Loopback Connectors

For information on creating your own loopback connectors (for almost any type of external port), check out:
    1. http://www.randomc.com/~dperr/pcpinout.txt

      2. (straight text; you will have to "find" the section describing loopbacks: serial and parallel)
       
    2. http://www.geocities.com/SiliconValley/Bay/8302/serial.htm

      3. (only serial; not very informative, but there is a lot of stuff on this page)
       
    3. http://www.fbe.fh-frankfurt.de/mitarb/schellha/ic/hwb/menu_Cable.html

      4. (great page with both serial and parallel, and some other neat cable stuff)
       
    4. http://sunsite.csi.forth.gr/sunsite/net_tools/hwb/menu_Cable.html

      5. (same page as above, just a different site)

The wiring needed to construct serial loopbacks is as follows:

Standard IBM type 25-pin serial (female DB255) loopback pin connections: 

        1 to 7
        2 to 3
        4 to 5 to 8
        6 to 11 to 20 to 22
        15 to 17 to 23
        18 to 25
Norton Utilities (Symantec) 25-pin serial (female DB255) loopback pin connections: 
        2 to 3
        4 to 5
        6 to 8 to 20 to 22
Standard IBM type 9-pin serial (female DB9S) loopback pin connections: 
        1 to 7 to 8
        2 to 3
        4 to 6 to 9
Norton Utilities (Symantec) 9-pin serial (female DB255) loopback pin connections: 
        2 to 3
        7 to 8
        1 to 4 to 6 to 9