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
\ Ribbon Cable
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.