The updated Pi 2 Model B design is based around a Broadcom BCM2836 SoC, which includes an Quad Core ARM7 900 MHz processor, VideoCore IV GPU, and 1 Gigabyte of RAM. This revision Pi 2 Model B board features four mounting holes for easy installation, a built-in reset circuit, and can be powered via the USB data ports. The design does not include a built-in hard disk or solid-state drive, instead relying on an microSD card for booting and long-term storage. This board is intended to run Linux kernel based operating systems. The Raspberry Pi uses Linux-kernel based operating systems. The Raspberry Pi does not come with a real-time clock, so an OS must use a network time server, or ask the user for time information at boot time to get access to time and date info for file time and date stamping. However a real time clock (such as the DS1307) with battery backup can be easily added via the I2C interface. Board Specifications Processor: ARM7 900Mhz CPU USB: Four USB 2.0 Ports Ethernet: 10/100 Ethernet Port Video Output: HDMI and Composite Sound: L/R Stereo Memory: 1GB Ram Operating System: Uses microSD card slot to load O/S Digital interfaces: 2 onboard ribbon slots for Camera and Display GPIO: 40 GPIO pins, backwards compatible to B and B+ board