Developer Transition Kit
Efforts to run Mac OS X on non-Apple hardware utilized leaked copies of pre-release software. On June 6, 2005 Apple announced the availability of a Developer Transition Kit. This kit was made available to registered developers at a cost of $999. The first patches circumvented the Trusted Platform Module (TPM) that was included on the motherboard of the Developer Transition Kits. The TPM was required by the Rosetta technology that allowed software compiled for the PowerPC architecture to run on Intel-based architecture. Removing this requirement allowed Mac OS X to be installed on non-Apple computers. Rosetta also required microprocessors that included SSE3 instructions. Patches were released to the community which emulated these instructions with SSE2 equivalents and allowed the installation on machines without SSE3 support, although this produced a performance penalty. Being beta software, many updates followed its release.
In October 2005, Apple released update 10.4.3 to developers that required NX bit microprocessor support; however, patches were released to circumvent this.
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