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Eventually, the concept of numbers became concrete and familiar enough for counting to arise, at times with sing-song mnemonics to teach sequences to others. All known human languages, except the Piraha language, have words for at least the numerals "one" and "two", and even some animals like the blackbird can distinguish a surprising number of items.
The Computer History in time and space, Graphing Project, an attempt to build a graphical image of computer history, in particular operating systems. The Computer Revolution/Timeline at Wikibooks "File:Timeline.pdf - Engineering and Technology History Wiki" (PDF). ethw.org. 2012. Archived (PDF) from the original on 2017-10-31
500 nm 2.85 1994 R4600: QED: 100–125 MHz 64 650 nm 2.2 1994 R8000: MTI: 75-90 MHz 64 700 nm 3.43 1994 PA-7200: Hewlett Packard: 125 MHz 32 550 nm 1.26 1994 PowerPC 603: IBM, Motorola: 60–120 MHz 32 500 nm 1.6 1994 PowerPC 604: IBM, Motorola: 100–180 MHz 32 500 nm 3.6 1994 PA-7100LC: Hewlett Packard: 100 MHz 32 750 nm 0.90 1995 Alpha 21164 ...
An early portable computer with integrated monitor; the 5100 was possibly one of the first portable microcomputers using a CRT display. Sphere 1: 1975: A personal computer that was among the earliest complete all-in-one microcomputers that could be plugged in, turned on, and be fully functional. Tandberg Radiofrabrikk/Tandberg Data TDV-2114 ...
Timeline of free and open-source software (1976–present) Timeline of hypertext technology (1945–2001) Timeline of computer viruses and worms (1966–present) Timeline of social media (1979/1980–present) Timeline of Linux kernel development (1991–present) Timeline of computing; Microprocessor chronology; Timeline of programming languages
The history of the personal computer as a mass-market consumer electronic device began with the microcomputer revolution of the 1970s. A personal computer is one intended for interactive individual use, as opposed to a mainframe computer where the end user's requests are filtered through operating staff, or a time-sharing system in which one large processor is shared by many individuals.
Third-generation computers were offered well into the 1990s; for example the IBM ES9000 9X2 announced April 1994 [30] used 5,960 ECL chips to make a 10-way processor. [31] Other third-generation computers offered in the 1990s included the DEC VAX 9000 (1989), built from ECL gate arrays and custom chips, [32] and the Cray T90 (1995).
Alan Turing, English computer scientist, mathematician, logician, and cryptanalyst. (circa 1930) Before the 1920s, computers (sometimes computors) were human clerks that performed computations. They were usually under the lead of a physicist. Many thousands of computers were employed in commerce, government, and research establishments.