Hey all, I came across an OS called MPX for the IBM 1800 system. bitsavers has some documentation, but again I was hoping to get some sense (or photo) of what it "looked like" - process control list, disk/memory resource, or how one might interact or "run" FORTRAN on it. My understanding is the 1800 was basically an upright (fridge-style) version of the 1130? MPX is described as supporting both real-time and background processing. A main use case seems to be in factory automation (power plants, oil refineries, steel mills). Per this article, it looks like there was an effort to make a PC (x86) port of this MPX around 1989. https://dl.acm.org/doi/pdf/10.1145/65294.71219 (to me, making it a comtemporary to MINIX) Searching for IBM MPX info is confused since it looks like CDC had an MPX OS in the 1980s, and Microsoft more recently had some components called MPX (along with Intel once upon a time having MPX instructions). So it's a fairly overloaded term. Around the year 2000, there was an interview with Ray Gwinn (developer of high performance SIO drivers for OS/2) - in there, he describes using MPX on an 1800, as early as 1968. bitsavers main MPX archive doc is a 5th adition from 1970. Not urgent, was just a curiosity. I didn't see MPX mentioned in this epic IBM OS discussion: https://www.youtube.com/watch?v=ip0cQiQjd18 Maybe IBM MPX got overshadowed by the RSX-11 systems - but there are claim that IBM 1800's being in use as recently as 2010. -Steve