A magnetic tape recorder is removably secured to an electronic digital information processing apparatus of the portable type for storing digital information and audio information. The digital information stored in the magnetic tape recorder is let out from the magnetic tape recorder in response to commands...http://www.google.fr/patents/US4536804?utm_source=gb-gplus-shareBrevet US4536804 - Data control system for storing digital and audio information on a magnetic tape
Data control system for storing digital and audio information on a magnetic tape
