Where can I find an IDE cable to fit my minipac?

[Dervacumen]

So I've gone through all my IDE cables looking for one to hack onto my minipac and start my next project.  The problem is, all of my IDE cables are keyed differently than the header on the minipac.  Mine all have a blocked pin hole in the middle of one of the rows on the cable, and the minipac has the blocked pin hole on the end of the header.
Am I in an alternate universe?  I can't find any other examples of the problem.

Where can I get a cheap IDE cable with a plug that is keyed for the minipac?

[knave]

Older IDE cables were not keyed at all.  Funny that I never looked at this.  I just got a Minipac and would be in the same boat except that I'm pretty sure that I have some of the older cables laying around.

Or are we missing something?

[Dervacumen]

BAM!  That's it.  I picked up a free PIII 866 last week from Craigslist and I just yanked an old cable for the DVD drive.
Success!  It's not keyed, as Knave pointed out.  I'm in business.  Thanks!

[SavannahLion]

Yeah, it's pin 20 that's keyed. I've seen it on some of my (P)ATA acables but never thought much of it. I don't recall if I had/have any cables where this isn't keyed though. I had kind of assumed that Ultimarc keyed theirs the same way.

I took a peek at his wiring diagram and noticed he's keying Pin 1, not Pin 20 on the header.

So I dug around on the standards a bit. It seems it's just not a simple case of, "let's grab any IDE cable." It looks like ATA specification forcefully blocks pin 20, ie keys it. IDE cables also keys pin 20, but I couldn't find any mention of IDE cables specifically blocking this pin. I assume, back in the day, they just cut the pin on the board and depended on that to key things. The 80-wire standards are spec'd the same way.

On the Ultimarc website, it specifically states to use a standard IDE cable. I guess that's um... the key.

Maybe Ultimarc should mention the differences between the cables so people don't trip over this. Maybe even put an explanation into the Wiki? Especially since there might be more scrounging for this cable.

[AndyWarne]

Good spot, yes. Most older cables were not keyed, but many recent ones are. I will add this info.
Andy