1. An associative read/write memory comprising first storage means which can be read from or written into said first storage means includinng a plurality of memory units of equal capacity, each containing an equal and pretermined number of levels, addressing means connected to the said first storage means for selecting the required memory location on the selected level, and associative means connected to the said first storage means, said associative means consisting of comparators equal in number to the number of levels in each memory unit multiplied by the number of memory units for performing a comparison between the content of a data descriptor at the input to the associative memory and the content of the information read from the memory on the selected level.