Path: utzoo!attcan!uunet!convex!schumach@convex.com
From: schumach@convex.com (Richard A. Schumacher)
Newsgroups: comp.arch
Subject: Re: ETA10 (was Re: Surges)
Message-ID: <3266@convex.UUCP>
Date: 21 Nov 89 00:19:48 GMT
References: <3217@convex.UUCP> <5290@internal.Apple.COM> <7043@pt.cs.cmu.edu>
Sender: news@convex.UUCP
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The LN2 cooled the chips by boiling, not by conducting away the heat.
The resulting vapor was then recondensed and re-used (at all user sites) or 
just thrown away (at the manufacturing facility). It turned out that at
about $0.25/liter it was cheaper just to throw it away, rather than pay
electricity costs, amortized capital cost, etc., for the closed system!
(Most customers realized this and wanted an open system, but ETA dithered 
over it for two years or so...)