these RTL or what?

Dave McGuire mcguire at
Mon Oct 8 11:21:45 CDT 2007

On Oct 6, 2007, at 10:49 AM, Allison wrote:
> The magical thing that really impacted logic design indirectly be
> it discrete transistors or the fastest of the fast was simply size.
> The faster the logic was the closer all the sourrounding bits had
> to be to capitalize on it.  Otherwise the rule of thumb of 1nS/ft
> took over never minding load capacitances.  Witness the Cray round
> machine (YMP?).

   Many Cray designs used that trick.  The original Cray-1 was C- 
shaped (for more than one reason I suspect!) as was the XMP family.   
Many members of the YMP family used curved segments, but only the  
earlier models.  The Cray-2 was also C-shaped.


Dave McGuire
Port Charlotte, FL
Farewell Ophelia, 9/22/1991 - 7/25/2007

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