8 Oct
2007
8 Oct
'07
9:21 a.m.
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
--
Dave McGuire
Port Charlotte, FL
Farewell Ophelia, 9/22/1991 - 7/25/2007