On OS X 10.8, you are unable to double-click to open apps that didn't come from a verified source or from the Mac App Store. In the Wind32DiskImager program make sure to select the Write option when extracting the image file to your SD card. If you are having trouble with the RPi SD card builder software, try Pi Filler. The file can be downloaded from the PetRockBlog Web site, it must then be extracted to your SD card using the program Wind32DiskImager on Windows or RPi SD card builder on OS X. The team behind the project have created a ready-to-use SD card image that will automatically install the Retro Pie software. I also picked up a USB Hub for connecting more components, but this is optional. A Micro-USB power supply capable of outputting at least 850 milliamps at 5 volts is needed to power the device, while an SD card reader (unless the computer you are using has one) is needed to transfer the operating system to the card. Other items you will need include a monitor connected through either AV or HDMI, an Xbox 360 controller, an Ethernet cord or wireless USB adapter, a 4GB Class 4 SD card or better, a USB keyboard, and a USB flash drive.
The device is the same price as the original Model B, however it includes a total of four USB ports, a microSD card slot rather than a full, better audio, and has lower power requirements. Update: A newer model, known as the Raspberry Pi B+, was recently announced and made available for purchase. The Model B - which can be had for $35 in theUS, £27.44 in the UK, or AU$37.35 in Australia - adds an additional USB port, an Ethernet port, and doubles the memory to 512MB. The Retro Pie can work with either the $25 (£18.65 in the UK, and AU$28.50 in Australia) Raspberry Pi Model A or the slightly more expensive Model B, I recommend the latter. If this is your first time with the Raspberry Pi, I suggest you check out my earlier article for more information about the device. The project is a little difficult and requires you to input various lines of code, but you should be fine if you follow these directions. One of the coolest projects is called Retro Pie, which transforms the Raspberry Pi into a retro gaming console and gives you the ability to play classics like Super Mario Bros., Space Invaders, Sonic the Hedgehog, and many others. The low-cost microcomputer has been used to power home automation projects, servers, media centers, and many other do-it-yourself projects. The projects people have created with the Raspberry Pi are truly incredible.
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