I dont have a Skt 771 Supermicro board.
Its a Dell Precision 690 with a pair of Xeon X5365. It has the memory risers fitted too without firing it up I cant remember how much RAM it has installed. But Fully Buffered DIMMs are cheap as chips these days.
It has a Floppy connector yes, I specified a floppy drive when I configured it on the Dell web site because I intended to install Windows onto a SAS RAID disk, which meant I needed a floppy drive.
Back then slipstreaming wasnt a thing you could do, it was possible but it was a new feature introduced with SP2, which I think I had as it was about 3 years old when I got the system but it wasnt widely known as a thing and Dell said if you wanted to install Windows onto the array then you had to have a floppy drive. So I did.
It has an IDE channel used for the DVD-RW, 4 SATA 3Gb/s channels and 4 SAS PERC 5/i.
It has some free PCI slots, I will have to dig about in my box of bits to see if I have a DOS compatible sound card. Im pretty sure the onboard HD Audio wont work with DOS.