Ive been reading over the mac specific code for netbsd, and I havent 
been able to find any references to the DAFB ( quadra 605 ) 
read/write register.

The register is used to combine the small ( 6 bit ) bus of the DAFB 
into the 12 bits it uses for its registers.
I cant remember the address off the top of my head, but it might be 
being relocated by the MMU anyway.

Does anyone know where it is located in the code?

TIA,
Jon.