Mac OS 7.5.1

System 7.5.1 is a version of Mac OS 7, which was released on 23 March 1995. This version fixes a couple of bugs related to memory management and file operations.

It is the first version with Mac OS and its logo on startup, in preparation for the upcoming Macintosh clone program.

However the official name of the OS was still "Macintosh System" (it wasn't until version 7.6 that Apple officially adopted the new name).