[cctalk] Re: RK11-D register address assignment

Check the PDP-11 Architecture Handbook (1983-84) Appendix A — Assignment of Addresses and Vectors, for DEC’s preferred addresses for devices. The default address for an RK11 is 777400 with an interrupt vector of 220. You can put it anywhere you want that doesn’t conflict with another device, but the benefit of using the DEC default is that things like bootstrap code and pre-built s/w images will find and use it at the default address. —Milo