Users will have to look elsewhere for pricey goodies like additional working memory, a SATA connection, a gigabit Ethernet port, and USB 3.0. The Raspberry Pi Foundation's goals with the RPi3 were to achieve compatibility, maintain pricing stability, and meet the demands of the educational market. Under the newly modified approach, the system first tries to boot via I2C, then via a microSD card or USB, until it finally searches via a DHCP query for a boot medium on the network. The new BCM2837 chip now has a modified boot ROM, which makes it possible to start a system via the network (PXE/TFTP) or a USB bulk storage device. Previous Raspberry Pi models could boot via I2C, although this function was rarely used. Network boot is another interesting new feature (see the box titled "Network Boot.") Even so, the WiFi and Bluetooth modules are mounted on their own ports and no longer need to share bandwidth with the remainder of the USB devices. Thus, this well-known Rasp Pi bottleneck still exists. The SMSC LAN9514 Hub chip separates a USB 2.0 port on the BCM2837 into four USB 2.0 ports and a 10/100Mbps network port. One drawback to the new card slot is that it might be difficult to remove a card without an assist from the spring action. ![]() ![]() This change prevents accidental ejection by mistakenly clicking on the card when inserting USB devices, which was a problem with models 2 and B+. Instead of the earlier push-push microSD slot, the third generation Rasp Pi comes with a customary microSD slot that accepts an SD card without the need for a spring mechanism. ![]() One detail worth mentioning is the change in microSD slots. Figure 2: The chip responsible for the Xenon flash is now covered with a black coating.
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