Abstract: A selection circuit for a bipolar ECL memory having memory cell connected to cell selection lines and, more particularly, to upper and lower wordlines. The circuit includes a line driver connected to the upper wordline, an input stage for controlling the line driver to activate the upper wordline connected thereto in response to an address signal, and a switching device responsive to the input stage for applying a discharging current to the lower word line to speed up deactivation of the memory cell in response to a change in the address signal. In one embodiment, the line driver is also turned on at an increased rate for a limited time following application of the address signal to speed up the activation of the line.

Abstract: A liquid spill containment system inserted into an open airflow structure such that minimum interference with existing airflow occurs while simultaneously directing liquid spill particles into spill containers. A deflector is located below an upper partition portion of the open airflow structure. Spill containers are positioned below the deflector. The deflector and containers are located with respect to each other such that liquid particles coming through the open airflow structure are directed by the deflector into a container while, simultaneously, airflow entering the open air structure is exited unimpeded.

Abstract: In a multi-processor unit data processing system, apparatus and method are described for providing that only the most recent version of any data signal group will be available for manipulation by a requesting data processing unit. A "multiple" state for a data signal group is defined by the presence of a particular data signal group stored in the cache memory units of a plurality of data processing units. The "multiple" state is associated with each copy of a data signal group by control signals. When a data signal group is changed by the local data processing unit, an "altered" state is associated with the new data signal group. The simultaneous presence of an "altered" state and "multiple" state is forbidden and requires immediate response by the data processing system to insure consistency among the data signal groups. In addition to apparatus for identifying and storing the state of the data signal groups, apparatus must be provided for communication of the selected states to the data processing units.

Abstract: In a data processing system having a main memory containing addressable main memory storage locations, and also having a processor with a cache memory containing addressable cache memory storage locations, signals representative of predetermined addressable cache memory storage locations desired to be intentionally disabled by an operator of the data processing system are compared with signals representative of an addressable main memory storage location being addressed by the processor during the execution of a program instruction. The data processing system is then caused to access the addressable main memory storage location when the signals representative of the predetermined addressable cache memory storage locations are in a predetermined fixed relationship with the signals representative of the addressable main memory storage location being addressed by the processor during the execution of the program instruction.

Abstract: Signals are developed representative of the mechanical inertia of a vehicle simulator linkage elements that drive control members utilized by a student operator. These signals are combined with signals representative of programmed vehicle operating data and signals representative of the student operator's mechanical input such that the mechanical inertia of the simulator linkage elements does not influence the signal which causes the actual operator control member to have an appropriate force/"feel".

Abstract: Material to be manually fed into a machine's point of operation is supported by a surface plate. A pusher, interrelated with the surface plate by keying means, is held by the machine operator such that the operator uses the pusher to push the material into the machine point of operation without having the operator's hands coming in dangerous proximity with the machine point of operation or with the machine's structure.

Abstract: A simulated view on a viewing surface of a raster scan television display of a changeable illuminated area located on a plane surface is provided. The source of illumination is a cone of light whose apex can be located at any distance from an eyepoint and the plane surface and whose conical surface intersects the plane surface creating the illuminated area. Electronic components determine when a line of sight from the eyepoint through the viewing surface intersects the illuminated area. For each line of sight intersection point lying within the illuminated area, a corresponding illumination is created on the viewing surface.

Abstract: Over wide altitude ranges, signals representative of the altitude of an eyepoint viewing a synthetic grid pattern on a ground reference plane are scaled to provide strong signals. These strong signals are used to electronically define the intersection of a line of sight from the eyepoint to the grid pattern so that a clearly defined grid pattern as viewed over the wide altitude range can be displayed.

Abstract: Two video signals are precisely gain balanced so that one video signal may be inserted, unnoticeably, into a display derived from the first of the two video signals. To this end, a strobe is generated as the inset video signal is initiated. Both the inset video and the display video signals are sampled at the time said strobe is generated. A difference signal is derived from both samples and the gain of the inset video channel is adjusted in accord with the magnitude of that difference signal in a manner so as to minimize that magnitude.