Mac System Software 4.0

4.0
Build of Mac System Software 4.x
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Architecture68k
Compiled
Timebomb
Works in
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Mac System Software 4.0 is a build of Mac System Software 4.x. It was released in January 1987 to fix bugs and update AppleShare to include a new Chooser and Control Panel. This is the last version of Mac OS to include support for the Macintosh 512K and 512Ke.

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