A universal adapter provides a standard interface to external equipment for testing and generally communicating with a data processing system. Linking main control elements of the system with diverse external test equipment, through a bit-serial binary communication terminal, the adapter provides a basis for establishing initial test conditions in the system while the latter is in a stopped or disabled condition. After initialization, the system is tested in its own dynamic environment at normal...

An interconnection system circuit integrated on the same substrate comprises: ohmic contacts made by a layer of zirconium or tantalum which ensures resistive contact and overlaid with a layer of aluminum. The interconnections are effected by two superimposed layers of zirconium or tantalum and of aluminium and the resistors are made by the exposed zirconium or tantalum.

Integrated circuits of high density are fabricated in a simplified process which allows both the use of multiple conducting layers in a dielectric above a semiconductor substrate, such as a polycrystalline silicon (polysilicon) field shield and metal interconnection lines, while also making provision for very precise alignment of subsequent layers to diffusions. A doped oxide containing a suitable dopant, such as arsenic in the case of a p-type silicon substrate, is deposited on the substrate. A...

An electronic control system adapted to control at least two mechanically coupled DC motors comprising control means whose input is connected to an AC source and whose output is connected for electrically controlling a semiconductive switching logic means and a motor speed logic means, a reference circuit means connected to said switching logic means and said motor speed logic means, said reference circuit means connected to a variable DC voltage generating means adapted to apply a variable DC v...

An integrated circuit having a combinational circuit and two field effect transistors formed on a common semiconductor substrate, and in which the two field effect transistors are made conductive alternately by two clock pulses without a direct current source.

A door operator for driving a track guided door through opening and closing cycles, including a rotating shaft and drive member movable therealong in response to rotation wherein the drive member is resiliently coupled to a door. A locking mechanism is provided for locking the door in closed position and an emergency device enables opening of the door when power is not available.

There is disclosed a method of manufacturing insulated-gate field effect transistor integrated circuits which includes the steps of diffusing an interconnection pattern into the surface of a semiconductor wafer prior to the formation of the insulated-gate field effect transistor devices. The insulated-gate field effect transistor devices are formed by utilizing the gate as a mask for the source and drain diffusion so that the device is self-aligned.

An integrated antenna system comprising a ground plane, at least one vertical element substantially perpendicular to the ground plane, a helically shaped element having horizontal polarization and a solid state circuit located at the junction of the horizontal and vertical elements. The described antenna system facilitates control of the characteristics of the antenna without varying the physical dimensions thereof. Consequently, antenna size may be reduced, related equipment simplified and the ...

A plurality of insulative strips having recessed contact-receiving grooves formed in opposite sides are mounted upon the upper face of an insulative mounting board parallel to one another to define spaced areas therebetween. A metal contact is mounted with a connector portion lying within each one of the contact-receiving grooves of the insulative strips and with the shank portion extending through to the underside of the insulative mounting board. The contact-receiving grooves are spaced from o...

Electrophotographic copying apparatus is disclosed having an elongated electrosensitive web defining a plurality of selectable image areas and movable along an endless path relative to a plurality of actuable work stations disposed along the path. Each work station is operative when actuated to perform a work operation on a selected image area of the web. The apparatus includes an electronic sequencer for sequentially actuating particular ones of the work stations to cause them to perform work o...