A coordinate digitizer wherein a field generating device is positioned in proximity to the surface at a location to be digitized. Further means are provided for triggering the production of a magnetic field by the field generating device, the magnetic field transducing a propagating vibrational mode into the transmission media. Pick-up means are coupled to the transmission media and respond to the propagating vibrational mode for providing a signal to a utilizational device which will respond to...

Clocking apparatus for complex and extensive data processing systems in which the functional logic circuit units are each provided with individual clocking circuits and the several clocking circuits are activated by a central control unit. Operation of the individual clock circuits is initiated by control unit signals and each clock circuit operates at an independent rate. The clocking system is readily adaptable to computer systems using large scale integration (LSI) since the clock circuits ca...

Templates for simultaneously setting a number of toggle switches in a row such as during bootstrap loading of a computer. An elongated rectangular template having a series of teeth extending inwardly toward the computer panel is movable upward and downward with one end in slidable contact with a guide bar for positioning the template relative to the computer panel. Moving the template upward with the teeth under the handles sets a preselected group of switches to the IN position and, conversely,...

Herein is disclosed a circuit adapted for determining whether or not the number of corresponding bits in two parallel arrays of binary signals, which are of the same binary state, exceeds a preselected number. In accordance with one embodiment of the invention, a parallel array of cascode logic circuits is employed wherein each cascode circuit provides differential currents which are indicative of whether or not two applied bits, one from each signal array, are of the same binary state. Differen...

A microprogram read only store includes a section for storing substitute microinstruction words which are referenced selectively by microprograms included within the other part of the same store. Each microinstruction word of the store includes a sentinel bit which when set to a predetermined state causes logic circuits to inhibit execution of that microinstruction word and cause the store to address the upper section of the store. During a next cycle of operation, a branch is made to the locati...

Disclosed is an electronic calculator system implemented on at least one semiconductor chip having a first set of data storage memory registers for storing a first plurality of multi-digit, multi-bit data words, and further having another storage memory register coupled to the first set of storage registers for storing another multi-digit, multi-bit data word. The said another storage means has an input which is responsive only to one of the first set, under control of an instruction word provid...

Identification of coordinates of a region of a display device and the discharge state of that region is accomplished by means of a randomly positionable light detector and appropriate controls for selectively and non-destructively altering the discharge state of discharge sites in the device. A device offering spatial discharge transfer between discharge sites of individual cells such that if any site of a cell is in the "on state" of discharge the remaining sites of that cell will be transferre...

A writing pen for detecting time varying electrostatic field components and used in conjunction with a writing table which generates a unique electrostatic field is disclosed.

This invention relates to a system for detecting abnormal conditions in devices employing digital parallel-to-series converters. The system includes a digital storing device connected to the output of the converter which upon failure provides a constant logical level for a period longer than a certain threshold time.

In a data processing system including an associative store for rapid translation of recently used virtual page addresses to corresponding real page addresses to access main store, an additional storage means is provided to hold data representative of a boundary in main store below which translation is not required, i.e. the virtual address is used to access this lower part of main store. This lower part of main store is often referred to as the "nucleus"; and selected parts of the "operating sys...