Notes on the Revision 2.0:
The new Raspberry Pi Model B Revision 2.0 adds a few extras to the previous design. There has been a small change to the GPIO pin out of revision 2.0, to add ARM JTAG support and to present a different I2C peripheral from that which is (heavily) used on the camera interface.

Users wishing to produce portable GPIO code should either avoid using the these pins, or add code to check the board revision and behave appropriately. For more informations on pin changes check the Raspberry website post on the new board revision.

Raspberry Pi Model B Revision 2.0.

New Features:

• Two 2.5mm (drilled 2.9mm for M2.5 screw) non plated mounting holes.
• New USB Output Power - the resettable fuses have been removed permanently. It is now possible to power the RPI from a USB hub that back feeds power, but the hub cannot supply more than 2.5A under fault conditions.
• JTAG Debug Support - two GPIO pins have been interchanged to allow a missing debug signal (ARM_TMS) to appear on P1 pin 13.
• I2C Support on P1/P6 - the primary and secondary I2C channels have been reversed.
• Version Identification Links - the four GPIO signals originally used for version identification have been removed.
• Additional I/O Expansion - to utilise additional GPIO signals a new connector site P5 has been added. This carries the four GPIO signals named GPIO7 - GPIO10 respectively, along with +5V0, +3V3 and two 0V. Currently this connector is not populated.

Quick start guide
The setup described here is the simplest one, using just the USB ports on the board and a television or digital monitor. If you're a total beginner, please visit the beginners' section of the Raspberry Pi forums, where there are photos of what all the cables you'll need look like, and more hints and tips to get you started - the community is very friendly, and if you dive in, someone there will be happy to help you with any questions or problems you might have.

You will need:

• USB keyboard and mouse.
• Prepared SD card (see below).
• HDMI or composite television cable, OR a monitor with DVI or HDMI input, and an HDMI/composite cable.
• Micro USB power supply, make sure you use a good quality one, capable of providing at least 700mA at 5V. Do not attempt to power your Raspberry Pi by plugging it into a computer or a hub.
• Ethernet LAN cable (optional).

Raspberry Pi overview.

The SD card must be preloaded with an operating system before you can boot the Raspberry Pi. A brand-name (not generic) Class 4 card of 4GB or more is recommended. To obtain an SD card image, and for instructions on how to flash an SD card from a Linux or Windows PC, please refer to http://www.raspberrypi.org/downloads. Follow the instruction and install the boot image on the SD-CARD. If you're in trouble, the Raspberry Pi Wiki has written a detailed guide for beginners. We recommend that developers use the Raspian "wheezy" image, which includes Python, gcc, and a range of example applications.

Connect Everything Together:
Now follow these steps, make sure you connect everything properly before turning power ON and place your Raspberry Pi on a non-metal surface. To boot the Raspberry Pi, connect the monitor, mouse and keyboard, insert the preloaded SD card and plug in the power. If you don't plan to use more then 2 USB devices, you can simply ignore the USB hub, this is only needed if you need to add more devices.

1. Plug the prepared SD card into the RPi
2. Plug the USB keyboard and mouse into the RPi, perhaps via a USB hub. Connect the Hub to power, if necessary.
3. Plug a video cable into the screen (TV or monitor) and into the RPi.
4. Plug your extras into the RPi (USB WiFi, Ethernet cable, external hard drive etc.). This is where you may really need a USB hub
5. Ensure that your USB hub (if any) and screen are working.
6. Plug the Micro USB power supply into the mains socket.
7. With your screen on, plug the power supply into the RPi microUSB socket
8. The RPi should boot up and display messages on the screen.

It is always recommended to connect the MicroUSB power to the unit last (while most connections can be made live, it is best practice to connect items such as displays with the power turned off). The RPi may take a long time to boot when powered-on for the first time, so be patient! If you have inserted the Ethernet cable, the device will attempt to acquire a DHCP lease at startup. You can login with the username and password on the downloads page. If you're using the Raspbian use username: pi and password: raspberry. For superuser privileges, "sudo" does not require a password. Once you are logged in, you can start the X window system using the "startx" command. Digital audio is available via the HDMI connector. Analogue stereo audio is available from the 3.5mm jack.

New SD card images are released regularly at http://www.raspberrypi.org/downloads. Major areas of on-going optimisation include offloading the X window system to the GPU, which will speed it up considerably. None of the browsers for Raspbian "wheezy" support HTML5, and there is currently no Flash support, so unfortunately you cannot watch YouTube videos; we're investigating HTML5 solutions. (If you're desperate to watch YouTube, you'll need to put XBMC, Raspbmc or OpenELEC on an SD card, visit the Raspberry Pi forums to learn more.) There is currently no Java Virtual Machine (JVM) included in the default file system; we will address this in a future release.

Documents:

• Raspberry Pi Getting Started Guide
• Schematic
• Raspberry Pi Tutorials on Youtube
• Raspberry Pi Wiki
• Using the Raspberry Pi (forum)

Playing DOOM in Raspberry Pi