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
SABA (electronics manufacturer) manufacturing of headphones, radio parts, and a variety of products from radio components to receivers. In 1931, SABA produced more than 100,000 units of the SABA Radio Type S-35. It introduced for the first time on the market dynamic loudspeakers which became soon a bestseller. The company developed the first radio receiver with search and automatic fine tuning in all bandwidths. In 1951 IFA, a consumer industry electronics show in Berlin allowed SABA to show the first TV receiver to the world. SABA successes enabled the company to manufacture tape recorders. It introduced the large TV screen projector 'Telerama' on