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 consists of four 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 | 

