> >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

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