Teddy, first what video i/o's are on the O2, as I recall, it ships with the "sgi" digital video in. There's an option for analogue, it may be extra. I'm not sure if the analogue option is y/c or just composite. From the way you make it sound, there is a y/c connector on the box.(posted 9205 days ago)If you had shot SDI in some form, Miranda (http://www.miranda.com) makes a little box called the vivo that allows importing uncompressed serial digital to the O2. Perhaps they're making a DV to sgi/SDI box now, check it out or ask them. The SGI digital interface is "backwards" - assumedly their proprietary code and you have to transcode the signal to industry standard SDI. Perhaps a transcoder that reads DV to SDI and then vivo into the O2. That's again, assuming your O2 vid i/o is digital.
I'm also assuming your copy of Premiere is Irix. If it's not, SGI/AW offer some sort of an Adobe apps bundle, check their site. And that bundle probably includes Premiere 5.1, much better than 4.2
And as with any other computer, you need storage space, if you don't have it already. Again, if I'm not mistaken, the vid i/o is right on the motherboard, so you can use a system chain for your drives, 68 pin scsi...
Or, sgi could have a dv-i/o for the O2 by now, all my rambling here is from memory. However, you have chosen a very cost-prohibitive platform to work on, your apps are going to be very pricey in Irix- land.
If you have the y/c i/o's available, use them. And get a ticket to NAB in Vegas in April to see what options you can get for your next project.
Hope this was of any help, good luck.