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Author:  JamesGifford [ Sat Nov 03, 2012 6:59 am ]
Post subject:  Re: Bureaucracy

PeterScott wrote:
I don't think Dan's example makes the point. The shuttle architecture is the result of relatively state-of-the-art design being frozen many years before implementation, and that was the late '70s. Whereas I am saying that you can look at current IT projects and services in government and see that they're 5 years behind the private sector.

No, I understood that point. The point's point is that hardware for spacecraft not only have to pass whatever validation tests they'd need to for ground use, but an additional suite of tests for orbital use. I don't need to tell you how long such testing can take, not when NASA insists on 'no bit left behind' standards. So yes, the computers in the first-gen shuttles were five years behind ground tech... because they were the latest tech that could be approved at that time for orbital use. I've read articles about how the successive upgrades were each four to five years behind ground tech for that reason.

Author:  DanHenderson [ Mon Nov 05, 2012 10:47 am ]
Post subject:  Re: Bureaucracy

JamesGifford wrote:
At the time the Shuttle was flight-ready, there were no memory chips that were guaranteed safe against high-energy radiation.

How well were the hooman beans on board expected to do in a blast of high-energy radiation?

The Grid Compass laptops used bubble memory. I have no clue how resistant to radiation those were.

Author:  JamesGifford [ Mon Nov 05, 2012 11:39 am ]
Post subject:  Re: Bureaucracy

DanHenderson wrote:
How well were the hooman beans on board expected to do in a blast of high-energy radiation?

The issue wasn't a burst of solar or cosmic radiation, but the relatively sparse high-energy particles that are present all of the time outside the atmosphere. Whatever damage those might do to humans is very long-term compared to the instant death of a silicon memory cell.

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