QUOTE(OmegaX @ Aug 30 2005, 11:37 PM)
edit: this would work for the hdd activity also??
This exact circuit wouldnt because this one changes when the input is high or low (5v or 0v). Im pretty sure the IDE activity line is floating when no activity and low when there is activity (can anyone correct me on this?). If you go to my old thread here
and go to the last page, there is a schematic that will work for you. Just connect the 'trigger' wire to pin 39. Let me know if you need a better schem drawn up.