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 Lancashire Electric Power Company The Lancashire Electric Power Company The Lancashire Electric Power Company was one of the largest private electricity companies in the UK. It was established by Act of Parliament in 1900. Its original power station was the Radcliffe Power Station which was opened by the Earl of Derby on 9 October 1905. This had two 1,500 kW turbo sets manufactured by British Thomson-Houston, generated at 10 kV (the first power station in the UK to transmit by bare electric conductors at 10kV). The first customer was the Acme Spinning Company in Pendlebury which with 75,000 spindles was the first cotton spinning