Abstract: Each memory cell in an EPROM includes two memory cell transistors which share a common floating gate and have two separated drains, one of which is connected to a read bit line and the other of which is connected to write bit line. In this EPROM, the read memory cell transistor of the read bit line has a lower hot electron injection rate than the hot electron injection rate of the write memory cell transistor of the write bit line. A bit line voltage booster is connected to the read bit line.

Abstract: A floppy disc recording and/or reproducing apparatus comprises a loading mechanism which has a support member which is fixed to the frame and has cam levers pivotally supported thereon, where each of the cam levers have a second cam part, a cartridge holder which has a first cam part and is arranged movable in upward and downward directions of the apparatus under guidance of the support member, and a push-eject member which has third and fourth cam parts and an ejecting push-button. The push-eject member is movable in frontward and rearward directions of the apparatus under guidance of the frame or the support member. A sequence of operations are carried out when a cartridge which accommodates the floppy disc is placed onto the cartridge holder so as to load the cartridge with respect to a driving shaft.

Abstract: A movable support for indexing a recording head across the face of a recording tape in a deck in precision steps free of backlash and angular movement out of the normal plane of the tape and in which a pair of parallel, matched leaf springs carrying the recording head by their outer ends are anchored at their inner ends to a block adjustably secured to the frame of the tape deck such that the effective length of at least one of the leaf springs can be changed.

Abstract: An apparatus for driving a flexible magnetic disk comprises an upper member and a lower member for positioning a flexible magnetic disk sheet of the flexible magnetic disk by engagement with a circular hole at the center of the magnetic disk sheet. A lubricating material is applied onto the surfaces of the upper members and the lower members, thereby to decrease the coefficient of friction of the upper member with respect to the magnetic disk sheet to a value within the range of 0.45 or less, and that of the lower member to a value within the range of 0.30 or less.