Geschichteter Kapazitaets-Festwertspeicher

1,090,939. Capacitor read-only stores. INTERNATIONALE BUSINESS MACHINES CORPORATION. July 20, 1966 [Aug. 10, 1965], No. 32505/66. Heading G4A. In a capacitor read-only store, the various planes are bonded together to form a single laminated structure. As shown (Fig. 2), a capacitor read-only store comprises a drive plane consisting of a plurality of drive lines 26 on a dielectric base 28, an information plane consisting of a dielectric base 34 with selected areas 33 of a conductive material removed and a sense plane consisting of sense lines 38 (arranged orthogonally to the lines 26) on a dielectric base 42. Further information and sense planes are symmetrically provided on the other side of the drive lines 26, the pattern of holes 331 in the lower information plane being the mirror image of those in the upper plane. Ground planes 44, 46 are also provided together with a land plane 50 for making selective electrical connections. Between the various planes there are provided partially cured pre-impregnated epoxy-fibre gass laminating boards 54, 56, 58, 60, 62, 64 which, on further heating and application of pressure, bond the layers into a permanent laminated structure. The array shown may be bonded to a similar array 14. The external circuitry (Fig 8) includes a plurality of differential amplifiers 41 each connected to a pair of corresponding sense lines 38, 381. A plurality of such planes may be formed on a single card (Fig. 5, not shown) and input/output areas connected to pluggable connectors may be provided on a base card (Fig. 6, not shown).