Subj : IDE
To   : TOM WALKER
From : Roy J. Tellason
Date : Fri May 27 2005 09:06 pm

TOM WALKER wrote in a message to MATT MC_CARTHY:

MM> BR> Look like Pin 39 should do; any recommendations for an interface?
MM> BR> My 1st choice would be a simple Op amp/LED driver circuit ... :)

MM>I would think with the above description I'd connect from pin #39
MM>to LED, to 470 ohm resistor, to +5V.  [I don't like bright LEDs].

TW> So it is Pin 39 instead of 20. Looks like a "Senior Moment" made me
TW> Forget how the pins were counted.

I guess there's probably some standardization when it comes to drives and such, 
 but I don't know if there is one for those kinds of connectors in general...

The pin type seem to use all numbers,  while the board-edge type have been 
known to use numbers on one side and letters on the other,  for at least some 
applications.

TW> On my 2 1/2 Laptop Hard Drive to IDE cable adapter it looks like a 
TW> Yellow/Purple/Brown resistor, the colo s are hard for me to make 
TW> out.

Me too,  with the newer,  quarter watt and smaller parts.  Yellow-purple-brown 
_would_ be 470 ohms,  though.

Seems like the manufacturers of resistors are using more colors that are 
"ambiguous" lately.  I find that a magnifying glass and strong lighting helps. 
:-)


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