You can do this without hacking hardware, using software connected via the USB
to 990 cable:
http://www.charliex.net/cpix/cpix.htm

As I recall, you need to install the USB driver from the NikonView CD that came
with the camera, and I recall a bit of a leap of faith when the software hung up
- the solution was to select USB mode before you do anything else, as the
software defaults to digital. Once you're on the air, it should do what you
want, and a bunch more, including mapping out your hot pixels!

Great little piece of software.

Mike


----- Original Message -----
From: bmcgown@...
To: coolpix990@yahoogroups.com
Sent: Wednesday, September 16, 2009 4:19 AM
Subject: [coolpix990] Shutter Release ??


I want to trigger the shutter of my 990 from a relay controlled by a
computer. I have a spare USB to 990 cable that I can hack. Could someone point
me to the pinouts of the 990 and the protocol for tripping the shutter.

If I can get it going I will post a link to my site where you can see the
finished project.

Many thanks in advance,

Bill
On a bayou in Mississippi





[Non-text portions of this message have been removed]