In 1975 the Amdahl Corporation became the first … according to the configuration. Multilevel indirect addressing. Tested applied programming routines. In computing, a word is the natural unit of data used by a particular processor design.   On the 1620 II this instruction would NOT work (due to certain optimizations in the implementation). The 1621 Tape Reader and 1624 Tape Punch included controls for: The 1622's controls were divided into three groups: 3 punch control rocker switches, 6 buttons, and 2 reader control rocker switches. So that the required degree of precision could be specified, the mantissa could vary from 2 to 100 digits in length and the exponent field could range from -99 to + 99. The card reader made things easier because it had a special Load button to signify that the first card was to be read into the computer's memory (starting at address 00000) and executed (as opposed to just starting the card reader, which then awaits commands from the computer to read cards) – this is the "bootstrap" process that gets into the computer just enough code to read in the rest of the code (from the card reader, or disc, or...) that constitutes the loader that will read in and execute the desired program. Following transfer to San Jose, someone there jokingly suggested that the code name CADET actually stood for "Can't Add, Doesn't Even Try", referring to the use of addition tables in memory rather than dedicated addition circuitry (and SDTRL actually stood for "Sold Down The River Logic" became a common joke among the CEs). The 1620 was the first computer to offer an integrated plotter as a peripheral. It also stopped automatically when memory was cleared, instead of requiring the operator to stop it. IBM 1621 Paper Tape Reader accommodated both numerical and alphabetic information in single-character coding. The table below lists numeric mode characters. 16. Core memory cycle times were 20 microseconds for the (earlier) Model I, 10 microseconds for the Model II (about a thousand times slower than typical computer main memory in 2006). While the Lower console for both the Model 1[18] and the Model 2[19] IBM 1620 systems had the same lamps and switches, the Upper console of the pair were partly different. Reel-Strip switch – This switch selects whether Reels or Strips of paper tape are used. xxxxx is the address to load the tape into. Level H; improved Interrupt option that supported BT & BB subroutines in interrupt code. 60,000 decimal digits (basic memory plus IBM 1623 Storage Unit, Model 2). Announced by IBM on October 21, 1959, and marketed as an inexpensive "scientific computer". File No. Ans:- In USA. A 1620 was field-convertible to a 1710 Control System. 1710 interrupt feature. Ans:- Bit. One of IBM's last decimal machines (the internal format for numbers was BCD, with sign and parity bits), the 1620's nickname was CADET (Can't Add Doesn't Even Try) because addition was accomplished using lookup tables rather than adders (similarly for subraction and multiplication, and there was no DIVIDE instruction at all; division was done in software). After a total production of about two thousand machines, it was withdrawn on November 19, 1970. Stop reader – Pressing this key with the reader active, stopped the reader. One industry magazine mentioned that the 1620 was the first IBM … The FORTRAN II compiler and SPS assembler were somewhat cumbersome to use[27][28] by modern standards, however, with repetition, the procedure soon became automatic and you no longer thought about the details involved. What is ROM? Instead there was a button on the console called Modify which when pressed together with the Check Reset button, when the computer was in Manual mode, would set the computer in a mode that would clear all of memory in a tenth of one second regardless of how much memory you had; when you pressed Start. ", User:Br6cycles3, in his/first and only edit to date (24 Feb 2019, 18:15) attempted to change the name in the article from, "In 1962, IBM began delivery of a remarkable little machine originally called the Cadet but marketed as the IBM 1620.". Both Monitor systems required 20,000 digits or more of memory and one or more 1311 disk drives. However, at the last minute it was found that the muffin fan used to blow hot air through the core stack was malfunctioning, causing the core to pick up noise pulses and fail to read correctly. Large-capacity radial, nonstop stackers.     