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In mathematics and computer science, base-, hexadecimal, or simply hex, is a numeral system with a radix or base of 16 usually written using the symbols 0–9 and A–F or a–f. The current hexadecimal system was first introduced to the computing world in 1963 by IBM. An earlier version, using the digits 0–9 and u–z, was used by the Bendix G-15 computer, introduced in 1956.

For example, the decimal numeral 79 whose binary representation is 01001111 can be written as 4F in hexadecimal (4 = 0100, F = 1111). It was IBM that decided on the prefix of "hexa" rather than the proper Latin prefix of "sexa". The word "hexadecimal" is strange in that hexa is derived from the Greek έξι (hexi) for "six" and decimal is derived from the Latin for "tenth". It may have been derived from the Latin root, but Greek deka is so similar to the Latin decem that some would not consider this nomenclature inconsistent. An older term was the incorrect Latin-like "sexidecimal" (correct Latin is "sedecim" for 16), but that was changed because some people thought it too risqué, and it also had an alternative meaning of "base 60". However, the word "sexagesimal" (base 60) retains the prefix. The earlier Bendix documentation used the term "sexadecimal". Schwartzman notes: “Since "hexadecimal" is a rather long word, it is sometimes abbreviated "hex". The word "hexadecimal" is unusual because Greek and Latin elements are combined; the expected purely Latin form would be "sexadecimal", but then computer hackers would be tempted to shorten the word to "sex".” Donald Knuth has pointed out that the etymologically correct term is "senidenary", from the Latin term for "grouped by 16". (The terms "binary", "ternary" and "quaternary" are from the same Latin construction, and the etymologically correct term for "decimal" arithmetic should be "denary".)

Several years ago an alternate, unambiguous set of hexadecimal digits was proposed. (Cf. Hexadecimal time)

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RT @kunter: In CSS3 I loved the HSL (Hue, Saturation, Lightness) definition for defining colors b/c playing around with hexadecimal combi…
css3watcher (css3watcher) Mon, 04 Jan 2010 10:15:02 -0000
RT @kunter: In CSS3 I loved the HSL (Hue, Saturation, Lightness) definition for defining colors b/c playing around with hexadecimal combi…
Now I should revise my hexadecimal-to-decimal, and then again, back-to-hexadecimal conversion functions; their services are no longer needed
kunter (kunter ilalan ✔) Mon, 04 Jan 2010 10:11:11 -0000
Now I should revise my hexadecimal-to-decimal, and then again, back-to-hexadecimal conversion functions; their services are no longer needed
In CSS3 I loved the HSL (Hue, Saturation, Lightness) definition for defining colors b/c playing around with hexadecimal combinations is hard
kunter (kunter ilalan ✔) Mon, 04 Jan 2010 10:06:20 -0000
In CSS3 I loved the HSL (Hue, Saturation, Lightness) definition for defining colors b/c playing around with hexadecimal combinations is hard
@hexadecimal Hope to see you and #1 daughter at Conquest NW (Jan 15-17). I'll have Railroad Tycoon/Railways of the World with me!
rafial (Wilhelm Fitzpatrick) Mon, 04 Jan 2010 07:44:13 -0000
@hexadecimal Hope to see you and #1 daughter at Conquest NW (Jan 15-17). I'll have Railroad Tycoon/Railways of the World with me!
@hexadecimal Puerto Rico is quite a classic. The "role selection" mechanic leads to some interesting decision making.
rafial (Wilhelm Fitzpatrick) Mon, 04 Jan 2010 07:43:08 -0000
@hexadecimal Puerto Rico is quite a classic. The "role selection" mechanic leads to some interesting decision making.
Pleasantly surprised by the game play of "Puerto Rico": http://tinyurl.com/2ppph7 . Number 1 daughter is 2 and 0 over the weekend
hexadecimal (Bob Kuhar) Mon, 04 Jan 2010 07:41:26 -0000
Pleasantly surprised by the game play of "Puerto Rico": http://tinyurl.com/2ppph7 . Number 1 daughter is 2 and 0 over the weekend

