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Classic Mac OS
4 operating systems
Classic Mac OS — operating system
| Operating system | Developer | First release | License |
|---|---|---|---|
| Mac OS 8 | Apple Inc. | — | proprietary license |
| Mac OS 9 | Apple Inc. | — | proprietary license |
| System 6 | Apple Inc. | — | proprietary license |
| System 7 | Apple Inc. | — | proprietary license |