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Introduction
The Raspberry Pi™ went on general sale at the end of February 2012 and immediately crashed the websites of the suppliers chosen to take orders for it.
Since then a number of new models culminating in the Raspberry Pi 4 (at the time of writing) have been released. So what was so special about this little device and why has it created so much interest?
What Is the Raspberry Pi?
The Raspberry Pi 4, shown in Figure 1-1, is a computer that runs the Linux operating system. It has USB sockets you can plug a keyboard and mouse into and no less than two HDMI (High-Definition Multimedia Interface) video outputs you can connect a TV or monitor into. Many monitors only have a VGA connector, and Raspberry Pi will not work with this. However, ...
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