>>The Gestalt ID for the Quadra 605 is 94 and the Gestalt ID for the 
>>Performa 475 is 89. So at this level the two are not _exactly_ identical 
>>even if you change the faceplate.  If you dig a bit deeper into the ROMs 
>>you'll find that although the two share many common routines, they use 
>>some different sequences for ADB interrupt handling.  From a NetBSD point 
>>of view, if your Kernel is built on the MRG routines, the two systems are 
>>not _exactly_ the same, but very similar.
>
>This is not true.  There's a jumper, on the Q605's logic board, that if 
>present, makes Gestalt report the machine is a Q605.  If it's missing, 

Try working on the MRG code and getting it to support both of these 
systems. I think then you'll agree that the two are not identical.

-bob