Distribution of EARN/BITNET hosts by operating system
                  Source: VERS9104                   
 
            +--------+-----------------+
            | System | Number of nodes |
            +--------+-----------------+
            | VMS    |    1552 (46%)   |
            | VM     |    1050 (31%)   |
            | Unix   |     281 ( 8%)   |
            | MVS    |     177 ( 5%)   |
            | Other  |     302 ( 9%)   |
            +--------+-----------------+
            | Total  |    3362 nodes   |
            +--------+-----------------+