Model 1 contained an additional 20,000 positions. This unit (commonly called "1620" until the Model II was introduced) was produced as inexpensively as IBM could make it, in order to keep the price low. "Gate C" – Slides out back for access. "Gate D" – Slides out back for access. and its successor the IBM 1130.". There was a card writer (holes) and a large printer that printed on paper the output from the cards. Other IBM circuit types used were referred to as: Alloy (some logic, but mostly various non-logic functions, named for the kind of transistors used), CTRL (another type of RTL, but slower than SDTRL), CTDL (a type of diode–transistor logic (DTL)), and DL (another type of RTL, named for the kind of transistor used, "drift" transistors). It was pretty neat. IBM 1443 PRINTER for 1620/1710 Systems", IBM Systems Reference Library – 1620 FORTRAN (with FORMAT), IBM Systems Reference Library – IBM 1620 FORTRAN II Programming System Reference Manual, "The Man from U.N.C.L.E. Entries with "wordmark" trademark: …of eBay, Inc." Related words & phrases registered trademark service mark wordmark Translations trademark - identification of a company's product Arabic:…. After a total production of about 2,000 machines, it was withdrawn on 19-Nov-70. It was billed as a "small scientific computer" to distinguish it from the business-oriented IBM 1401. Pressing it toggles this enable and turns its light on/off. Special representatives in specific industries. What does BIOS Means? IBM 1620 Jr - Power of 2 demo program - Duration: 8:08. Examples: IBM 1401, ICL 2950 / 10, IBM 1620 etc. Share. Computer - Computer - History of computing: A computer might be described with deceptive simplicity as “an apparatus that performs routine calculations automatically.” Such a definition would owe its deceptiveness to a naive and narrow view of calculation as a strictly mathematical process. 18. Who is … IBM 1401: Its size was small to medium and used for business applications. Listen to the audio pronunciation of IBM 1620 on pronouncekiwi. According to IBM the 1620 could add or subtract 5-digit numbers 1,780 times per second. Each digit position individually addressable by a five-digit address. IBM Personal Computer The IBM Personal Computer, commonly known as the IBM PC, is the original version and progenitor of the IBM PC compatible hardware platform. Solid-state components. SPS would make use of variable lengths subroutines, as well as automatic floating point, on an optional basis. However, there was no need to use multiply in debugging code, so this was not considered to be a problem. Punched card, paper tape and keyboard input; card, paper tape and printed output. The IBM 1620 Model I was the original implementation of the IBM 1620 scientific computer, introduced in 1959.. IBM 1620 Facts . FORTRAN operated on a 20,000, 40,000 or 60,000 digit system. As a minor gaffe, IBM's own One-Pass Assembler was incompatible with this feature. IBM 1622 Card Read Punch Level C; introduction of 1622 card reader/punch. IBM's 1130, 1620, and 1800 systems were all popular at universities. with cards: the . Typical logic levels of all these circuits (S Level) were high: 0 V to -0.5 V, low: -6 V to -12 V. Transmission line logic levels of SDTRL circuits (C Level) were high: 1 V, low: -1 V. Relay circuits used either of two logic levels (T Level) high: 51 V to 46 V, low: 16 V to 0 V or (W Level) high: 24 V, low: 0 V. These circuits were constructed of individual discrete components mounted on single sided paper-epoxy printed circuit boards 2.5 by 4.5 inches (64 by 114 millimetres) with a 16-pin gold-plated edge connector, that IBM referred to as SMS cards (Standard Modular System). Sign in to disable ALL ads. IBM said the Mayflower operates at level-five autonomy — meaning it can work without any human intervention — thanks to … Begin execution. Later models of the typewriter had a special key marked R-S that combined the functions of the console Release & Start buttons (this would be considered equivalent to an Enter key on a modern keyboard). After a total production of about two thousand machines, it was withdrawn on November 19, 1970. The console typewriter was a modified Model B1, which typed at 10 Although there are descriptions of a single 100,000-digit machine, designed in the late 1960s, using heavily modified hardware. All of main memory could be cleared from the console by entering and executing a transfer instruction from address to address +1, this would overwrite any word mark, that would normally stop a transfer instruction, and wrap around at the end of memory. Used to format disk packs. This stuck and became very well known among the user community. A programming system which permitted users to write their programs in a language closely resembling that of mathematics. IBM 1620 console picture. However an optional special feature in hardware for octal input/output, logical operations, To simplify input and output, there were two instructions: The Model II used a modified Selectric typewriter, which could type at 15.5 cps – a 55% improvement. In fact, calculation underlies … IBM 1620 - A computer built by IBM and released in late 1959. Also Indirect Addressing. The IBM 1620 Model II (commonly called simply the Model II) was a vastly improved implementation, compared to the original Model I, of the IBM 1620 … Overflow check on addition, subtraction and compare. When a Branch Back instruction was executed in Save mode, it copied the saved value back to the program counter (instead of copying the return address register as it normally did) and deactivated Save mode. Start Stop button – Pressing this key starts or stops the disk drive motor. Programming was further simplified through the use of macroinstructions which generated linkages and incorporated subroutines into the object program. The IBM 1621 Paper Tape Reader could read a maximum of 150 characters per second;The IBM 1624 Paper Tape Punch could output a maximum of 15 characters/second.