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Pentium FDIV Bug
The Pentium FDIV bug is a hardware bug affecting the floating-point unit (FPU) of the early Intel Pentium processors. Because of the bug, the processor would return incorrect binary floating point results when dividing certain pairs of high-precision numbers. The bug was discovered in 1994 by Thomas R. Nicely, a professor of mathematics at Lynchburg College. Missing values in a lookup table used by the FPU's floating-point division algorithm led to calculations acquiring small errors. In certain circumstances the errors can occur frequently and lead to significant deviations. The severity of the FDIV bug is debated. Though rarely encountered by most users (''Byte'' magazine estimated that 1 in 9 billion floating point divides with random parameters would produce inaccurate results), both the flaw and Intel's initial handling of the matter were heavily criticized by the tech community. In December 1994, Intel recalled the defective processors in what was the first full r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
KL Intel Pentium A80501
KL, kL, kl, or kl. may refer to: Businesses and organizations * KLM, a Dutch airline (IATA airline designator KL) * Koninklijke Landmacht, the Royal Netherlands Army * Kvenna Listin ("Women's List"), a political party in Iceland * KL FM, a Malay language radio station Places * Kaiserslautern, Germany (license plate code KL) * Kerala, India (ISO 3166-2:IN sub-code KL) * Kirkland Lake, Ontario, Canada * Kowloon, Hong Kong * Kuala Lumpur, Malaysia Science, technology, and mathematics * KL engine, version of the Mazda K engine * Klepton (kl.), a type of species in zoology * Kiloliter (kL), a unit of volume * Kullback–Leibler divergence in mathematics * KL (gene), a gene which encodes the klotho enzyme in humans Other uses * Jeep Cherokee (KL) * Kalaallisut language (ISO 639 alpha-2 language code "kl") * Kl (digraph), used in the Zulu language to write /kʟ̥ʼ/ or /kxʼ/ * Konzentrationslager, or concentration camp, abbreviated KZ or KL * '' KL: A History of the Nazi Concentrat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Twin Prime
A twin prime is a prime number that is either 2 less or 2 more than another prime number—for example, either member of the twin prime pair or In other words, a twin prime is a prime that has a prime gap of two. Sometimes the term ''twin prime'' is used for a pair of twin primes; an alternative name for this is prime twin or prime pair. Twin primes become increasingly rare as one examines larger ranges, in keeping with the general tendency of gaps between adjacent primes to become larger as the numbers themselves get larger. However, it is unknown whether there are infinitely many twin primes (the so-called twin prime conjecture) or if there is a largest pair. The breakthrough work of Yitang Zhang in 2013, as well as work by James Maynard, Terence Tao and others, has made substantial progress towards proving that there are infinitely many twin primes, but at present this remains unsolved. Properties Usually the pair is not considered to be a pair of twin primes. Since 2 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Science (journal)
''Science'' is the peer review, peer-reviewed academic journal of the American Association for the Advancement of Science (AAAS) and one of the world's top academic journals. It was first published in 1880, is currently circulated weekly and has a subscriber base of around 130,000. Because institutional subscriptions and online access serve a larger audience, its estimated readership is over 400,000 people. ''Science'' is based in Washington, D.C., United States, with a second office in Cambridge, UK. Contents The major focus of the journal is publishing important original scientific research and research reviews, but ''Science'' also publishes science-related news, opinions on science policy and other matters of interest to scientists and others who are concerned with the wide implications of science and technology. Unlike most scientific journals, which focus on a specific field, ''Science'' and its rival ''Nature (journal), Nature'' cover the full range of List of academ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
PowerPC
PowerPC (with the backronym Performance Optimization With Enhanced RISC – Performance Computing, sometimes abbreviated as PPC) is a reduced instruction set computer (RISC) instruction set architecture (ISA) created by the 1991 Apple Inc., Apple–IBM–Motorola alliance, known as AIM alliance, AIM. PowerPC, as an evolving instruction set, has been named Power ISA since 2006, while the old name lives on as a trademark for some implementations of Power Architecture–based processors. Originally intended for personal computers, the architecture is well known for being used by Apple's desktop and laptop lines from 1994 until 2006, and in several videogame consoles including Microsoft's Xbox 360, Sony's PlayStation 3, and Nintendo's GameCube, Wii, and Wii U. PowerPC was also used for the Curiosity (rover), Curiosity and Perseverance (rover), Perseverance rovers on Mars and a variety of satellites. It has since become a niche architecture for personal computers, particularly with A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Michael Abrash
Michael Abrash is an American programmer and technical writer. He has written dozens of magazine articles and multiple books on code optimization and software-rendered graphics for IBM PC compatibles. He worked at id Software in the mid-1990s on the rendering technology for '' Quake''. He later wrote the Pixomatic software renderer for RAD Game Tools. Since 2014, he has been the chief scientist of Oculus VR, a subsidiary of Meta Platforms. Abrash started his career in 1982 writing action video games for the IBM PC, which eventually resulted in a 1990 book, ''Zen of Assembly Language Volume 1: Knowledge'', about optimization for the 16-bit 8086 and 8088 processors. He began writing about programming the EGA and VGA hardware of IBM PC compatibles for ''Programmer's Journal'' in the late 1980s, followed by a column for '' Dr. Dobb's Journal'' in the early 1990s. In the latter, he introduced a method of adjusting VGA mode 13h to have a resolution of 320×240 with square pixels, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Romero
