Daisy was one of the first ECAD workstations. Started out as 8086 Multibus up through 386. I never saw the earliest version of the OS. The later ones were unix-like. Last versions were Intel 386 PC based. Apple used them before switching to Valid or Mentor, depending on the project. I saw parts of a Calay at a surplus place in the mid 90's. There was also Racal/Redac PCB layout systems. I think I still have the packs from one of these. It ran RSX11 on an SMS disc controller. Most of the small stand-alone systems disappeared once IBM PC ECAD systems developed. There were one or two companies selling CAD tools into the Macintosh market, but they were pretty awful. There was one system that was popular for schematic capture on Macs that was used internally at Apple up through the late 90s. DEC used a schematic capture system from Stanford through the 70's and early 80's (SUDS, Stanford University Drawing System). The MIT CADR was designed using this as well.