I tried the jumper setting to enable 150 support,thinking that my MB wouldn't support the 300, but that didn't work. I sent the drive home with a buddy last night to see if his machine, a newer super-gamer, would recognize the drive.
At this point, I think I will just buy a new MB, processor, and RAM then get my old machine working enough to turn it into either a myth tv box or maybe another MAME machine.