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Искра-122-1 | ||||
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The Искра-122-1 (Iskra translates to "spark" in Russian) is a basic four-function calculator manufactured between 1979 and 1983 by the Schetmash factory in Kursk, USSR. The Iskra 122-1 was a modification of the Iskra-122 and a further development of the Iskra-111M. It features the four basic arithmetic functions plus a percentage function, square, square root, and five-level parentheses. It has five registers and a fixed decimal point, which is selected by pressing radio buttons on the keyboard (it can be fixed at 3, 5, 7, 9, 11, or 13 digits). The calculator can operate with or without rounding calculation results, controlled by a red radio button. The internal components are housed in an all-plastic casing, making the machine considerably lighter than older Iskra series calculators that featured metal cases. The display consists of 17 Vacuum Fluorescent Display (VFD) tube indicators (ИВ-6): 16 for digits and one for the negative sign and error symbols. The processing logic of the Iskra-122-1 is based on small-scale integrated circuits (SSI). It contains approximately 100 separate chips (K172, K144, and K501 series) across seven circuit boards, plus additional discrete components on the main board. The chips, from various Soviet manufacturers, are dated between 1980 and 1982. This specific calculator was a valuable asset at the Oil Shale Research Institute (Põlevkivi Teadusliku Uurimise Instituut) in the city of Kohtla-Järve in former Soviet Estonia. Weight 8kg Dimensions: 38 x 34 x 13 cm. | ||||
| Year of manufacture: 1980 | ||||
| Serial №: 028175 | ||||
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