| 摘要 |
1,055,261. Read-only stores. INTERNATIONAL BUSINESS MACHINES CORPORATION. July 4, 1963 [July 10, 1962]. No. 26504/62. Heading G4A. In read-only memories in which a capacitive or other connection is made between selected drive and sense lines from sets of such lines the invention provides that there is a constant impedance to current in the drive line whatever the form of the stored data. This is done in Fig. 2 (not shown) by providing pairs of sense lines both lines of a pair being connected to a differential amplifier. One bits are stored by connecting the lines S1a, S2a to appropriate drive lines, and zero bits by connecting the lines S1b, S2b to the drive lines. Fig. 3 (not shown) shows pairs of drive and sense lines. Ones are stored by connecting the d drive lines to the p sense lines and the b drive lines to the q sense lines and zeroes by making the opposite connections. To pulse a drive line a transistor from the set G1 to GN is sent conductive after which a transistor T1 or T2 . . . is pulsed. The invention is also applicable to inductive readonly stores. |
