In a message dated 10/25/01 2:15:45 PM Pacific Daylight Time, dhquebbeman(a)theestopinalgroup.com writes: The Z-80 Altos was the 580. This was the same squashed hexagon design used in the 586, 786 etc. Since it was a multiterminal machine each terminal had it's own Z-80 IIRC. These ran CPM and MPM. The 586s were an 8086 16 bit designs. Most of the ones I saw ran Xenix. however I had a couple that ran MPM-II based on a version of Digital Research DOS-86, I can't remember what it was called. Most 586s were of the squashed Hex design that I think Doug is calling DGish. I do seem to remember the first 586s were shipped in a square box, a la the 8XXX series. Of course my memory could be off, it has been a long time and I never saw one of those. Paxton Astoria, OR