Introducing the guide to getting started with the Raspberry Pi: 
The first personal computer I purchased with my own money was a Packard Bell, back in the mid-1990s. What I remember about that computer was that for US$ 1,500, I had an Intel Pentium processor with a few megabytes of RAM, a modem to connect to my dial-up internet, and no other devices for internet connectivity.
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Supporting Open Source.
Have you tried: Diving with Sharks?