprises protecting the device with a carrier, and baking the device and carrier in a low pressure environment and at a temperature sufficiently high enough to drive off moisture previously absorbed by the plastic but lower than the critical temperature of the solder.

Abstract: A piggyback recorder for use in a printer terminal having a first recorder for printing a first set of data on a document, such as a receipt document. The piggyback recorder is detachably mounted piggyback onto the first recorder, thereby providing a second recorder to the terminal for printing a second set of data on the document. The piggyback recorder comprises a piggyback print member which is capable of printing the second set of data, a mounting member for mounting the piggyback print member directly onto a first print member of the first recorder, a piggyback platen, a second mounting member for mounting the piggyback platen directly onto a first platen of the piggyback recorder, and a solenoid for providing relative movement between the piggyback print member and the piggyback platen.

Abstract: A pin grid array package for carrying an integrated circuit chip having input/output leads. The pin grid array package includes a carrier having a centrally located opening for carrying the integrated circuit chip, a plurality of input/output pins spaced around the periphery of the centrally located opening, interconnect leads on the carrier for connecting selected ones of the input/output pins to selected leads of the integrated circuit chip, and heat sink material around the periphery of the input/output pins which serves as a cooling-fin for efficient integrated circuit chip heat removal. Each of the plurality of input/output pins is normal to the plane of the integrated circuit chip and extends through the carrier with a first portion extending away from a first side of the carrier and a second portion extending away from a second side of the carrier.

Abstract: A module for insulatively housing and refrigerating a semiconductor device which is designed to be plugged into a printed circuit board within a conventional air-cooled electronic system. The plug-in module is designed such that the semiconductor device within the module can be operated at temperatures from -200.degree. C. down to the temperatures of liquid helium, while a short distance below the housing portion of the module the plug-in conductors connect to a connector on a conventionally cooled processor board. This is accomplished without frost or other type of troublesome moisture forming on the plug-in conductors.

Abstract: A one piece jumper power cord molded out of rubber or some other insulating material. The one piece power cord conforms to the rear shape of a vertical stack of electronic devices that it interconnects. By keeping the power cords short and properly shaped, power can be jumpered from a lower device housed in a lower enclosure of the vertical stack to an upper device housed in an upper enclosure without a loose jumper cord dangling therebetween, wasting space and providing a possible hazard for passing objects or persons to catch on.

Abstract: An apparatus for controlling the transfer of data between a first remote processor constructed to process data words of a first length and a second remote processor constructed to process data words of a second length and which includes a storage member constructed to store data words of a third length. A DMA controller controls the transmission of data words between the storage member and the first remote processor. A first control processor controls the operation of a second processor and the DMA controller for transferring data from the second remote processor to the storage member. In response to instructions transmitted from the second remote processor, the first control processor will enable the second control processor to transfer data words of a third length to the storage member and will enable the DMA controller to transfer data words of the second length from the storage member to the second remote processor.

Abstract: For LSI/VLSI integrated circuits which inherently have an address decoder and a data bus, a scan testing method and apparatus is presented which does not require additional pin connections to be dedicated for scan test implementation. Counter to the Joint Test Action Group approach, the present invention uses additional registers, multiplexers, and decoders in conjunction with the existing buses to provide test access to otherwise embedded layers of logic circuitry, without the addition of a single pin connection to a integrated circuit chip package. Further, since this test method and apparatus uses the data bus and registers just as the rest of the chip, slow and complex d.c. level shifting equipment is not required.

Abstract: An encoder having a special construction which includes a special tension spring which increases the life of the encoder. The tension spring has first and second "U"-shaped portions formed on one end thereof with the remaining end of the spring being secured to a frame of the encoder. The first "U"-shaped portion of the spring is positioned around a stud on a beam of the encoder, and the second "U"-shaped portion receives a portion of the beam. An actuator is used to move a hammer on the beam to an impact position, and the tension spring is used to return the beam to a home position. As the beam is moved toward the impact position, there is an increase in the area of contact between the stud and the first "U"-shaped portion to thereby minimize movement therebetween. When the spring returns to the home position, the body portion of the spring assumes an "arched" position which minimizes "bounce" of the beam in returning to the home position.

