Abstract: A linear motor for driving a dot printer head includes a carriage carrying print head. The carriage is displaced by a drive system on a linear guide rail. The drive system is a linear motor having an armature wound on a support situated on the carriage. The motor includes an armature winding in a magnetic circuit including the rail.

Abstract: The location of a dot printer print head driven by a linear motor on a mole carriage is detected with a system including an ultrasonic acoustic transmitter on a carriage for the head and a receiver on a frame of the printer.

Abstract: This invention relates to a channel for exchanging information between a computer and rapid peripheral units. Each rapid peripheral unit as well as the bus line of the computer have a direct access to at least one buffer storage, consisting of a stack of sequentially addressable registers. The information to be exchanged between the computer and the peripheral unit are recorded temporarily in the buffer storage, in the stacking order of its registers. Then the previously recorded information is extracted from the buffer storage in the reverse sequential order. This substantially relieves the computer of the processing of inputs and outputs of the peripheral unit. Such a channel is adapted for interconnecting computers and peripheral units operating at considerably different speeds.

Abstract: This invention relates to a data processing system, specially for real-time applications. This system comprises a processor having a relatively small number of registers, and safeguard storages consisting each of a stack of sequentially addressable registers. When a program being performed is interrupted, all the information contents of the processor registers are transferred to at least one safeguard storage. The transferred information are subsequently extracted, upon resumption of the interrupted program, from the safeguard storage, in a sequential order reverse with respect to the order in which they had been previously transferred. This system is specially adapted for controlling industrial processes.