Again, a one page schematic that shows most of the differences between the B+ and the B model is available and easily found on this site. That schematic does not include any of the new
USB interface circuits apparently for no particular reason other than they do not want to which is a sad departure from the much more friendly attitude of earlier times. This change in attitude
has also carried over to the new Pi 2 model B where it appears that they do not intend to publish any schematics for it at all.
Any and all attempts to discover why these schematics have not been published is met with utter silence both on this forum (which is monitored by Element 14 personnel) and the Raspberry
Pi foundation forums which leads me to believe that they have no intention of doing so. It would be nice if they would at least come out and make their intentions known preferably with some
sort of explanation, reasonable or otherwise, as to why.
I recently purchased an ODROID-C1 which is a good alternative hardware wise to the Pi 2: ARM 1.5 GHz quad-core with a proprietary GPU, 1 GB RAM, micro HDMI, 4 USB 2 ports, 100/1000
Ethernet interface, mostly compatible 40 pin GPIO connector (pins 37 - 39 are used for an Analog to Digital interface), no camera interface. It has schematics available and documentation
for the SoC although it is new and lacks the community, commercial product support and "buzz" that has grown up around the Pi so in those ways it is at a serious disadvantage.
