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To be fair, I think Mac OS 7 had multiple monitor support.

• Someone 13y ago
  If you want to go back to last century: I think System 4.1 (shipping with the Macintosh II in 1987) had multiple-monitor support.
  • mamp 13y ago
    Wow, memory lane. Yes it did, with the new 'ColorManager' that could display the same window spread across the beautiful 640x480 color monitor and a B&W monitor. Very cool in the day.
    • protomyth 13y ago
      I like my dual setup with one monitor in portrait for documents, it was pretty cool for the time.
      • masklinn 13y ago
        The standard monitor of the Xerox Alto was in portrait: http://en.wikipedia.org/wiki/Xerox_Alto http://en.wikipedia.org/wiki/Xerox_Alto
        • protomyth 13y ago
          I don't think they had duals, there interface was kinda clunky, and they didn't have the DP programs the Mac had.
  • jgeorge 13y ago
    Indeed. I had two monitors on my Macintosh II back then - one color monitor and a portrait paperwhite monitor (forget who made it) for page layout.