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
Hyderabad Electric Supply Company Hyderabad Electric Supply Company Hyderabad Electric Supply Company or HESCO is an electric distribution company which supplies electricity to all the districts of Sindh in Pakistan, excluding Karachi. Hyderabad had an Area Electricity Board (AEB) as one of the eight AEBs constituted through amendments in WAPDA Act during 1981. Later on as the Government of Pakistan approved the revamping of the Water and Power Development Authority (WAPDA) power sector in April 1998, the Hyderabad Electric Supply Company took over responsibilities of the Hyderabad Area Electricity Board. Hyderabad Electric Supply Company is owned and operated by WAPDA though. The company was