Abstract: A magnetic read/write head is supported on the carriage that carries the platen of a passbook printer. The passbook is moved to the printing station and a sensor is provided for detecting the presence of the passbook. A height adjusting member operates to move the read/write head into position for writing data into and for reading data from a magnetic stripe on the passbook.

Abstract: A method is disclosed whereby individual members of a group of members or entities may be provided, under the control of a trusted member, referred to as the parent, with respective individual secret keys for use in public key cryptography, such that the matching public key can be readily derived, and group membership authenticated. The parent initially establishes a public key (e,N) where N=P.Q is the product of two primes. In response to a request from a group member, the parent selects two further primes R,S and communicates two values dependent thereon to the requesting member, which selects two more primes T and U for use in conjunction with the received values to establish the member's secret key.

Abstract: The subject invention is an interface circuit between a requesting device and a responding device. The circuit comprises a flip-flop responsive to a request signal received from the requesting device and a handshake signal received from the responding device to generate a control signal. The circuit also comprises a gate for receiving the control and handshake signals and generating an acknowledge signal. The removal of the request signal sets the control signal to a first value which disables the gate and removal of the handshake signal resets the control signal to a second value which enables the gate.

Abstract: A system and method are disclosed for optically communicating data between two data handling units where one of the data units supplies all of the optical power needed for the optical communications between the two data units. In a preferred embodiment a first data unit comprises a first data source, first and second optical sources of optical energy, and a first optical detector, while a second data unit comprises a second data source, a second optical detector and an optical modulator. In a first mode of operation, a first stream of digital data from the first data source pulse modulates the first optical source on and off causing the first optical source to transmit optical pulses to the second optical detector. These optical pulses are converted by the second optical detector back into a representation of the first stream of digital data for use by the second data unit.

Abstract: A business form of multiple ply construction includes one ply having adhesive thereon for attaching directly to a package being shipped. The one ply is a removable waybill copy portion of the business form which provides a recond of information or data concerning the shipping of the package in an arrangement which does not require a separate pouch on the package.

Abstract: A cash dispensing unit includes first (68) and second (70) cooperating endless groups of belts for feeding a stack (72) of currency notes to an exit location (50). First ends of the first (68) and second (70) groups of belts respectively pass round first (26) and second (30) group of pulleys of equal diameter mounted in a central position of a support framework (11), and second ends of the two groups of belts (68, 70) respectively pass round two smaller groups of pulleys (66, 52) disposed adjacent the exit location (50). The first group of belts (68) pass partly around the periphery of the second group of pulleys (30), and are resiliently stretchable so that the stack (72) can pass between this group of belts (68) and this group of pulleys (30).

Abstract: A portable optical bar code reader is adapted to be attached to the underside of the wrist of the user for reading coded labels on a purchased merchandise item. A ring member mounted on one of the fingers of the user has an actuating member mounted therein which is actuated by another finger of the user to enable the bar code reader to read a coded label. Scanning device mounted within the bar code reader provide a compact arrangement for generating a scanning light beam which scans the coded label. The bar code reader is attached to the wrist of the user by an easily removable strap member.

Abstract: An entity such as a smart card includes microprocessor means, input/output means, and PROM storage means which stores a set of transformations S.sub.i (i=1, . . . , n) of a corresponding set of public factors F.sub.1 (i=1, . . . , n), where S.sub.i =F.sub.i.sup.d (mod N), d being the secret key counterpart of a public key e associated with the modulus N, which is the product of two primes. An authentication device which stores the public factors F.sub.i and the values of N and e, generates an n bit random vector v=v.sub.i which is transmitted to the card where a product Y of the values S.sub.i selected according to the 1 bits of v is computed and transmitted to the authentication device which computes X.sub.act =Y.sup.e (mod N) and also computes X.sub.ref, the product of the F.sub.i selected according to the 1 bits of v. If X.sub.act and X.sub.ref are equal, then the card is authenticated to within a certain probability. An analogous method is disclosed for certifying messages to be transmitted.

Abstract: A hand-held bar code reader includes a source of scanning laser beams for scanning a coded label, a detector for detecting the light reflected from the coded label and a single piece composite optical lens structure. The lens structure has a first portion receiving the laser beams for reversing the direction of the laser beams. A second portion for focusing the laser beams on a rotating member which generates scanning beams for use in the scanning of the coded label and a third portion for collecting the light reflected from the coded label for focusing the reflected light on the detector.