Raspberry Pi 2 - Then and Now, a Comparison
 

"It's been 3 years since the original Pi launched and seemed to single-handedly send the internet into meltdown. In the intervening years, several new versions of the board have been released, each adding small incremental improvements, with an additional 2 USB ports being added to version B+ and the RAM being doubled from 256MB (in versions A to B Rev1) to 512Mb in subsequent models. Due in no small part to the incredible demand for the Pi, it was some time before I was able to get my hands on one, picking up the model B rev 2, which came with just 2 USB ports and a friction lock SD card slot."

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