On Fri, 30 Aug 2019, Clem cole wrote:

> Btw. The issue with the 68k was Nick Tredenick’s original Microcode did 
> not save enough information during some of the faults.  Les Crudele once 
> told me, that it turns out he had tried to fix it but there were a 
> series of errors and some short cuts they used to fit it in the store. 
> They gave up trying to fix it as the part was purely skunkworks and they 
> could not respin it at the time.  After it succeeded and were a real 
> project, the difference between the original and the 10 was Nick redid 
> the microcode but they had made a larger microstore - otherwise 
> basically the same Si.

Yep, that certainly rings a bell.  ISTR that Sun had a board with the two 
CPUs, one keeping an eye on the other.

Ah, those were the days :-)  Now, we just have to put up with Intel, 
although I believe the ARM is much better.

-- Dave