Reproducing old machines with newer technology

Paul Koning paulkoning at
Tue Jul 14 15:35:36 CDT 2015

> On Jul 14, 2015, at 3:55 PM, William Donzelli <wdonzelli at> wrote:
>> ...I/O processors.
> I do not think you can claim that the 6600 I/O processors were all
> that new. Many (most?) of the 1960s mainframes before the 6600 had
> channel controllers.

Sure, but channel controllers and PPUs are very different beasts.  You can’t run your OS on a channel controller, which is exactly what Cray did on the 6600.  Nor can you implement the entire operator user interface on a channel controller, as was done in the DSD PPU program.


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