Abstract: A method for accessing and storing data in randomly assigned storage locations in a memory associated with a processor under the control of external circuits connected to the processor I/O bus, said external circuits being provided with registers for storing several assigned addresses in the memory which contain the starting addresses in the memory of a control list stored in a plurality of sequential addresses and five or more storage areas, each including a plurality of contiguous storage locations and further provision being made within the said processor for incrementing the addresses stored in the said assigned addresses each time they are accessed for performing a reading or writing operation in the memory location designated therein.