I have an early 64k 5150 PC, with an internal 10mb hard drive, and external power supply for the hd, and a Davong controller card. I figured I'd never get this thing running, but I lucked out and found another Davong ps and card, plus the original (July 1982) documentation and installation diskette!!!! $5 plus $20 shipping....a bargain for ebay! I finally got around to seeing if I could get it working. The drive in my machine is labelled 10 mg formatted. The docs and installation software mention 6mb and 12mb formatted drives...not 10mb. To install it, I followed the instructions in the manual...first, make a blank formatted bootable dos 1.10 floppy. Then copy the files from the Davong diskette to the new floppy. Now run the installation program, which configures and formats the hard drive. At first, I told it that the drive was 12mb, and it crashed during the installation. I changed to 6mb, and it worked fine. Now I have a system that boots from the floppy I made, and comes up in the A: drive...but that is the hard drive! B: is another partition on the hard drive (volume, actually), and C: is the floppy drive. Wierd to get used to. But PC DOS 1.x on a hard drive is a rather rare thing. I have a copy of PC DOS 1.00 also, and the Davong software has support for it also. That might be my next experiment. This drive identification scheme is just like on my Kaypro 10, which runs CP/M on it's hard drive (but the Kayrpo boots from the hard drive, unlike the PC) The Kaypro has user areas, which act a bit like the directories on DOS 2.x + -- Jim Visit the Selectric Typewriter Museum! http://www.mindspring.com/~jforbes2