+-------------------------------+
RT-11 Unit 0    |       MSCP Unit Number        |
                +---------------+---------------+
                |  Port         |  Partition    |
                +---------------+---------------+
RT-11 Unit 1    |       MSCP Unit Number        |
                +---------------+---------------+
                |  Port         |  Partition    |
                +---------------+---------------+
                .                               .
                .                               .
                .                               .