You can get very detailed ISA&#x27;s for GPU&#x27;s NVIDIA ones require an NDA (rubber stamped to some degree).<p>There have been quite a few Xbox 360 and Xbox SDK&#x27;s appearing on Ebay, even some of the early PowerPC based Mac Soft SDK&#x27;s for the Xbox 360 have appeared online so some one has them, too bad that people who buy them either collect them or in the case of the 360 dev box to create free XBLA gold accounts :P