Published at LXer:
The large ecosystem of add-on boards is a key factor in the success of the Raspberry Pi, which torched the competition in our recent hacker board reader survey. Much of the Pi add-on business has moved to the Raspberry Pi Foundation’s HAT (Hardware Attached on Top) I/O specification, which launched in 2014 as an easier, more standardized way to extend the Pi’s 40-pin expansion connector.
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