< it did have the drives mounted vertical. As issued, it had an 81-294 < motherboard, and the 81-478 (U-ROM) EPROM. I believe that it had the < in-built modem and real-time clock as well. The Turbo-ROM was a major < improvement! that number doesnt match the the logic. there is no modem. Cannot tell on the Urom and the turborom replaced it. Yes, with turborom using teac FD55F or 3.5" drives I get 781k per drive. I retained the 360k drive for compatability. Allison