RK611 disk controller

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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
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