> I guess that there is no check built into MorphOS2.7 that searches which
> model Mac and what the CPU speed is, before proceeding with the installation
> script? I thought that there was some kind of check in the past, that would
> prevent installation from proceeding on Mac models that were not supported,
> but have nothing written by the Team to support such an thought.

Yes, according to some MorphOS Team members (e.g. geit) there really has been such a check that prevented MorphOS from booting (not just from installing) on unsupported models, but it's never been about CPU speed, else overclocking wouldn't have been possible without rendering MorphOS incompatible. AFAIK this check was said to have been about the model identifier, but which in case of the 1.42 GHz eMac wouldn't have prevented MorphOS from booting anyway, as that has the same ID as the older 1.25 GHz model that is explicitly supported:

http://www.everymac.com/ultimate-mac-lookup/?search_keywords=PowerMac6,4

Here it's really just that prior to MorphOS 2.6 the Radeon 9600 wasn't supported in any way.