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PC/104 (or PC104) is a family of embedded computer standards which define both form factors and computer buses. PC/104 is intended for specialized environments where a small, rugged computer system is required. The standard is modular, and allows consumers to stack together boards from a variety of COTS manufacturers to produce a customized embedded system.〔 (【引用サイトリンク】 url = http://www.pc104.org/technology/index.html )〕 The original PC/104 form factor is somewhat smaller than a desktop PC motherboard at . Unlike other popular computer form factors such as ATX, which rely on a motherboard or backplane, PC/104 boards are stacked on top of each other like building blocks. The PC/104 specification defines four mounting holes at the corners of each module, which allow the boards to be fastened to each other using standoffs. The stackable bus connectors and use of standoffs provides a more rugged mounting than slot boards found in desktop PCs. The compact board size further contributes to the ruggedness of the form factor by reducing the possibility of PCB flexing under shock and vibration. A typical PC/104 system (commonly referred to as a "stack") will include a CPU board, power supply board, and one or more peripheral boards, such as a data acquisition module, GPS receiver, or Wireless LAN controller. A wide array of peripheral boards are available from various vendors. Users may design a stack that incorporates boards from multiple vendors. The overall height, weight, and power consumption of the stack can vary depending on the number of boards that are used. PC/104 is sometimes referred to as a "stackable PC", as most of the architecture derives from the desktop PC.〔(【引用サイトリンク】url=http://embedded-computing.com/articles/pc104-stackable-pcs-isa-pci-pci-express/# )〕 The majority of PC/104 CPU boards are x86 compatible and include standard PC interfaces such as Serial Ports, USB, Ethernet, and VGA. A x86 PC/104 system is usually capable of standard PC operating system such as DOS, Windows, or Linux. However, it is also quite common to use a real-time operating system, such as VxWorks. ==History and Standardization== The PC/104 bus and form factor was originally devised by Ampro in 1987 (led by CTO Rick Lehrbaum),〔 〕 and later standardized by the PC/104 Consortium in 1992.〔 (【引用サイトリンク】 url = http://www.pc104.org/history.html )〕 An IEEE standard corresponding to PC/104 was drafted as IEEE P996.1, but never ratified.〔 〕 In 1997, the PC/104 Consortium introduced a newer standard based on the PCI bus.〔 (【引用サイトリンク】 url = http://www.pc104.org/history.php )〕 A PCI Express based standard was introduced in 2008.〔 (【引用サイトリンク】 url = http://www.pc104.org/news_consortium.php?id=53&all=yes )〕 PC/104-related specifications are controlled by the (PC/104 Consortium ). There are currently 47 members of the Consortium.〔(【引用サイトリンク】title=PC/104 Consortium Membership Directory )〕 All specifications published by the Consortium are freely available. Membership in the Consortium is not required to design and manufacture a PC/104 board. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「PC/104」の詳細全文を読む スポンサード リンク
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