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OS/2 1.0 is the first version of OS/2 to be released; it contained no GUI. It was originally meant to be DOS 5.0, and in fact, some early documentation refers to "DOS 5.0" rather than "OS/2".
<TODO: get build number of OS/2 1.0 RTM>
Did you know...
- This Version is the Only Version Compatible with IBM PC/AT