> RLV11 and RLV12 controllers both work in q22 or Q18, the difference is 
> the RLV11 will only DMA in the lower 18bit address space.

No, it's worse than that for the RLV11: it pays no attention to BBS7,
and only decodes the 18 address lines to determine if it's registers
are being read/written.  So the RLV11 will appear at 16 different addresses -
15 of them shared with memory - on a Q22 system.

Tim. (shoppa@triumf.ca)