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The Elektronika MK-52 ((ロシア語:Электро́ника МК-52)) is an RPN-programmable calculator which was manufactured in the Soviet Union during the years 1983 to 1992. The functionality of the MK-52 is identical to that of the MK-61, except the MK-52 has an internal non-volatile EEPROM memory module, for permanent data storage, diagnostic slot, and slot for ROM modules. Programming language and functionality of MK-52 and MK-61 are extensions of the MK-54, the B3-34 and B3-21 Elektronika calculators. It is the only known calculator to have internal storage in the form of an EEPROM module. All Soviet calculators are renowned for having a very large number of undocumented functions. The MK-52 has 105 steps of volatile program memory, an internal EEPROM module (with 512 bytes of memory) and 15 memory registers. It functions using either four AA-size battery cells or a wall plug. It has a relatively dim, ten-digit (8 digit mantissa, 2 digit exponent) green vacuum fluorescent display. The MK-52 has an expansion port to which various ROM (Read-only memory) modules may be attached. Its system clock speed is approximately 455 kHz (derived from a ceramic resonator), its weight is approximately 0.4 kilograms and its original selling price was 115 Roubles. The MK-52 was used as a backup to the onboard computers of the Soyuz spacecraft on the Soyuz TM-7 mission to the Mir space station. == Basic operations == Should it be required, one can refer to the (Russian to English translation of the MK-52's keyboard ). Note that throughout this page, square brackets represent actual keys, for example, () represents an 'addition' key. The MK-52 has two main operating modes; 'automatic mode' and 'programming mode'. General calculations and operations are performed in automatic mode; programs are input in programming mode. To switch between modes, one must press () () (looks like ()) to switch to automatic mode and one must press () () (looks like ()) to switch to programming mode. Basic operations in automatic mode are conducted in accordance with RPN (Reverse Polish Notation) logic. For example, to evaluate 2+3, the following keystrokes are required: () () (looks like ()) () (). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Elektronika MK-52」の詳細全文を読む スポンサード リンク
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