Raspberry pie uses SD card as its "hard disk", or it can be externally connected with USB hard disk. With Raspberry Pi, you can edit office documents, browse the web and play games-even if you need a powerful graphics accelerator.
Raspberry pie is designed for learning computer programming education. It is just a microcomputer the size of a credit card, and its system is based on Linux.
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There are two types of Raspberry Pie: A and B. The main type of Raspberry Pie is 1 USB, without wired network interface, with power of 2.5W, 500mA and 256MB RAM；. Type b: 2 USB, supported by wired network, with power of 3.5W, 700mA, 5 12MB RAM.
ModelA has no network interface, so the four USB ports are reduced to 1. In addition, compared with ModelB, Model A has smaller memory capacity and smaller size design. Type a can be said to be a cheap version of type B.
Although it is a cheap version, the new model A also supports the same MicroSD card reader as the model B, 40-pin GPI connection port, Broadcom BCM 2385 arm11processor, 256MB memory and HDMI output port.
In terms of configuration, version B+ uses the same BCM2835 chip and 5 12MB memory as type B, but compared with the previous generation, version B+ has lower power consumption and richer interfaces.
In addition, the power consumption of model B+ is reduced by about 0.5W to1W. The old SD card slot is replaced by a more beautiful push-in microSD card slot, and the audio part is powered by low noise.
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