Abstract: The invention relates to a system for the reception, storage and subsequent ransmission of information. The system utilizes a main memory and an auxiliary memory. The information received by the auxiliary memory updates and corrects the information in the main memory. A timing generator controls the timing of the memory scan periods and a time normalizer is utilized to correct frequency deviations of the timing generator. A detector monitors the operation of the system.

Abstract: The proposed real time clock control of a computer system is implemented as programmer's working register in the central processing unit, instead of as an auxiliary subsystem in the input-output logic. Implemented in this manner, the real time clock is modifiable with memory reference instructions, to facilitate changes in the real time clock overflow interrupt interval and the storage of the real time clock value in a read-write memory.

Abstract: The proposed command controller responds to the true or desired command d pattern and its complement which are outputted from the computer interlaced in time and checks these true-complement patterns to determine if a command format error exists. Moreover, the command pattern is checked for timing errors by comparing it against preselected minimum and maximum delay intervals corresponding to the permissible minimum and maximum time intervals for a command signal output. If the command format or its timing is incorrect, an error flag is fed back to the computer to initiate an interrupt and/or to trigger a back-up mode. The invention facilitates the use of high speed general purpose computer machines as real time, hands off, control devices for certain applications such as onboard a spacecraft or within medical electronics systems, for example.