> >Just like you wouldn't have wanted to redo the microcode > >in your Vax 11/750, even if you could have. > > i thought several universities did modify the microcode in various ways, > to test some research ideas, or just to improve things.
like this one http://portal.acm.org/citation.cfm?id=1007771.55619 i had thought the purdue dual-processor vax had microcode changes, but indeed it did not. this machine for all the world looks like a modern intel i7 or amd opteron system. the issues discussed are also pretty much the same today. http://computer-refuge.org/classiccmp/dp_vax/dual-vax11-780.pdf - erik