| 摘要 |
<p>909,782. High-speed data store. NATIONAL CASH REGISTER CO. Dec.13, 1960 [Dec. 15, 1959], No. 35052/61. Divided out of 909,781. Class 106 (1). [Also in Group XL (c)] A constant current source 19 connectible to any selected drive line of a matrix 43 of bistable magnetic elements is connected also to a biased diode 26, 27 in such a manner that the diode is conductive when and only when no drive line of the matrix is selected. When the memory co-ordinate select circuits 44 are non- conductive the diodes 26, 27 are biased by -ve potential at terminal 28 and all the current from transistor 19 is absorbed by a dummy load 3. However, when any one of the co-ordinate select current is energized the collector bias voltage on 19 falls due to -ve marking on the remote end of the selected drive line so that diodes 26, 27 become non-conductive and all the current from 19 flows through the selected core drive line. A pair of thermistors 11, 12 adjacent the matrix vary the base potential of transistor 19 and therefore the current inversely with the temperature of the matrix.</p> |
