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IOP Architecture

The IOP Architecture has never been documented but it has been mentioned that the IOP Manager and implied IOP Architecture was never documented because it was thought that this was a propriertary advantage. The IOPs are mentioned breifly in various tech notes and the Guide to Macintosh Family.

The best documentation is presented in a description from Apple's Technical Support reformatted locally:

Apple Tech Support Description

I have been also playing with MacsBug trying to reverse engineer parts of the IOP communication:

HWPriv()
IOPInfoAccess()
IOPMoveData()
IOPMsgRequest()