After my last batch of Altos machines I managed to acquire a nice Alto's 580. I believe it is the HD model because there is only a single floppy in it. It came with some software most of it originals (MPM, Diags, etc) and about 10 or so original manuals. It powers up fine but I don't have the cable to hook it up to my terminal. The terminal I have is an ADDs model with keyboard/CRT that I am also considering selling (have the manual for this too).