Ok... I am an expert on nothing... only an enthusiast apprentice that repeats like a parrot what Zozo, Istvan, LGB, Geco and a long list of other geniuses say here, on recent times including you.
I have managed to modify three computers, and this means exactly that. The research of the information that has lead to the knowledge is the work of Zozo, but not only from him, because overclocking on the EP has some tradition on Hungary, with even commercial products, or at least is what I have understood, when Zozo mentions one type of clock switch better than the one he uses.
Also is truth that the EP was projected with a 6Mhz Z80 clock in mind, some proofs can be seen on its code, ask Bruce about it.
And now that you mention the Enterprise sequel.... it was already projected, effectively with a 6Mhz clock as standard. It had shape and was real, now we know. You can see it on
Werner's thread.