Apparatus for resolving the priority of a plurality of input/output devices. The device request signals and signals indicating the channel number of the currently active channel program are applied to the address terminals of a programmable read only memory. Each address location stores bits indicative of the next priority device for the given input conditions.

A multi-level arbiter for resolving multiple requests for access to a shared facility. The arbiter includes a plurality of loop arbiters, each including a polling circuit to test each of a plurality of units for a request for access to the shared facility. The first unit encountered by the polling circuit on each loop which has a request for service active is conditioned to utilize the shared facility as soon as the central arbiter grants the request for service to the loop. The central arbiter ...

Vectored priority interrupt system utilizing a priority encoder which provides to the interrupted device, usually a processor, a coded signal denoting the highest priority device requesting an interrupt. The coded signals are transmitted to the interrupted device in response to a distinctive address signal provided by the interrupted device in response to an interrupt signal. Provision is also made to mask and to store the interrupt signals.

A hydraulic priority circuit for a fork lift truck or the like includes a variable output pump controlled by a motor. The speed of the motor is controlled by feedback from a demand indicator in a primary work system, such as a hydraulic steering system, and from a demand indicator in a secondary work system, including, for example, tilt and lift hydraulic circuits. A valve means, including a priority control valve, a sequence valve, and pressure compensated flow control orifices, is provided to ...

An automatic alternator for a priority circuit comprises one or more flip-flop circuits connected to the channels of the priority circuit by a plurality of AND gate means which are responsive to outputs of the flip-flop circuits and of the priority circuit channels to alternate the servicing of successive simultaneous signals at two or more requesting ports. The flip-flop circuit input is connected to the requesting ports through an AND gate and changes its operating state in response to the pre...

A priority interrupt circuit for inhibiting the supply of signals from a first audio signal source to an electroacoustic transducer and substituting therefore signals from a second audio signal source in response to the occurrence of signals from the second source and despite the continued availability of signals from the first source is disclosed having the further capability of effecting the substitution of the second source for the first source when a radio frequency transmitter is enabled.

A system displays messages one at a time to inform a vehicle operator of malfunctions or other events occurring in a vehicle with priority being given to the event of most importance whenever more than one event is sensed concurrently. A display device then selects messages for display and code switches are actuated to provide a unique electrical code signal for each message to indicate to the system which message is selected at a given moment. A number of sensors in the vehicle each respond to ...

A communication control unit in an electronic apparatus judges the priorities and the types of connected other electronic apparatus or apparatuses by communicating with the other electronic apparatus or apparatuses in response to the change in the connected state with the other electronic apparatus or apparatuses, and feeds to a speech recognition operation inhibition setting unit information as to whether or not the electronic apparatus itself has the highest priority. The speech recognition op...

In a priority assignment circuit receiving service request signals and comprising a plurality of service enable signal transmission units for transmitting a service enable signal in accordance with a priority determined by priority signals, bypass circuits are provided each for a predetermined number of service request units. Each bypass circuit is adapted to pass the service enable signal when respective service request signals are not coupled to them from service request units.

A priority switching circuit for providing a minimum voltage to a voltage sensitive load while charging a second load drawing a high current includes a battery, comparator, capacitor, and a voltage regulator. The output of the comparator causes the battery to be connected to the capacitor whenever the voltage across the capacitor drops below a predetermined minimum and causes the battery to be connected to the high current load when the voltage across the capacitor rises to a predetermined maxim...