 
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010 Editor - Hex Editor - A new generation of hex editor capable of parsing a binary file into a data structure for easy editing. Features unlimited undo/redo plus many analysis and editing tools.
Meta Description: [ 010 Editor: Professional hex editor with Binary Templates. A fast, flexible, easy-to-use hex editor. ]

Cygnus Hex Editor - Fast, simple operation delete or insert characters as easily as with any word processor. MDI (Multiple Document Interface) design allows side-by-side file editing; supports multiple windows on the same file. [Windows 95/98/ME/NT/2000/XP]
Meta Description: [ The fastest and easiest hex editor now with many powerful new features. ]

Cygnus Hex Editor - Offers a simple interface with many extras, that include full insert mode, multi-level undo/redo, extensive drag-and-drop support, and MDI interface.
Meta Description: [ SoftCircuits develops cutting-edge software for Microsoft Windows and also provides consulting and free downloads. ]

FileRay - Binary file editor and hex editor viewed and edited, field type declaration syntax allows static and dynamic dependencies. Download, screen shots, help file, and report a bug. [Windows ME/98/95/2000/NT 4.x]

FT2001 - Hex edit with the capability of search, zip, unzip, DES encryption and split functions.

Hex Editor Pro - Professional HEX editor, edit any file in three different modes: Hexadecimal (HEX), Binary (BIN), or Octal (Text). Tool for any programmer, developer, or web designer, used for software debugging, cheating, and editing files containing non-text symbols. Search and replace save file in any of three modes.
Meta Description: [ Hex Editor II is a hexadecimal editor that helps an average PC user edit large files, containing non-textual data, safely and easily. Unlike other hexadecimal editors, Hex Editor II has two inbuilt plugins: hex calculator, and base converter, as well as the ability to edit files in any of the fou... ]

Hex Workshop - Combines advanced binary editing, with the ease and flexibility of a word processor. It lets you edit, cut, copy, paste, insert, and delete hex, print customizable hex dumps, and export to RTF, or HTML.
Meta Description: [ Hex Workshop: Hex Editor, Sector Editor, Base Converter and Hex Calulator for Windows ]

HexEdit - Windows Hex Editor - Binary file editor with an easy to use user interface somewhat like MS Word or Visual Studio. It has many displays and editing options including comprehensive undo, autofit, INS/OVR modes, keystroke macros, fast searches and compares.
Meta Description: [ Windows hex editor: user-friendly and reliable with advanced features (full undo, macros, background searches, calculator, full customization, edits huge files) ]

Hexprobe - Offers a featured process viewer, multibyte hex calculator and a data interpretation tool.
Meta Description: [ Hexprobe System focuses on developing and supporting a set of system utilities. ]

M L Software Ltd - Develops software for MS Windows and Palm OS. ML Hex Editor is a 32 bit Windows program for manipulating binary files in various ingenious ways. Checks and computes a range of Cyclic Redundancy Checks.

Mikersoft HEXtreme Hex Editor - Color-coded Hex editor for Windows. Customize color coding by setting byte or byte range colors to make files more readable to you. Search by hex string, common ASCII string, or Unicode strings.
Meta Description: [ DreamSys Software is dedicated to developing real-world software solutions. Our specialization is in network and tcp/ip winsock applications. ]

UltraEdit Professional Text HEX Editor - Program is a 32-bit powerful full-featured programmer's editor. Some of the features include, multiple windows, unlimited file sizes, powerful search and replace tools, macro support, file format conversion between DOS and UNIX and integrated IME support and other.
Meta Description: [ UltraEdit is the #1 selling, most powerful, value priced text editor available! The ideal text, HEX, HTML, and programmer's editor! Free trial period... Industry award winner... Nearly 1 million users licensed worldwide... ]

WinHex - Universal hexadecimal editor, supporting hard disks, floppy disks, CD-ROM and DVD media. Provides the ability to concatenate, split, analyze, compare and convert files.
Meta Description: [ WinHex hex editor, disk editor, RAM editor. Binary editor for files, disks, and RAM. Download HEX EDITOR. Sector editor. Drive editor. ]

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