https://en.wikipedia.org/wiki/Europe_Card_Bus
http://www.interfacebus.com/Design_VME_Connectors.html
https://www.retrobrewcomputers.org/doku.php?id=boards:ecb:ecbbusinfo
DIN41612 https://en.wikipedia.org/wiki/DIN_41612
https://au.rs-online.com/web/generalDisplay.html?id=ideas-and-advice/eurocards-pcb-guide