Poked around with the card a bit more. got a copy of dos 2.11 and used mikey99's 2.3 disk. The system seemed to smooth out and seemed less jerky. So I would venture a guess that this card was made with 2.11 in mind and NOTHING ELSE. Since I want DOS 5 on my system (for multiple reasons), i'm probably going to sell this card. I already have one PM and if it doesn't work out expect to see it on the VCG marketplace. That said, i'm looking for a model 25 hard disk and I'd straight up trade for a working one.