[1]. Automatic floating point operations. xxxxx is the address that you plan to set the breakpoint at. Non-Process Runout – This rocker with the read hopper empty, "ranout" remaining cards from the reader mechanism. Two-address instruction format, 12 digits. The times listed are based on a two-digit exponent and an eight-digit mantissa. The above was in the Model I. IBM's smallest computer at the time was the popular IBM 650, a fixed word length decimal machine that also used drum memory. Self-checking, six-bit, binary-coded decimal.Four-bit numerical value (1-2-4-8)Flag-bit for field and sign designation.Check-bit to give odd parity check. These boards were inserted into sockets mounted in door-like racks which IBM referred to as gates. Meaning of front panel. IBM 1620. Day, William Florac, and James Brenza. The computer could now punch cards. Odd-bit parity check on tape input-output. Accommodated both numerical and alphabetic information in single-character coding. IBM’s decision to enter the 1970s with a new line of computers, based on System/360, encouraged others to do the same. [31][32][33], An IBM 1620 model II was used by Vearl N. Huff, NASA Headquarters (FOB 10B, Washington DC) to program a three-dimensional simulation in Fortran of the tethered Gemini capsule – Agena rocket module two-body problem at a time when it was not completely understood if it was safe to tether two objects together in space due to possible elastic tether induced collisions. The IBM 1620 was a general-purpose, stored-program data processing system for small businesses, research and engineering departments of large companies, and schools requiring solutions to complex problems in the areas of engineering, research, and management science. Accommodated both numerical and alphabetic information in single-character coding. IBM 1624 Tape Punch Table-lookup arithmetic fully checked. Topic. Also the addition table would have to be reloaded for normal base 10 operation every time address calculations were required in the program, then reloaded again for the alternate base. To do fully signed addition and subtraction in bases 2 to 4 required detailed understanding of the hardware to create a "folded" addition table that would fake out the complementer and carry logic. 8:08. Vintage Dave 00:09, 1 July 2016 (UTC) Other peripherals. Over 200 branch offices to serve customer needs. 3. input was given by cards and the . The computer could now read cards. "Multi-level indirection could be used (you could even put the machine in an infinite indirect addressing loop), and in the middle three digits of 5-digit addresses (on the 1620 II) they were set to select one of seven index registers. In addition to the valid BCD digit values there were three special digit values (these could NOT be used in calculations): Instructions were fixed length (12 decimal digits), consisting of a 2-digit "op code", a 5-digit "P Address" (usually the destination address), and a 5-digit "Q Address" (usually the source address or the source immediate value). Replace the opcode of the instruction to "break" at with a Halt opcode. Made possible because much of logic was compacted using cards designed for the Model II. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only.     Model 2 contained an additional 40,000 positions. Level E; introduction of Floating Point option. Thus the operation would roll around memory (even overwriting itself) filling it with all zeroes until the operator grew tired of watching the roiling of the indicator lights and pressed the Instant Stop - Single Cycle Execute button. No disk access can be performed. There were subroutines for simple functions sin(x), cos(x), atan(x), exp(x), log(x), sqrt(x). Although IBM was a major player in personal computers, Lenovo acquired the IBM PC in 2004 and the x86 server line … IBM Power Systems Virtual Servers deliver AIX and IBM i with fast, self-service provisioning, flexible management for off-premises workloads, and access to our enterprise stack of IBM Cloud services--all in a pay-as-you-go billing model which enables them to scale up on IBM 's enterprise class systems to cater to their … It was concluded that IBM could offer nothing really new in that area. 02256̅ is the address of the location containing the address of the restart point of the Monitor program. Disclaimer. The general RN (read numeric) and WN (write numeric) instructions had assembly language mnemonics that supplied the "device" code in the second address field, and the control code in the low-order digit of the second address field. This was used during debugging to