Suns crash when you unplug their console terminals.
      --------------------------------------------------
      
      
      A cable wired like this will connect your 4/330 (or any other
      Sun) to a dumb terminal, so that:
      
         1.   It works
              (the crossover bit is for that).
      
         2.   You can unplug the cable at the terminal end
              and the Sun will keep running
              (the resistor at the Sun end does that).
      
      If you never unplug the terminal, you don't need the resistor
      - until the terminal breaks!
      
      It is not exactly true that unplugging the terminal stops the
      machine. It stops when you plug it back in again! If you're
      reasonably lucky, typing 'c' (for continue) to the monitor
      prompt '>' will do what it says (press RETURN and see if you get
      a 'login:' prompt). Otherwise you must reboot (type 'b').
      
      
      If you can get the parts, you can probably fit the resistor
      inside the plug; it is no more fiddly to solder than D-type
      connectors are anyway.
      You may have local wisdom or direction about tying together
      slightly different combinations of pins, or about this economy
      3-core way to connect a terminal.
      
      I tried this with Cifer terminals, but it should work with
      anything.
      
      
      Sun end (plug)      Terminal end (usually socket)
      
           20 -                   - 20
               |                 |
            6 -                   -  6    Pins 6, 8 and 20 linked
               |                 |         inside the connectors.
            8 -                   -  8
      
      
            4 -                   -  4
               |                 |        Pins 4 and 5 linked inside
            5 -                   -  5     the connectors.
      
      
            2 --------     --------  2
                        X                 Wires to pins 2 and 3
            3 ----+---     --------  3     are crossed over.
                  |
            7 ---------------------  7    Pin 7 connected straight.
                  |
                 | |
                 | |  <---  2.2k resistor between pins 3 and 25
                 | |         at the end which plugs in to the
                  |                       Sun.
           25 ----

Rodney Tillotson                                      rt@uk.ac.rl.inf

R1, Rutherford Appleton Laboratory
Chilton, DIDCOT, Oxon OX11 0QX, UK                    +44 235 44 5899