PCB revisions The rev E vs Rev C is a jumper, J21 Please find a link to the revisions. The board difference now is on the mbed web site. https://developer.mbed.org/teams/Renesas/wiki/Difference-of-GR-PEACH-hardware-vers Difference list of GR-PEACH revisions Revisions Descriptions ------- Revision B Prototype. Please refer to here about details. Revision C First edition Revision E Added a jumper 21(JP21)*. This revision and Revision C are no difference except for JP21. Revision F Changed silk screen. This revision and Revision E are no difference in function.