remember where the program had been stopped to allow it to be resumed after the debugging instructions that the operator had typed on the typewriter had finished. When it lights the drive is ready for access. ping pong: …Brothers.Registered in the United States in 1930, Ping-Pong (with dash) is still a registered wordmark of Parker … The computer operator could also stop a running program (or it may come to a deliberately programmed stop) then investigate or modify the contents of memory: being decimal-based, this was quite easy; even floating-point numbers could be read at a glance. computing A bit in each memory location on some variable-word-length computers (e.g. A radio program was developed by DJ Rege Cordic for KDKA Pittsburgh, based on a baseball game simulator developed by John Burgeson of IBM and his brother, Paul, then an ensign in the U.S. Navy. A comprehensive but simplified operator's console. Programs were prepared ahead of time, offline, on paper tape or punched cards. The compiler remained in memory, and the student's program had its chance in the remaining memory to succeed or fail, though a bad failure might disrupt the resident compiler. The entire core memory was in the IBM 1625 memory unit. 15. The standard "output" mechanism for a program was to punch cards, which was faster than using the typewriter. Control keys and switches for manual and semiautomatic control of computer operations. ", Saturated Drift Transistor Resistor Logic, "Some Key Dates in IBM's Operations in Europe, the Middle East and Africa (EMEA)", "The IBM 1620: Just The Right Machine for Chula's Statistics Department", "FORTRAN II – the First Computer Language Used at the University of Iceland", E.W. "Gate B" – Rear hinged gate that swings out the back for access. A similar arrangement was used in a late TV episode. The same computer was also used to simulate the orbits of the Gemini flights, producing printer-art charts of each orbit. View online or download Ibm 1620 Manual Of Instruction It could print 120 or 144 columns. Significance & Meaning Of Angel Number 1620. IBM created a one-of-a-kind experience on Jaffe Drive at Lincoln Center in New York and in select locations around the world. Automatic floating point feature available. They include normalizing and access to two floating point fields. There were a set of instructions that wrote to the typewriter, or read from it. Caps unveil Winter Classic throwback uniform. Mostly. IBM 1401, IBM 1620) used to mark the end of a word. In 1972 the Soviet Union and its Eastern European allies announced production had begun of their System/360-compatible series of computers. In addition, the printer had a buffer, so the I/O delay for the processor was reduced. we … Resume execution. The competing computers in this market were the Librascope LGP-30 and the Bendix G-15; both were drum memory machines. Multiplication used a 200 digit table (@ address 00100..00299). even five years later, it was still uncommon for a high school to have an IBM 1620: "The IBM 1620 (a.k.a. A rate of 56 per second.Logical decisions - 200 microseconds. Read 150 characters per second. (The 1130 line retained one 1620 peripheral, the IBM 1627 drum plotter.). > No. The IBM 1620 was announced by IBM on October 21, 1959,[1] and marketed as an inexpensive "scientific computer". Intel® Xeon® Processor E5-1620 (10M Cache, 3.60 GHz, 0.0 GT/s Intel® QPI) quick reference guide including specifications, features, pricing, compatibility, design documentation, ordering codes, spec codes and more. Optional automatic floating point operations IBM 1623 Storage Unit The machine had the following "gates" in its basic configuration: There were two different types of core memory used in the 1620: The address decoding logic of the Main memory also used two planes of 100 pulse transformer cores per module to generate the X-Y Line half-current pulses. Time included the fetching of two factors and was the complete interval elapsed from one instruction to the next. They completed the (codename) CADET prototype in the spring of 1959. It is IBM model number 5150, and was introduced on August 12, 1981. Most of the logic circuitry of the 1620 was a type of resistor–transistor logic (RTL) using "drift" transistors (a type of transistor invented by Herbert Kroemer in 1953) for their speed, that IBM referred to as Saturated Drift Transistor Resistor Logic (SDTRL). The balance of the Upper console was the same on both models: The Model I console typewriter was a modified Model B1, interfaced by a set of relays, and it typed at only 10 characters per second.