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Space shuttle cockpit
The shuttle features four onboard computers running the same software on different hardware, which together check each other's work. A fifth backup computer runs an entirely separate system in the event the other four fail.
In 1990, Nasa upgraded the computers, raising the memory 2.5 times to 1MB.
From 1999, 'glass cockpit' technology was added to the orbiters, providing more up-to-date display screens on the flight deck.
Photo credit: Nasa