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Mac OS 7.5.5

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Mac OS 7.5.5, also known as System 7.5.5, is a three-disk set of system software enhancements that delivers improvements in stability and performance for Macs and Mac clones. This update is for all Macs running Mac OS 7.5.3, and will result in the system being updated to version 7.5.5.

Mac OS 7.5.5 included Mac OS 7.5.3 Revision 2 already, making an installation of Revision 2 unnecessary.

Mac OS 7.5.5 must be installed on Mac OS 7.5.3; System 7.5 - Mac OS 7.5.2 users needed to transit through Mac OS 7.5.3 first before arriving at Mac OS 7.5.5.

Bug fixes

System requirements

Mac OS 7.5.5 requires Mac OS 7.5.3.

Users of Mac OS 7.5.4 may also directly upgrade to Mac OS 7.5.5.

Notes to old Macs

Mac OS 7.5.5 is the last system software release for all Macs based on the Motorola 68000 chips, as well as some other systems. These affect:

Motorola 68000 chip Macs:

Motorola 68020 chip Macs:

Other non 32-bit clean Macs:

The reason for ending support for these Macs is that future Mac OS releases will require a 32 bit clean-Motorola 68030, Motorola 68040, or PowerPC-based system which is 32-bit clean, which includes all other Macs.


System 7
System 7.0.x: 7.0 | 7.0.1 | Tune-Up 1.0 | Tune-Up 1.1 | Tune-Up 1.1.1
System 7.1.x: 7.1 | 7.1.1 (Pro) | 7.1.2 | 7.1.2P
System/Mac OS 7.5.x: 7.5 | 7.5.1 | 7.5.2 | 7.5.3 | 7.5.3L | 7.5.3 Rev 2 | 7.5.3 Rev 2.1 | 7.5.3 Rev 2.2 | 7.5.4 | 7.5.5
Mac OS 7.6.x: 7.6 | 7.6.1
Performa Systems: 7.0.1P | 7.1P | 7.1P1 | 7.1P2 | 7.1P3 | 7.1P4 | 7.1P5 | 7.1P6 | 7.1.2P
← System 6 | System 7 | Mac OS 8 →

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