You just had to go by each manufacturer's documentation. I can say this with some authority, as I wrote some of said documentation during my several years at Mizar :-)
There is the spec, of course, but that only tells you what each board must implement so it can talk to the others across the backplane. Many VMEbus installations may not have even run an OS, just an event loop. If you ran pDOS or OS/9 or vxWorks (my own specialty at the time), you had to either get a driver from the manufacturer or write your own. Sorry to be the bearer of bad news. mcl