[20]. Ibm 1620 Pdf User Manuals. This was effected by using the console facilities to load a simple computer program via typing its machine code at the console typewriter, running it, and stopping it. Expanded core storage to 40,000 or 60,000 positions. Division accomplished by available subroutine or by optional automatic divide feature. The IBM 1620 was first introduced in 1959, a second generation computer, it has transistorised circuitry. Console switch control permitted many input-output options in checking a program prior to compilation. Load – Pressing this key with the reader idle and on and the computer in. Dave Babcock 1,704 views. Transistor: Transistor is derived from the two words “transfer” and “register” and it is the device which is made of three terminal semiconductor materials that amplifies the electrical signal or opens or closes the electronic circuit. However this was not a crippling problem: Most 1620 installations used the more convenient punched card input/output,[10] rather than paper tape. And the console typewriter allowed entering data and getting output in an interactive fashion, instead of just getting the normal printed output from a blind batch run on a pre-packaged data set. Resolving The Problem. The table below lists Alphameric mode characters (and op codes). The machine had no programmer-accessible registers: all operations were memory to memory (including the index registers of the 1620 II). In September 1620, a wooden ship called the Mayflower set sail from Plymouth, England, with 102 people on board. The initial one, a initial home uniform, is a sleveless indication featuring which CHS wordmark which a Clarksville coaches love. Memory cycle time was halved compared to the Model I's (internal or 1623 memory unit), to 10, The processor clock speed was also doubled, to 2, Memory Address Register Display Selector – Rotary switch, 12 positions, Check Condition status lamps/switches – 15 lamps & 5 toggle switches, Console operator lights/switches – 13 lights, 1 power switch, and 12 buttons, Insert – Pressing this key with the computer in, Release – Pressing this key while doing a Read from the Typewriter terminated the Read, switched the computer into, Start – Pressing this key with the computer in, Stop-SIE – Pressing this key with the computer in, Instant Stop-SCE – Pressing this key with the computer in, Save – Pressing this key with the computer in, Display MAR – Pressing this key with the computer in, performed Self-checking to ensure accuracy. As far as I > can recall for the IBM-1620, the first of the 3-letter acronym was "S" > (probably standing for "Symbolic") and the second was "P" - my guess > is that the acronym was SPL for Symbolic Programming Language. IBM became a leader in computing hardware with the rise of early computers in the 1950s and 60s, but the shift to personal computers in the 1980s resulted in significant losses for the … 1620 consoles were used as props to represent Colossus in the film "The Forbin Project", though most of the machines had been scrapped by the time the film was made. What does front panel mean? IBM's hardware lines include its Z mainframes, midrange Power models and cloud-based Linux machines (see IBM Z, Power Systems and LinuxONE). My 1620 has the Special Instructions. Learn about THINK. 12 one-bit planes in each module, 1 to 3 modules, Memory Address Register Storage (MARS) memory, 16 Words, minimum of eight used in basic configuration, Single Word read, multiple Word clear/write, 24-bit, 5-digit decimal Memory Address (no 8 - Ten Thousand bit stored), No divide or floating point instructions, use subroutines in the "general program package", Wherever possible replace hardware with existing logical machine functions, No arithmetic circuits, use tables in core memory, No printer, use operator's console typewriter. The character width was fixed, so it was the paper size that changed; the printer printed 10 characters to the inch, so a printer could print a maximum of 12 inches or 14.4 inches of text. Aside from debugging, scientific programming is typically exploratory, by contrast to commercial data processing where the same work is repeated on a regular schedule. From the bitsavers.org collection, a scanned-in computer-related document.ibm :: 1620 :: general program library :: 1.6.103 1620 407 Flag Indicator Program Although the IBM 1620's architecture was very popular in the scientific and engineering community, computer scientist Edsger Dijkstra pointed out several flaws in its design in EWD37, "A review of the IBM 1620 data processing system". But for this instruction, no flag would ever be found because the source digits had shortly before been overwritten by digits lacking a flag. The IBM 1620 was announced by IBM on October 21, 1959, and marketed as an inexpensive "scientific computer". A rate of 5,000 per second.Data transmission of 5-digit fields - 360 microseconds. It also offers a variety of storage and networking products. [34], In 1964 at the Australian National University, Martin Ward used an IBM 1620 model I to calculate the order of the Janko group J1. Programming was in , one of the first versionsFortran . T he only 1620 in the country available for viewing is in a storage hangar at an IBM office complex outside Fishkill, New York. Ontdek de perfecte stockfoto's over Ibm 1620 en redactionele nieuwsbeelden van Getty Images Kies uit premium Ibm 1620 van de hoogste kwaliteit. 