WHat they say is the opening chords are B3 but correct the main riff is expected to be a DX. But some argue that it could be a Vox! Some say it was layers of different keyboards in the studio and the the DX later came out with a patch ready made.
Follow Mettelus's link and it explains it all pretty good.
http://www.korgforums.com/forum/phpBB2/viewtopic.php?p=643566&sid=ca3ecd9b597cedda927e556173029ebd#643566 It cool resurching this stuff as you end up on lots of other forums. There's a forum for everything. Mostly I'm finding stuff on keyboard player forums. One guy said he was breifly the 2nd keyboard player but before Brother in Arms was out.
There's a lot of talk about 88866008 or 88806688 if you know what I mean.. But the B3 dudes all agree it definatly a hamond on the intro.
One forum recomended a Martinic como VST as the best emulation of the sound and even gave out the settings..
http://www.martinic.com/combof/ Then there was a second 60 emulator by that company here;
http://www.vst4free.com/free_vst.php?id=1004.
But this resulted in me spending an hour downloading about 50 VST's and effects from that site. So check out VSTfor free if your looking for a huge collection of freebies.
http://www.vst4free.com/index.php?m=VSTi I'm on the road this weekend so can't try this out yet but even if I don't come close I now have some exciting new VST's to mess with. I love vintage keyboard sounds. MY first band had a ACETONE keyboard which we played Light my Fire with... holy crap,, this is it I found the picture... isn't she a beauty!