Commodore Business Machines, Inc.

David W DiOrio

Albert J Charpentier

James W Redfield

Robert J Raible

Bruce F Ahrens

Chaoynan E Yang

A comparator circuit incorporated into a video game device and operated responsive to first and second non-overlapping clock pulses can be used to compare background information location to SPRITE information location for both raster line (vertical) and column (horizontal) coordinates to provide a high speed interrupt signal to a central processor unit (CPU) triggering a processing of SPRITE or other features' display instead of a processing of background display, the comparator being implemented in less silicon area and having a lower power usage than other types of circuit implementations.

Raster line comparator circuit for video game

Programmable I/O (input/output) interface circuitry provides video and audio signals, needed for a video computer/game, to a commercial color television type display/monitor and may be implemented in HMOS, (H type metal oxide semiconductor) large-scale-integrated circuitry. The system architecture allows for reduced chip count, and improved reliability while providing adequate synchronization pulses, luminance level signals, chrominance phase shift signals, raster control and cursor control video and three independently controlled audio voices. A software selectable keyboard latch input, plural speed processing for faster operation when outside the active display area or during blanking, all system control signals necessary for system operation and 3 independently controlled interrupt generating timers are also provided.

Video sound and system control circuit

A solid-state, digital logic, sine-cosine generator is provided for use in color television signal generators which contributes little or no phase shift or drift, whereby an input frequency of four times the color burst rate is used, and a first divide by two shift register operates upon that input signal frequency while a second divide by two shift register is used to obtain the proper color burst frequency as well as the 90.degree. relationship for the sine and cosine signals; a series of integrators then converts the digital 'square' waves to triangular and then sinusoidal signals.

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Easton, PA, United States of America

David W DiOrio