Do you remember?
An early effort at creating a digital audio cassette format, the SV-P100 digital cassette recorder used Pulse Code Modulation to digitally encode audio and store it on a standard VHS cassette. According to the product literature, the videotape transport mechanism brought “the convenience normally associated with conventional front-loading cassette decks to a digital application.” The digital audio signal was recorded on the video track. Tape loading was automatic and an LED panel displayed the operating status.
Manufactured by Technics in 1982 when digital audio recording was fairly new, the company claimed that, with this machine, duplicate tapes were exactly the same as the original. Thus, every recording and every copy was a master copy.