12/10/2023 0 Comments Osx version historyActually, somewhere between Rhapsody and OS X 10.0, there was a time when the GUI was not built for Intel. Rhapsody, which was basically OpenStep 5.0, also continued to run on Intel, but as mentioned before, Intel became a second-class architecture. It ran on PowerPC 604 Macintoshes (the 603 was not supported because it lacked a hardware pagetable walker) and was cross-compiled from OpenStep 4.2 running on Intel Pentium II CPUs. The first version of what would later be Mac OS X was “Rhapsody DR1” released in 1997. The first released version of Intel Mac OS X was a version of 10.4 for the Pentium 4 based “Developer Transition Kit” in 2005. ![]() ![]() In that time, Mac OS X was never self-hosting instead, it was cross-compiled on PowerPC Macs. Mac OS X existed for Intel all the time, but was not released. The Intel version had been “leading a secret double life” since 2000, i.e. ![]() But what machines and operating systems were used for cross-compilation and bringup of these systems? In order to find this out about Mac OS X, I talked to a few people working at NEXT and Apple, and people that worked on Mach and BSD.Ĭurrently, Apple only ships Intel-based machines. Mac OS X includes code from Mach and BSD, AmigaOS is based on TRIPOS, MS-DOS is a CP/M-86 clone and Windows NT is modeled after VMS. The heritage of different operating systems has been discussed many times.
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