System 4

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System 4 is the fourth major upgrade of the Macintosh system software. First released in March 1987, it comprises of three versions in all.

[edit] Versions of System 4


System 4

System 4.0 | System 4.1 | System 4.2

← System 3 | System 4 | System 5 →

Macintosh system software
Macintosh System: System 1 | System 2 | System 3 | System 4 | System 5 | System 6 | System 7
Mac OS: Mac OS 8 | Mac OS 9 | Mac OS X
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