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  2. x86 instruction listings - Wikipedia

    en.wikipedia.org/wiki/X86_instruction_listings

    Below is the full 8086/8088 instruction set of Intel (81 instructions total). These instructions are also available in 32-bit mode, they operate instead on 32-bit registers (eax, ebx, etc.) and values instead of their 16-bit (ax, bx, etc.) counterparts.

  3. Alt code - Wikipedia

    en.wikipedia.org/wiki/Alt_code

    However, numeric entry of Unicode characters is possible in most Unix or Unix-like OSs by pressing and releasing Ctrl + ⇧ Shift + U, and typing the hex number followed by the space bar or enter key. For example, For the registered trademark symbol ®, type Ctrl + ⇧ Shift + U, AE, ↵ Enter. For the no entry sign ⛔, type Ctrl + ⇧ Shift ...

  4. ROM hacking - Wikipedia

    en.wikipedia.org/wiki/ROM_hacking

    ROM hacking (short for Read-only memory hacking) is the process of modifying a ROM image or ROM file of a video game to alter the game's graphics, dialogue, levels, gameplay, and/or other elements. This is usually done by technically inclined video game fans to improve an old game of importance, as a creative outlet, or to make new, unofficial ...

  5. Aviation transponder interrogation modes - Wikipedia

    en.wikipedia.org/wiki/Aviation_transponder...

    The reply format is usually referred to as a "code" from a transponder, which is used to determine detailed information from a suitably equipped aircraft. In its simplest form, a "Mode" or interrogation type is generally determined by pulse spacing between two or more interrogation pulses. Various modes exist from Mode 1 to 5 for military use ...

  6. chmod - Wikipedia

    en.wikipedia.org/wiki/Chmod

    A numerical code permits execution if and only if it is odd (i.e. 1, 3, 5, or 7). A numerical code permits "read" if and only if it is greater than or equal to 4 (i.e. 4, 5, 6, or 7). A numerical code permits "write" if and only if it is 2, 3, 6, or 7. Numeric example. Change permissions to permit members of the programmers group to update a file:

  7. Gray code - Wikipedia

    en.wikipedia.org/wiki/Gray_code

    The binary-reflected Gray code list for n bits can be generated recursively from the list for n − 1 bits by reflecting the list (i.e. listing the entries in reverse order), prefixing the entries in the original list with a binary 0, prefixing the entries in the reflected list with a binary 1, and then concatenating the original list with the ...

  8. Hexadecimal - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal

    v. t. e. In mathematics and computing, the hexadecimal (also base-16 or simply hex) numeral system is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent ...

  9. List of file signatures - Wikipedia

    en.wikipedia.org/wiki/List_of_file_signatures

    List of file signatures. This is a list of file signatures, data used to identify or verify the content of a file. Such signatures are also known as magic numbers or Magic Bytes. Many file formats are not intended to be read as text. If such a file is accidentally viewed as a text file, its contents will be unintelligible.