Hello Andy I think this are the information you want to have.
On 2018-08-04 20:22, Christian Lamparter wrote:
As for the APUs. The vendor (PC Engines) happily provides PDFs and schematics for their boards: <https://www.pcengines.ch/pdf/apu1.pdf> <https://www.pcengines.ch/schema/apu1c.pdf> <https://www.pcengines.ch/pdf/apu2.pdf> <http://pcengines.ch/schema/apu2c.pdf>
