Yeah, there isn't much info out there. One reason, I think, is because these systems are almost completely proprietary AND they are damned hard to work on. For instance, if you want to remove the hard drive, you have to basically disassemble the entire system... and doing that is a real tedious and time consuming chore. Plus, they are put together in a really funky way. The motherboard is on one side of the base plate, and the Bus is on the other -linked via a wrap around ribbon cable. I have no idea what they were thinking when they designed this system but one thing seems clear; they wanted it to be as heavy as they could possibly make it. I have in my hands here, a hard drive/card unit from a 6300, which is very similar to your 6310. The specs are: Seagate ST238R MFM drive (10meg) with a matched Seagate MFM controller card (Rom Version 1.7) Keep in mind that these early MFM drives required a matched controller card. Not any old MFM card will work. Another thing to consider is that that these cards might have additional code in their ROMS specific to the AT&T 6300 series. The 6300 was not IBM compatible so it had a lot of patches and such for running MS DOS 3.3 for example. The chances of you finding a working 5.25 MFM drive and card outside of another 6300 series system are slim. The 6300 is far more common than the 6310 or 6312, so in my opinion, it would be worth it to cannibalize a 6300 to find parts for a 6310. I don't know the manufacturer of the 5.25" floppy drive but you can bet that it was an "off" model drive. I have pics of my 6300 and 6312 on my web site at http://12.228.5.66