Wow. My google-fu must be not good enough, didn't find this page before! There are some philosophy differences between our designs, which is good - diversity is good. (tu) Good job.
Mine is trying to dump all the legacy 5V - actually it does, and not strive to keeping pin-out/physical compatibility with RAMPS, your does.
There are so many cheap ARM board out there - usually based on STM32, some are even cheaper than the Arduino Mega. However there are no de-facto standard design and hard to gain a critical mass. And now we have Arduino Due, albeit a bad design IMHO (No Ethernet, No high speed SD. I would wish for a Ethernet than JTag). AVR got the jobs done, but it is almost touching the limit. With ARM I hope a lot of opportunities - can't wait to see that come.
Mine is trying to dump all the legacy 5V - actually it does, and not strive to keeping pin-out/physical compatibility with RAMPS, your does.
There are so many cheap ARM board out there - usually based on STM32, some are even cheaper than the Arduino Mega. However there are no de-facto standard design and hard to gain a critical mass. And now we have Arduino Due, albeit a bad design IMHO (No Ethernet, No high speed SD. I would wish for a Ethernet than JTag). AVR got the jobs done, but it is almost touching the limit. With ARM I hope a lot of opportunities - can't wait to see that come.