EZ Drummer on Yamaha Keyboard?

[Galoopa]

I realize there was another topic about this just a little bit below this, but I'm just wondering...

I have a fairly cheap Yamaha Keyboard ($150 PSR300AD or something) and I was wondering if it's possible to purchase EZ Drummer, get the realistic sounds into my keyboard and KEEP / STORE them into the keyboard forever?

In other words, do you have to use the computer to make the realistic drum sounds or is there a way to store them into the keyboard itself so I can perform the drum noises at gigs and stuff?

Do I have to have a USB cord or can I just use the input thing on the back of my keyboard to setup?

I'd appreciate any help.