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Raspbian : ウィキペディア英語版
Raspberry Pi


The Raspberry Pi is a series of credit card–sized single-board computers developed in the United Kingdom by the Raspberry Pi Foundation with the intention of promoting the teaching of basic computer science in schools and developing countries. The original Raspberry Pi and Raspberry Pi 2 are manufactured in several board configurations through licensed manufacturing agreements with Newark element14 (Premier Farnell), RS Components and Egoman.〔(【引用サイトリンク】title=about the Licensed manufacturing deal )〕 The hardware is the same across all manufacturers.
All Raspberry Pis include the same VideoCore IV GPU, and either a single-core ARMv6-compatible CPU or a newer ARMv7-compatible quad-core one; and 256 megabytes of RAM, except later models (models B and B+) that have 512 MB,〔Transistorized memory, such as RAM, ROM, flash and cache sizes as well as file sizes are specified using binary meanings for K (10241), M (10242), G (10243), ...〕 and the Pi 2 has 1 GB. They have Secure Digital (SD) (models A and B) or MicroSD (models A+ and B+) sockets for boot media and persistent storage.〔 In 2014, the Raspberry Pi Foundation launched the ''Compute Module'', for use as a part of embedded systems for the same compute power as the original Pi.〔(【引用サイトリンク】title=Raspberry Pi Compute Module: new product! )〕 In early February 2015, the next-generation Raspberry Pi, Raspberry Pi 2, was released. That new computer board is initially available only in one configuration (model B) and has a quad-core ARM Cortex-A7 CPU and 1 GB of RAM with remaining specifications being similar to those of the previous generation model B+. The Raspberry Pi 2 retains the same US$35 price point of the model B, with the US$20 model A+ remaining on sale. In November 2015, the Foundation launched the Raspberry Pi Zero, a smaller product priced at $5.〔
The Foundation provides Debian and Arch Linux ARM distributions for download. Tools are available for Python as the main programming language, with support for BBC BASIC (via the RISC OS image or the Brandy Basic clone for Linux), C, C++, Java,〔(【引用サイトリンク】 title=Oracle Java on Raspberry Pi )Perl, Ruby,〔(【引用サイトリンク】 title=Event driven Raspberry Pi GPIO programming in Ruby )〕 and Squeak Smalltalk.
, about five to six million Raspberry Pis have been sold.〔https://blog.adafruit.com/2015/06/08/about-6-million-raspberry-pis-have-been-sold-raspberry_pi-raspberrypi-mattrichardson-twit-newscreensavers/〕〔(【引用サイトリンク】title=Five million sold! )〕 While already the fastest selling British personal computer, it has also shipped the second largest number of units behind the Amstrad PCW, the "Personal Computer Word-processor", which sold eight million.
== Hardware ==
The Raspberry Pi hardware has evolved through several versions that feature variations in memory capacity, and peripheral device support.
This block diagram depicts models ''A'', ''B'', ''A+'', and ''B+''. Model ''A'' and ''A+'' and ''Zero'' lack the Ethernet and USB hub components. The Ethernet adapter is connected to an additional USB port. In model ''A'' and ''A+'' the USB port is connected directly to the SoC. On model ''B+'' the chip contains a five-point USB hub, of which four ports are available, while model ''B'' only provides two. On the model ''Zero'', the USB port is also connected directly to the SoC, but it uses a micro USB (OTG) port.

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「Raspberry Pi」の詳細全文を読む



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