Alfonso John Romero (born October 28, 1967) is an American video game developer. He co-founded id Software and designed their early games, including ''Wolfenstein 3D'' (1992), ''Doom (1993 video game), Doom'' (1993), ''Doom II'' (1994), ''Hexen: Beyond Heretic, Hexen'' (1995) and ''Quake (video game), Quake'' (1996). His designs and development tools, along with programming techniques developed by the id programmer John Carmack, popularized the first-person shooter (FPS) genre. Romero is also credited with coining the multiplayer term "Deathmatch (video games), deathmatch". Following disputes with Carmack, Romero was fired from id in 1996. He co-founded a new studio, Ion Storm, and directed the FPS ''Daikatana'' (2000), which was a critical and commercial failure. Romero departed Ion Storm in 2001. In July 2001, he and another former id employee, Tom Hall, founded Monkeystone Games to develop games for mobile devices. In 2003, Romero joined Midway Games as the project lead on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quake (video Game)
''Quake'' is a 1996 first-person shooter game developed by id Software and published by GT Interactive. The first game in the ''Quake'' series, it was originally released for MS-DOS and Microsoft Windows, followed by Mac OS, Linux and Sega Saturn in 1997 and Nintendo 64 in 1998. The game's plot is centered around teleportation experiments, dubbed slipgates, which have resulted in an unforeseen invasion of Earth by a hostile force codenamed Quake, which commands a vast army of monsters. The player takes the role of a soldier (later dubbed Ranger), whose mission is to travel through the slipgates in order to find and destroy the source of the invasion. The game is split between futuristic military bases and medieval, gothic environments, featuring both science fiction and fantasy weaponry and enemies as the player battles possessed soldiers and demonic beasts such as ogres or armor-clad knights. ''Quake'' heavily takes inspiration from gothic fiction and in particular the wor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electronic Engineering Times
''EE Times'' (''Electronic Engineering Times'') is an electronics industry magazine published in the United States since 1972. EE Times is currently owned by AspenCore, a division of Arrow Electronics since August 2016. Ownership and status ''EE Times'' was launched in 1972 by Gerard G. Leeds of CMP Publications Inc. In 1999, the Leeds family sold CMP to United Business Media for $900 million. After 2000, ''EE Times'' moved more into web publishing. The shift in advertising from print to online began to accelerate in 2007, and the periodical shed staff to adjust to the downturn in revenue. In July 2013, the digital edition migrated to UBM TechWeb's DeusM community platform. On June 3, 2016, UBM announced that ''EE Times'', along with the rest of its electronics media portfolio ( EDN, Embedded.com, TechOnline, and Datasheets.com), was being sold to AspenCore Media, a company owned by Arrow Electronics, for $23.5 million. The acquisition was completed on August 1, 2016. Av ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
X86 Instruction Listings
The x86 instruction set refers to the set of instructions that x86-compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. The x86 instruction set has been extended several times, introducing wider registers and datatypes as well as new functionality. x86 integer instructions Below is the full 8086/8088 instruction set of Intel (81 instructions total). These instructions are also available in 32-bit mode, in which they operate on 32-bit registers (eax, ebx, etc.) and values instead of their 16-bit (ax, bx, etc.) counterparts. The updated instruction set is grouped according to architecture ( i186, i286, i386, i486, i586/i686) and is referred to as (32-bit) x86 and (64-bit) x86-64 (also known as AMD64). Original 8086/8088 instructions This is the original instruction set. In the 'Notes' column, ''r'' means ''register'', ''m'' means ''memory address'' and ''imm'' means '' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Internet
The Internet (or internet) is the Global network, global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) to communicate between networks and devices. It is a internetworking, network of networks that consists of Private network, private, public, academic, business, and government networks of local to global scope, linked by a broad array of electronic, Wireless network, wireless, and optical networking technologies. The Internet carries a vast range of information resources and services, such as the interlinked hypertext documents and Web application, applications of the World Wide Web (WWW), email, electronic mail, internet telephony, streaming media and file sharing. The origins of the Internet date back to research that enabled the time-sharing of computer resources, the development of packet switching in the 1960s and the design of computer networks for data communication. The set of rules (communication protocols) to enable i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pentium Compatible Processor
The Pentium (also referred to as the i586 or P5 Pentium) is a microprocessor introduced by Intel on March 22, 1993. It is the first CPU using the Pentium brand. Considered the fifth generation in the x86 (8086) compatible line of processors, succeeding the i486, its implementation and microarchitecture was internally called ''P5''. Like the Intel i486, the Pentium is instruction set compatible with the 32-bit i386. It uses a very similar microarchitecture to the i486, but was extended enough to implement a dual integer pipeline design, as well as a more advanced floating-point unit (FPU) that was noted to be ten times faster than its predecessor. The Pentium was succeeded by the Pentium Pro in November 1995. In October 1996, the Pentium MMX was introduced, complementing the same basic microarchitecture of the original Pentium with the MMX instruction set, larger caches, and some other enhancements. Intel discontinued the P5 Pentium processors (sold as a cheaper product sinc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Intel 80486DX4
IntelDX4 is a clock-tripled i486 microprocessor with 16 KB level 1 cache.http://www.pld.ttu.ee/~prj/486dev.pdf Intel named it DX4 (rather than ''DX3'') as a consequence of litigation with Advanced Micro Devices over trademarks. The product was officially named IntelDX4, but OEMs continued using the i486 naming convention. Intel produced IntelDX4s with two clock speed steppings: A 75-MHz version (3× 25 MHz multiplier), and a 100-MHz version (3× 33.3 MHz or 2x 50 MHz). Both chips were released in March 1994. A version of IntelDX4 featuring write-back cache was released in October 1994. The original write-through versions of the chip are marked with a laser-embossed “&E,” while the write-back-enabled versions are marked “&EW.” i486 OverDrive editions of IntelDX4 had locked multipliers, and therefore can only run at 3× the external clock speed. The 100-MHz model of the processor had an iCOMP rating of 435, while the 75-MHz processor had a rat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
