Diagnostic Port (2004)
folklore.org
folklore.org
I wonder how this was all squared with the introduction of USB on the iMac? It appeared to me that the wider adoption of USB happened in part because of it being included on the original iMac series (it may just have taken that long to get traction as most technologies seem to need a while, particularly if there is an alternative as there was on PCs with parallel and PS/2 ports), and USB has been a huge boon in terms of connectivity for most people. I wonder if there was any similar push for no USB, or a proprietary Apple connection (a la ADB) - anyone know?
Other words that might get at the same point: the "Design Considerations for an Anthropophilic Computer" document [1] describes a structuring of components that does not favor people who enjoy tinkering over those who don't.
[1] http://web.stanford.edu/dept/SUL/sites/mac/primary/docs/bom/...