Issue No. 04 - April (1976 vol. 9)
S.L. Rege , Burroughs Corporation
Until recently, electronically addressable devices such as ferrite core, plated wire, semiconductor memories, and electromechanically addressable devices such as magnetic tapes, disks, and drums were the few technologies from which a computer system designer could build a memory system. A number of different new technologies and devices have been developed that close the "access gap"<sup>14</sup>between the two dissimilar technologies mentioned above. These include charge-coupled devices (CCD's),<sup>2</sup>bubble memories,<sup>4</sup>electron beam addressed memories (EBAM),<sup>17</sup>and domain tip propagation (DOT).<sup>16</sup>Other technologies like CMOS<sup>1</sup>and integrated injection logic (I<sup>2</sup>L),<sup>9</sup>compete directly with the existing technologies. Table 1 (see p. 46) shows the possibility of a six-level hierarchy and some cost and performance projections for these technologies.
S. Rege, "Cost, Performance, and Size Tradeoffs for Different Levels in a Memory Hierarchy*," in Computer, vol. 9, no. , pp. 43-51, 1976.