2. Stop punch – Pressing this key with the punch active, stopped the punch. [36], Many in the user community recall the 1620 being referred to as CADET, jokingly meaning "Can't Add, Doesn't Even Try", referring to the use of addition tables in memory rather than dedicated addition circuitry.[44]. IBM. Write Address button/light – This (Master only) key controls writing sector addresses. oo is the 2 digit opcode the original 12 digit instruction previously printed out. A collection of IBM 1620 related manuals in PDF format exists at bitsavers.[13]. Contains console, arithmetic and logical unit, and core storage. The IBM 1620 was a variable " word " length decimal ( BCD) computer with a magnetic-core memory that could hold: 20,000 decimal digits. Basic machine cycle was 21 microseconds. A computer for the "small scientific market", "... arranged as a 100x100 array of 12-bit locations, each holding 2 decimal digits. Visual display of machine check indicators, program registers and storage locations. 300 positions permanently assigned for use in arithmetic operations. The successor to the 1620, the IBM 1130,[11] was based on a totally different, 16-bit binary architecture. For instance, at Auckland University a batch job processor for student assignments (typically, many small programs not requiring much memory) chugged through a class lot rather faster than the later IBM 1130 did with its disk-based system. B) IBM 1620 Input Output Units Manual. movie's full of technological anachronisms", https://louisiana.edu/news-events/news/20090901/computer-science-hall-named-james-r-oliver, System Reference Manual for the IBM 1620 Central Processing Unit, Model 1, System Reference Manual for the IBM 1620 Central Processing Unit, Model 2, IBM 1620 Model II at the Thessaloniki Science Center & Technology Museum (archive link), https://en.wikipedia.org/w/index.php?title=IBM_1620&oldid=990661576, Articles with dead external links from July 2018, Articles with permanently dead external links, Creative Commons Attribution-ShareAlike License, BTAM Branch and Transmit Address Immediate. The complex is a sprawl of identical, brutalist buildings with labyrinths of corridors that lead to clean rooms and windowless offices and locked doors marked with biohazard signs. However, modern computers are not just a calculating device anymore. Fixed point operations Decimal and alphameric notation eased program writing and clarified report writing. High reliability with low maintenance. If you opened the back, you could actually see the little rings wound with wire. Simplified two-address instruction format. The Philippines Bureau of Lands uses an IBM 1620 system. A source program written in the FORTRAN language was processed by the 1620 FORTRAN compiler to produce a 1620 machine-language program. Automatic checking of card reading or punching. A rate of 200 per second.Division (5-digit quotient) with automatic divide feature - 16.86 milliseconds. IBM's Mayflower Autonomous Ship is scheduled ... following a course similar to the one traversed by the original Mayflower in 1620. [9] Among these are that the machine's Branch and Transmit instruction together with Branch Back allow a grand total of one level of nested subroutine call, forcing the programmer of any code with more than one level to decide where the use of this "feature" would be most effective. Ans:- IBM-1620 Series. Acronym Definition; 1620: Assault Person Assisting Police (police radio code; New Zealand) For program debugging there were the buttons labeled Save & Display MAR. Features: 1. Bootstrap definition: If you bootstrap an organization or an activity, you set it up or achieve it alone ,... | Meaning, pronunciation, translations and examples Meanwhile, the San Jose, California facility was working on a proposal of its own. When using this hardware feature, floating point numbers consisted of a variable length mantissa with a two digit exponent. 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Bronx Science, California facility was working on a proposal of its own typewriter used. There was a vastly improved version of the spare console switches to turn it off Pre-Compiler many. A new character ibm 1620 meaning ( called `` pillow '' ) as a peripheral ``. Select Lock light – this ( Master only ) key controls writing sector addresses eight-digit mantissa Processing! After a total production of about 2,000 machines, it was withdrawn on November 19, 1970 a calculating anymore. & Release, and Instant Stop-SCE team set the breakpoint at, could... And alphameric notation eased ibm 1620 meaning writing and clarified report writing - Power 2... A single 100,000-digit machine, designed in the implementation ) FORTRAN compiler to a... '' logic merged into `` Gate C '' – Rear hinged Gate that swings out the for! ( and op codes ) `` breakpoint '' download now our free translator to use, well... I used one of the world 's most influential computer - Duration 27:28... 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