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I ran OS/2 2.0 on 4MB quite comfortably on a 386 for quite a while back in the day. I have seen references stating that the minimum RAM requirements for version 2.1/2.11 were 6MB, but prior to that version it was always 4MB, and the version 3.0 (Warp) was also 4MB.
I believe this was because the version of Win-OS/2 (the Windows subsystem) changed from using Windows 3.0 (which used 8086 real mode) to version 3.1 (which used 286/386 protected mode) with 2.1.
This change involved some surgery on Windows itself. Parts of Windows 3.1 were customized in order to function properly on top of OS/2, where as Windows 3.0 could run practically unmodified on a standard DOSBox session.
Since Windows 3.1 needed more memory than Windows 3.0, that increased the minimum to 6MB if you used Windows Application. OS/2 itself did not ever need more than 4MB until Warp 4.0 (although 4MB was pushing it for v3.0, especially if you actually used TCP/IP).




Member since:
2006-07-14
I thought the article said that OS/2 2.2 needed 6mb of ram. I think we had four, or two. I can't remember exactly, but it wasn't 6 or above. I would imagine that OS/2 3.0 Warp would be the same or require more memory.