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B3-34
Elektronika B3-34 (Cyrillic: Электроника Б3-34) was a Soviet programmable calculator. It was released in 1980 and was sold for 85 rubles. B3-34 used reverse Polish notation and had 98 bytes of instruction memory, four stack user registers and 14 addressable registers. Each register could store up to 8 mantissa or Significand digits and two exponent digits in the range to . The first Soviet programmable stationary calculator the ISKRA 123, using mains power, was released at the beginning of the 1970s. The first programmable battery-powered pocket calculator Elektronika B3-21 was developed by the end of 1977 and released at the beginning of 1978. Its successor, B3-34, wasn't backward compatible with B3-21. The instruction set, hardware architecture and microcode of the B3-34 defined the standard of the later Soviet programmable hand-held and office-desk calculators: , , , . Model numbers do not follow any special order: MK-54 is a slightly upgraded version of B3-34 an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reverse Polish Notation
Reverse Polish notation (RPN), also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators ''follow'' their operands, in contrast to Polish notation (PN), in which operators ''precede'' their operands. It does not need any parentheses as long as each operator has a fixed number of operands. The description "Polish" refers to the nationality of logician Jan Łukasiewicz, who invented Polish notation in 1924. The first computer to use postfix notation, though it long remained essentially unknown outside of Germany, was Konrad Zuse's Z3 in 1941 as well as his Z4 in 1945. The reverse Polish scheme was again proposed in 1954 by Arthur Burks, Don Warren, and Jesse Wright and was independently reinvented by Friedrich L. Bauer and Edsger W. Dijkstra in the early 1960s to reduce computer memory access and use the stack to evaluate expressions. The algorithms and notation for this scheme were extended ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Seven-segment Display Character Representations
The topic of seven-segment display character representations revolves around the various shapes of numerical digits, letters, and punctuation devisable on seven-segment displays. Such representation of characters is not standardized by any relevant entity (e.g. ISO, IEEE or IEC). Unicode provides encoding codepoint for segmented digits in Unicode 13.0 in Symbols for Legacy Computing block. Digit Two basic conventions are in common use for some Arabic numerals: display segment ''A'' is optional for digit 6 (/), segment ''F'' for 7 (/), and segment ''D'' for 9 (/). Although ''EF'' () could also be used to represent digit 1, this seems to be rarely done if ever. ''CDEG'' () is occasionally encountered on older calculators to represent 0. In Unicode 13.0, 10 codepoints had been given for segmented digits 0–9 in the Symbols for Legacy Computing block: Alphabet In addition to the ten digits, seven-segment displays can be used to show most letters of the Latin, Cyrillic and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elektronika MK-18M
The Elektronika MK-18M (russian: Электро́ника МК-18М) was a scientific calculator manufactured in the Soviet Union. It was released in 1986. Technical specifications *Display: fluorescent, green color, contains 8 digits + minus sign + error sign *Power: 4 x AA batteries or AC adapter (with charging function) with 3-pin connector, power consumption ≤0.7W *20 buttons *Case: aluminium + plastic *Supported numbers range: ±(10E-7)...±(10E8-1) *Size: 170x86.5x27 mm, weighing around 350 grams *Ambient temperature range: +10...+35 °C See also *Elektronika B3-34 Elektronika B3-34 (Cyrillic: Электроника Б3-34) was a Soviet programmable calculator. It was released in 1980 and was sold for 85 rubles. B3-34 used reverse Polish notation and had 98 bytes of instruction memory, four stack user regist ... Computer-related introductions in 1986 Elektronika calculators {{Electronics-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elektronika B3-21
Elektronika B3-21 (Cyrillic: Электроника Б3-21) was the first Soviet programmable calculator. It was released in 1977 and was sold initially for 350 rubles (190 in 1980-81, and just 80 rubles at late 1981). For comparison, 120 rubles was a monthly engineer's salary.{{citation needed, date=November 2015 Production was stopped in 1982 because of introduction of more advanced Elektronika B3-34. Features * program memory - 60 steps in RAM (no ROM, the code is lost after shut down); * data memory - 2 operating registers, 7 additional directly addressed registers, 6 loop stack registers; * accuracy - 8 digits in the Significand(7 if the value includes decimal dot), 2 exponent digits; * operations - besides 4 arithmetic ones there were 1/x, x2, xy, sqrt(x), exp(x), ln(x), sin(x), cos(x); * conditional and unconditional branching, subroutine calls; * speed - 3-5 operations (program steps) per second on average (with xy taking the longest time of about 3 seconds); * display ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Synthetic Programming (HP-41)
Synthetic programming is an advanced technique for programming the HP-41C and Elektronika B3-34 calculators, involving creating instructions (or combinations of instructions and operands) that cannot be obtained using the standard capabilities of the calculator. Some HP-41C instructions are coded in memory using multiple byte The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable unit ...s. Some of these sequence of bytes correspond to instructions the calculator is able to execute, but these cannot be entered in the program memory using conventional program entry methods (''i.e.'' using the calculator as described in the user's manual.) Synthetic programming uses a bug in the calculator firmware to enter those byte sequences as a sequence of other instructions, then partially skipping halfway ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Programmable Calculator
