Additional information about ribbon cables:

An additional type of ribbon cable was introduced for the ATA/66 IDE standard. It has 80 wires in the ribbon, but only 40 pins on the connector.

To identify Pin 1 on a ribbon cable:


       Arrow, Mark or "1"
      /
  ___/________________________________
  | ^                                |  Header 
  |__________________________________|  Connector
   ||                               |
   ||                               |
   ||                               |
   ||                               |
   ||                               |
   ||                               |
   ||                               |
   ||/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/  
     \               Ribbon Cable
      \
       Red Stripe

The red stripe on the ribbon cable indicates wire 1, and a small arrow, mark or the number 1 on the header connector indicates pin 1. All odd numbered pins are on one side of the header connector, all evens on the reverse.