I'm going to meet a guy tomorrow who says he has six Osborne 1s that I can take my pick of, and at least some (maybe all) of them boot and read disks. I own and have restored two Osborne Executives, and I'm familiar with the major differences between those and the Osborne 1. I also know there were two case designs for the Osborne 1, and I believe these are all the later design (same case as the Executive). Are there any common features or upgrades I would be able to identify just by looking at them in case they aren't all the same? Is the black/white or black/green screen rarer or more desirable than the other? I know some Osborne 1s were upgraded with double-density drives, but I kind of want one with single-density drives because my Executives already have double-density drives. Is there any way to tell what type of drives they have besides trying to read a double-density disk and seeing if it works (not sure I want to stick any of my disks in an unknown drive)? Any general tips or things to look for? Thanks!