Imagine, how things could have been...
No. Let's not. It makes me want to cry. :cry:
But seriously, that deal probably would have made the 68k the mainstream chip. Therefore, it's logical to assume that the product line would have been expanded, and we'd probably have 68090s by now.
Amiga Format ran a news article once about theoretical speeds of an 060. They went into the 200MHz+ zone with refined manufacturing. There's a lot of technological potential left in 68k, just not financial.
