Wall Street Journal has an article about Paul Allen's Computer Museum

On Thursday, August 25, 2011, Eric Smith wrote: I was part of the email conversation with Allen's team discussing this matter (before, during and after a member of Allen's team traveled to Australia to look at what was supposed to be an "IBM 7094"). One of Paul Allen's goals is to get CTSS running on a 7094. It turns out that software is available for CTSS on the 7094 and not the 7090. See: http://www.multicians.org/thvv/7094.html We discussed the possibility of converting a 7090 to a 7094 - but those of us familiar with the process said that was nearly impossible. When a customer wanted to upgrade from a 7090 to a 7094, the factory would send a team to the customer - along with a 7094 CPU. The team would then spend about a week (IIRC) rewire-wrapping the other 7090 frames that needed to modified for the upgrade. Given that just getting a 7090 or 7094 running in itself is a major effort, the additional challenge of attempting to upgrade a 7090 to a 7094 is for all practical purposes impossible. Tektronix used silver solder in their 5xx series of scopes. The reason - ceramic terminal strips - and silver binds to ceramic. I have personal experience of silver being used by the military for microwave waveguides, etc. It wouldn't surprise me to find silver used in certain military computer applications... --snip-- Cheers, Lyle -- Lyle Bickley, AF6WS Bickley Consulting West Inc. http://bickleywest.com "Black holes are where God is dividing by zero"