Abstract:
An electronic apparatus having a keyboard and an output device, such as a thermal printer unit. The apparatus, including its printer unit, is burn-in tested by an electronic system built into the apparatus. The system includes a memory, a circuit for storing a preselected or predetermined alphanumeric code in the memory and a circuit for repetitively causing the printer unit to print the contents of the memory. A delay system may be incorporated which causes the apparatus to enter a wait mode between printing operations. The period of time that the system is in the wait mode may be either a fixed duration or of a selected duration. In the embodiment disclosed, the apparatus is an electronic calculator.
Abstract:
A data processing system includes as part of its power circuits, a number of converter circuits, each coupled to a different one of the power supply units which are to provide different voltages for distribution and use throughout the system. Each of the power supply circuits furnish a 24 volt dc power confidence signal to a central ac power input entry panel which applies the power confidence signals to the converter circuits. Each converter circuit includes an optically coupled isolator circuit which converts the 24 volt dc signal to a noise free low voltage logic level suitable for utilization by the low level high speed logic circuits included within the system. The output noise free low voltages provided by the converter circuits are in turn applied to a corresponding number of confidence input lines of a system interface unit which includes a plurality of ports, each port connected to a different module within the data processing system. The states of the low voltage logical level signals are stored in a status register. When the operating system determines that a unit is inoperative due to a power supply unit failure, it can logically disconnect the port having a module having the failure. Additionally, one of the converter circuits provides a second output signal which is used to enable the clock circuits during system power up only after the system has been placed in a known state.
Abstract:
In a memory hierarchy system comprising a main memory for storing data and a buffer memory for holding a part of the data stored in the main memory as a copy of the main memory data, the data on the buffer memory is frequently replaced by the data on the main memory so as to hold in the buffer memory the data which is very frequently used. The buffer memory also holds the data which is in an area of the main memory where an irremediable fault occurred and that data is prevented from being replaced. Therefore, the buffer memory is substituted for the fault area of the main memory so that a fail soft system is attained.
Abstract:
A multiprogrammed multiprocessing information processing system having independently operating computing, input/output, and memory modules through an exchange, and interacting with a multilevel operating system designed to automatically makes optimum use of all system resources by controlling system resources and by scheduling jobs in the multiprogramming mix of the processing system. In operation, the operating system insures that all system resources are automatically allocated to meet the needs of the programs introduced into the system as well as insuring the continuous and automatic reassignment of resources, the initiation of new jobs, and the monitoring of their performance. System reliability is achieved by the incorporation of error detection circuit throughout the system, by single-bit correction of errors in memory, by recording errors for software analysis and by modularization and redundacy of critical elements.
Abstract:
A safety arrangement that avoids double access from paired duplicated circuits to commonly controlled equipment. The safety arrangement includes two safety circuits each associated with one of the duplicated circuits. Each of the safety circuits comprising a seizure bistable circuit whose output is connected to a priority arrangement. The output of the priority arrangement is connected to an operation bistable circuit. The priority arrangement is driven by one of two synchronized oscillators one in each safety circuit associated with duplicated circuit, the two oscillators operating in phase opposition.
Abstract:
This disclosure relates to a multiprocessing system having a plurality of different units such as processor, I/O units and so forth that can be arranged into individual processing groups, the functions of which units can be redesignated in order to maintain continuous operation of the system should a malfunction occur in any one or more of such units. Each processing group is provided with a redesignator unit to represent that group, which redesignator unit senses malfunctions in any of the units in the corresponding group or in other groups and controls the reconfiguration or redesignation cycle. The system further includes a reconfiguration control unit that includes a designation memory in which are stored different designation parameters for the functional designation of the different like units in the system. These various sets of redesignation or reconfiguration control signals are selected from the designation memory in response to condition sensed in the system by the various redesignator units.
Abstract:
A chip system that has reduced power consumption under specific operational modes includes: a DDR3 chip that includes: a plurality of pads, disposed at the center of the DDR3 chip; and an array of banks, each bank having a specific logical address, surrounding the pads. The chip system further includes: a clock, coupled to the DDR3 chip, for controlling a rate of data transmission; and a memory controller, coupled to the clock, for coordinating transmitted data with relevant processes, and for selectively reassigning the bank logical addresses according to a specific operational mode.
Abstract:
Upon detection of an overload condition at a network element, the network element sends two messages to those other network elements which may potentially send request messages to the overloaded network element. If the network utilizes the SIP signaling protocol, then the messages sent by an overloaded network element are SIP INVITE and SIP CANCEL. The CANCEL message comprises an indication that the sending network element is unavailable and an amount of time which the recipient network elements are to wait before sending any requests to the overloaded network node. Upon receipt of these messages, the receiving network elements wait for a delay time period before sending any additional request messages to the overloaded network element. During the waiting period, the waiting network elements may send request messages to network elements other than the overloaded network element which provide functionality similar to that of the overloaded network element.
Abstract:
A position measuring system for increasing operational dependability, wherein the absolute position is generated by scanning a chain code and erroneously scanned code words are detected and excluded from further processing. A plurality of codes are scanned at areas of the code track which are distanced from each other and are supplied to an error check device.
Abstract:
A data processing system operating in a bit oriented protocol (BOP) mode of operation senses a transmit underrun; that is, the subsystem is not receiving data from a microprocessor fast enough to maintain the synchronous transmission over the communication line. Apparatus senses the transmit underrun state and generates an abort sequence of bits containing from 8 to 13 successive binary ONE bits.