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10004Re: [midatlanticretro] All them tubes!

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  • Mike Loewen
    Oct 7, 2008
      On Tue, 7 Oct 2008, Stan Brewer wrote:

      > How many tubes were in the SAGE? The module in the photo appears to have 8
      > tubes in it, with one missing. (Perhaps 8 bits + parity?) It would take a
      > LOT to make say 16K Bytes of storage.

      Numbers vary, but generally over 50,000. The large PUs like the one in
      the photo could take up to 9 tubes, while smaller PUs held up to 6.

      > Everybody, Back in the good ole days, tube computers, because of the
      > requirement for so many tubes, were down almost as much as they were up.

      The SAGE system as a whole had over 99% availability, where at least
      one of the duplexed systems was operational. Each system was completely
      powered off only ONCE a year for annual maintenance.


      Mike Loewen mloewen@...
      Old Technology http://sturgeon.css.psu.edu/~mloewen/Oldtech/
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