Abstract: For cassettes with memory for storing data relating to the cassette or the tape therein, memory error signal devices having two states representing that the cassette memory has an error or has no error, respectively, the memory error signal devices being operable between said states by a spindle member of a peripheral device. Two embodiments of memory error signal devices are disclosed, one embodiment having a capacitor, and circuit connections from said capacitor to terminals, the charged or discharged state of said capacitor constituting said two states of said device. The other embodiment has a signal plate mounted for movement between two positions, the two positions of said signal plate constituting the two states of the device, and the signal plate has terminals.

Abstract: Cassettes of recording tape are provided with an electronic memory including semi-conductor circuits mounted in the cassette housing for storing data relating to the cassette or tape therein. A memory error signal device is also provided in the cassette housing having states representing that data stored on the cassette memory has an error or no error. Devices for a tape deck apparatus for cooperation with the cassette memory circuits and error signal device are also disclosed.