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Low-cost single-board computer the size of a credit card. Also check the Raspberry Pi SE: http://raspberrypi.stackexchange.com/

Raspberry Pi Logo

Raspberry Pi is an ultra low-cost computer ($25 for Model A and $35 for Model B) which contains a RCA Video, HDMI, Audio, 256MB RAM, 700MHz CPU, and SD Card Reader.

For more information about the Raspberry PI, please visit the Raspberry Pi FAQ and the Raspberry Pi SE.

Schematics

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Image

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