Programmable calculators are calculators that can automatically carry out a sequence of operations under control of a stored computer programming, program. Most are Turing complete, and, as such, are theoretically general-purpose computers. However, their user interfaces and programming environments are specifically tailored to make performing small-scale numerical computations convenient, rather than general-purpose use. The first programmable calculators such as the IBM CPC used punched cards or other media for program storage. Hand-held electronic calculators store programs on magnetic strips, removable read-only memory cartridges, flash memory, or in battery-backed read/write memory. Since the early 1990s, most of these flexible handheld units belong to the class of graphing calculators. Before the mass-manufacture of inexpensive dot-matrix LCDs, however, programmable calculators usually featured a one-line numeric or alphanumeric display. The Big Four manufacturers of pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Soyuz TM-7
Soyuz TM-7 was a crewed Soyuz spaceflight to Mir.The mission report is available here: http://www.spacefacts.de/mission/english/soyuz-TM7.htm It launched on 26 November 1988, at 15:49:34, and was the start of the fourth long duration expedition to Mir, Mir EO-4. The crew would join the third crew member of EO-4, cosmonaut/physician Valeri Polyakov, who was on Mir for the second half of EO-3. Also launched by Soyuz TM-7 was French astronaut Jean-Loup Chrétien, who would take part in the 24-day French mission known as Mir Aragatz. The spacecraft Soyuz TM-7 remained docked to Mir for the duration of EO-4. At the end of EO-4 in April 1989, due to delays in the launch schedule, Mir was left uncrewed, and all three EO-4 crew members were transported back to Earth. Crew Backup crew *Aleksandr Viktorenko *Aleksandr Serebrov *Michel Tognini Mission parameters *Mass: 7,000 kg 15,400 lb *Perigee: 194 km (120 mi) *Apogee: 235 km (146 mi) *Inclination: 51.6 ° *Pe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calculator Spelling
Calculator spelling is an unintended characteristic of the seven-segments display traditionally used by calculators, in which, when read upside-down, the digits resemble letters of the Latin alphabet. Each digit may be mapped to one or more letters, creating a limited but functional subset of the alphabet, sometimes referred to as ''beghilos'' (or ''beghilosz''). Applications Aside from novelty and amusement, calculator spelling has limited utility. The popularity of pagers in the 1990s gave rise to a form of leetspeak called pagerspeak. Students, in particular, experimented with calculators to discover new words. English : The "original" attributed example of calculator spelling, which dates from the 1970s, is 5318008, which when turned over spells "BOOBIES". Another early example of calculator spelling offered the sequence 0.7734, which becomes "hello", or could also be written as “0.1134”. Other words possible with the traditional "BEghILOSZ" set include "LOOSE", "S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Novosibirsk
Novosibirsk (, also ; rus, Новосиби́рск, p=nəvəsʲɪˈbʲirsk, a=ru-Новосибирск.ogg) is the largest city and administrative centre of Novosibirsk Oblast and Siberian Federal District in Russia. As of the Russian Census (2021), 2021 Census, it had a population of 1,633,595, making it the most populous city in Siberia and the list of cities and towns in Russia by population, third-most populous city in Russia. The city is located in southwestern Siberia, on the banks of the Ob River. Novosibirsk was founded in 1893 on the Ob River crossing point of the future Trans-Siberian Railway, where the Novosibirsk Rail Bridge was constructed. Originally named Novonikolayevsk ("New Nicholas") in honor of Emperor Nicholas II, the city rapidly grew into a major transport, commercial, and industrial hub. Novosibirsk was ravaged by the Russian Civil War but recovered during the early Soviet Union, Soviet period and gained its present name, Novosibirsk ("New Siberia"), i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Microcode
In processor design, microcode (μcode) is a technique that interposes a layer of computer organization between the central processing unit (CPU) hardware and the programmer-visible instruction set architecture of a computer. Microcode is a layer of hardware-level instructions that implement higher-level machine code instructions or internal finite-state machine sequencing in many digital processing elements. Microcode is used in general-purpose central processing units, although in current desktop CPUs, it is only a fallback path for cases that the faster hardwired control unit cannot handle. Microcode typically resides in special high-speed memory and translates machine instructions, state machine data, or other input into sequences of detailed circuit-level operations. It separates the machine instructions from the underlying electronics so that instructions can be designed and altered more freely. It also facilitates the building of complex multi-step instructions, while red ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
