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
Sony Xperia Z1 Compact occurred during upgrading but after changing battery Android 5.0 and 5.1.1 are running any issues. Sony Xperia Z1 Compact The Sony Xperia Z1 Compact is an Android smartphone produced by Sony. The Z1 Compact has a 4.3 inch display and is released as a cheaper and smaller version of the flagship Xperia Z1 which features a 5-inch display. The Z1 Compact is the Sony smartphone to use an IPS panel, which improves markedly upon the poor viewing angles of the Xperia Z1 and its flagship predecessors like the Xperia Z and Xperia ZL. The Japanese version of the Z1 Compact,