Abstract: The disclosure describes an interface including data lines and address lines which address a memory. Control lines control the exchanges of data among the data lines, address lines, memory and data processing unit. A parity line provides a means of checking the accuracy of the information transmitted on the data or address lines.

Abstract: The invention relates to the recording and use of microprogrammes which may be stored either in a fixed control store or the central store of a processer.Microinstructions of the same format, which may be stored either in the static store or the central store, are carried out in the same way with no excess cycles.

Abstract: The disclosure describes improved techniques for using a general or parametered microinstruction for more than one application. A read/write store provides at a first address a storage location for the parametered microinstruction. The parametered microinstruction is calculated according to data values stored in a table in order to accommodate the various applications. In one embodiment, an arithmetic and logic unit combines first and second values from the table in order to form or calculate a microinstruction having first and second parameters. The calculated microinstruction then is stored in the read/write store at the first address. This techniques enables the calculated microinstruction to be carried out in the same manner as non-parametered microinstructions.