Aaron Kulkis wrote: > James Knott wrote: >> The Data General Eclipse line had a feature called "Writable Control >> Store", which could be used to add custom instructions to the CPU. The >> VAX 11/780 had it's microcode loaded from floppy at boot, but I don't >> recall if it was changeable in the same manner as the Eclipse WCS. >> > > I remember coming across the "Writable Control Store" > when reading something, and the first thing that came > to my mind was, "Boy would that create utter chaos in > even a multi-programming environment, let along a > multi-user timesharing environment." > > The systems we had didn't come with that option and so I don't know the details of using it. However, I can well imagine a need for it in specialized applications and with proper controls on who can change it and when, it shouldn't be an issue in those environments.
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