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echo: tech
to: Neall Mercado
from: Charles Angelich
date: 2003-02-12 22:34:10
subject: Columbia`s `computers`

1237a5af31b8
tech



Hello Neall - 

CA>> sites agreeing that the Columbia was, in fact, using the
CA>> 8086 CPU and - get this - 400k _total_ program code.
CA>> Honest! The four main computers were sync'g using software
CA>> and not hardware (how smart!). No info on the fifth backup
CA>> computer but it was setup using different software than
CA>> the other four and I suspect was equipped with the earlier
CA>> 1805 CPU? 

NM> The spacecraft's computer is that old because of the
NM> quality assurance testing. They took many years of testing
NM> and fail-safe checking that system to make sure of the
NM> safety measures before taking that craft to space. 

The Columbia design was 30 years old, the machine itself was 22
years old. If you're trying to convince me it took that long to
test an 8086 program - forget it. No way, no how. 

NM> Do you like the risk of putting a non-tested WindowsXP
NM> system with Pentium IV computer installed on the new space
NM> mission? 

No OS that you know of is ever going to control a space
shuttle. What you have access to is written to be 'cute' and
sell to semi-literates. What the shuttle would use would be in
the embedded field comparable to what is used in operating
rooms for heart surgery. ;-) 

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