I have (most of) a RK611 controller that I don't need. This controller consists of: RK611 backplane (similar to a DD11-DK) M7900 RK06/07 Unibus interface M7901 RK06/07 register module M7902 RK06/07 control module M7903 RK06/07 data module Boot ROM for M9012 Bootstrap/Terminator Module *Note* however that the following module is missing: M7904 RK06/07 drive interface module If you're interested, make an offer. I'll probably accept it. Bill