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
Space Age Electronics Space Age Electronics Space Age Electronics (SAE) is a manufacturing company specializing in fire protection equipment and accessories, located in Sterling, Massachusetts. Founded in 1963, the company is known for its fire alarm notification appliances. In 1970, Space Age Electronics introduced the first visual notification appliances, the AV32 and the AV34 light plate. They used relabeled Federal Vibratone 450D's for their series of 2DCD horns, which were often used with the AV32 or 34.Other popular horns used would be Wheelock 34T-24's, Wheelock 34's or speakers. These would also be used with horns made by other companies, generally Wheelock, Federal Signal,