Re: Operating systems used in spacecraft?

[EMAIL PROTECTED] (Derek Lyons) wrote in message news:<[EMAIL PROTECTED]>...
> [EMAIL PROTECTED] (Christopher M. Jones) wrote:
> 
> >The Space Shuttle uses different
> >control systems which back each other up but the software is very,
> >very closely related to each other (the backup is a stripped down
> >version of the original) and it all runs on the same hardware.
> 
> Um, no.  The BFS and PASS are utterly unrelated other than the share
> the same set of basic specifications and run on common hardware.

Correction noted.  Though, as you note, they are very similar in that
they are "low level compatable" by design in a way that would be
difficult for any usual choice of hardware / software infrastructure
(processors, busses, OSs, etc.)  Besides which the budget for
development of the Shuttle software is roughly two or three King's
ransoms, give or take.