Interface
The Datasette has only one connection cable with a PCB edge connector at the computer end. All input/output signals to the datasette are all digital and so all digital to analog and vice versa is handled within the unit. Power is also included in this cable. The pinout is ground, +5 V DC, motor, read, write, key-sense. The sense signal monitors the play, rewind, and fast-forward buttons, but cannot differentiate between them. A mechanical interlock prevented any two of them being pressed at the same time. Unregulated 6.36 V DC is used to power the cassette motor.
Read more about this topic: Commodore Datasette