It's easy to forget that the Raspberry Pi currently shipping is the more expensive model of the board. It is actually called the Model B as it sports more features than the $25 Model A. The main differences [compared to the B model] include a lack of an Ethernet port and the associated networking chip, as well as the presence of only one USB port instead of two. There was originally going to be less memory on the Model A (128MB instead of 256MB), but the Raspberry Pi Foundation managed to make enough cost savings during a redesign to increase the amount to 256MB on the cheaper version. With all the focus being on the Model B, we haven't actually seen the (near) final Model A board yet. But that changes today, as Eben Upton has justshown off the $25 board."
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