Abstract: A Computer system which includes a central processing unit, a central memory storage unit and a plurality of peripheral devices, the central processing unit having a control unit for dividing single complete input/output instructions for the transfer of data within the system into a sequence of discrete, separately executable, time independent operation instructions under the control of a microprogram. The system further includes peripheral device control units for the control of the independent execution of the discrete divided input/output (I/O) operation instructions. A microprogram command line is connected to the control unit in the central processing unit for controlling the output of the discrete I/O operation instructions along the system bus.

Abstract: An address conversion device for use with computer systems including a central processing unit and peripheral memory storage devices, such as discs, tapes and bubble memories, which serve for secondary data storage and in which binary data elements are stored in sequential addressable storage sectors. Such storage sectors have precise physical locations on the peripheral storage units. The address conversion device includes a first conversion unit which controls the conversion of user program addresses to logical addresses reflecting the logical structure of the data files stored in the peripheral storage units and a second conversion unit which converts the logical addresses to precise physical addresses of sectors of the secondary storage units in the form of electrical signals, such that the secondary storage units can be addressed as if they were random access units.