Programmable calculator to use magnetic strips were the HP-41C and TI-59. Continuous memory does not lose its content when the calculator is switched off. With continuous memory the user can, for example, change batteries without losing the entered programs. Compact Cassettes offered a simple, inexpensive alternative to magnetic cards. Usually, an interface module, such as the Casio FA-1, was used to connect the calculator to an ordinary cassette recorder and digital data were encoded as frequency-shift keyed audio signals. Sharp and Hewlett-Packard also sold dedicated micro- or mini-cassette recorders that connected directly to the calculator. These set-ups, while being more practical and
The Fantastic All-Electric Music Movie The Fantastic All-Electric Music Movie The Fantastic All-Electric Music Movie, also known as "John Wilson's Mini Musicals", is an anthology of short animated music videos which were originally created by John Wilson for "The Sonny and Cher Show" during the early to mid-1970s. The film was released on home video in 1981 by Video Gems under license from Fine Arts Films, an animation company founded by John Wilson in 1955. As well as the sixteen animated music videos from the show, the film includes an animated short based on Igor Stravinski's "Petrushka". Animator John Wilson produced animated music video shorts