Abstract: A position measurement system includes position error circuitry (PEC) that responds to periodically provided actual position information and a computed position to provide correction information, and a position synthesizer which responds to the correction information to provide the computed position. The computed position information is fed back to the PEC. The position synthesizer establishes a rate of change of the computed position based on the correction information in a manner tending to make the computed position track the actual position. The position synthesizer updates the computed position many times for each time that the actual position information is provided to the PEC, and thus provides much more continuous position information.

Abstract: A multiple microcomputer system in which each microcomputer can execute independent programs, transfer data at high speed to or from the memory of any microcomputer in the system, and signal between microcomputers that data has been transferred and the action to be taken on the transferred data.