RK611 disk controller
From Computer History Wiki
The RK611 is the UNIBUS controller for the RK06 and RK07 moving-head magnetic removable cartridge disk drives. The RK611 can control up to 8 drives. PDP Perphials Handbook
The RK611 consists of a specially wired backplane and five hex cards, all of the designation M79xx. These are:
| M7900 | Unibus interface |
| M7901 | Register module |
| M7902 | Control module |
| M7903 | Data module |
| M7904 | Drive interface module |
