Perhaps the more significant &quot;accident&quot; of history, occurring before IBM-PCs with much memory got out there in large numbers, was all the vendors of 68000 based systems who didn&#x27;t follow the lead of Apollo Computer and instead got a relatively cheap UNIX(TM) licence.<p>As PCs got more capable and more and more people were willing to program them in C---I don&#x27;t remember Borland being a big player in this, in fact, it was Microsoft that produced the first <i>really</i> solid C compiler---the same sorts of constraints that helped birth UNIX(TM) and C were in play, until it was by and large too late to change course.