Nice! I've just dragged my 6100/66 DOS out of the stack recently and am waiting on finding my HDI-45 adapter or buying another to plug it in and see what it does now. It used to run, but I never played with the DOS side of it.
Would be great if somebody with the boxed software were to make an image of all it entails, or at least the card specific stuff such as the DOS drivers and the PC Setup disks if they havent already. I guess for what its worth, DOS and 3.1 are easily enough obtainable and technically we can't be seen to be condoning "piracy" of such things so yes...