Columbia University Computing History   
HERMIT PROJECT COMPONENTS AND STATUS, SEPTEMBER 1986
                                                                Legend:

+----------------------------------------------------------+    (1) Done by us, debugged (4) Partly done (7) Easy to do     
|                    Common File System (8)                |    (2) Done, being debugged (5) Designed    (8) Existing service
+----------------------+-------+-------+-------------------+    (3) Almost done          (6) Done once   (9) Not designed
                       |       |       |
 DEC-20s               A       B       D                               VAX/UNIX hosts                VM/CMS hosts
+-----------------------------------------------------------+         +-------------------+         +-------------------+
| file    mail    telnet  print   finger   message  library |         | name     other    |         | CLIO     other    |
| server  server  server  server  server   server   info    |         | server   services |         | server   services |
|  (1)     (5)     (8)     (8)     (8)      (8)      (9)    |         |  (9)      (1-9)   |         |  (9)      (1-9)   |
+-----------------------------------------------------------+         +-------------------+         +-------------------+
                       A       B       D                                       C                          A       B
                       |       |       |                                       |                          |       |
Backbone Ethernet      |       |       |                                       |                          |       |                
-----------------------+-------+-------+-----------+---------------------------+--------------------------+----+--+----------
                                                   |                                                           |   
                    MicroVAX Cluster Server        |                                               MicroVAX Cluster Server
                   +-------------------------------+---------------------------------+           +--------------------------+   
Communications     |  TCP/IP/Ethernet (8)                                            |           |                          |   
                   +-----------------------------------------------------------------+           |                          |   
Back End Client    |  (8)    (5)    (8)    (8)      (7)       (1)     (9)            |           |                          |  
Application        | telnet  mail  print  finger  message  file/disk  CLIO   bid (9) | < - - - > |  bid (9)                 |  
PC Server          |  (1)    (1)    (1)    (1)      (1)       (*)     (9)            |           |                          |   
                   +-----------------------------------------------------------------+           |                          |   
Session Layer      | Hermit (2)                                                      |           |                          |   
                   +-----------------------------------------------------------------+           +--------------------------+   
Datalink/          | TCP (8)            :                                            |                                            
Transport Layer    |                    : - - - - - - - - - - - + Hermit (1)         |                                        
                   |                    :         LAT (8)       :                    |
                   +--------------------------------------------+--------------------+                                           
Physical Layer     | Ethernet (8)                               | RS-232 (1)         |
                   +--------------------+-----------------------+------------+--+--+-+
                                        |                                    |  |  |
Local Ethernet                          |                                    |  |
---------------+------------------+-----+------------------+-------          |
               |                  |                        |                 |  * Disk service:
               |            +-----+--------+     +---------+---------+       |    MS-DOS            (1)
               |            | Kinetics (8) |     | DEC LAT Box (8)   |       |    Pro/380 2.9BSD    (6)
               |            +-----+--------+     +---+---+---+---+---+       |    Macintosh         (6)
 Pro/380       |                  | Appletalk        |   |   |   | RS-232    |
 2.9BSD        |            --+---+--+--+------      |                       |
 (1)           |              |      |  |            | Rainbows or PC/ATs    |  MS-DOS
+--------------+--------+   +-+---+           +------+-----------------------+----------------------+
| Using standard TCP/IP |   | Mac |           | RS-232 (1)                                          | Physical Layer
| applications for now  |   | (6) |           +-----------------------------------------------------+
| (ditto for VS2)  (8)  |   |     |           | Hermit transport (1)                                | Datalink/Transport
| Hermit disk driver(6) |   +-----+           +-----------------------------------------------------+
+-----------------------+                     | Hermit session (2)                                  | Session Layer
                                              +-----------------------------------------------------+
Tools:                                        | login  print   mail  telnet  finger message   disk  | Application Layer
  ccmd (MS-DOS, Unix) (1)                     |  (1)    (1)    (1)    (1)     (1)     (7)     (1)   |
  TCP/IP interface functions (Unix) (1)       +-----------------------------------------------------+              
Columbia University Computing History Frank da Cruz / fdc@columbia.edu Diagram created: 1 March 1987 Last update: 29 March 2021