http://history.nasa.gov/sts1/pages/computer.html its most defect-free code Advanced Vehicle Automation and Computers Aboard the Shuttle http://history.nasa.gov/sts1/pages/computer.html http://history.nasa.gov/sts1/pages/computer.html originally designed Advanced Vehicle Automation and Computers Aboard the Shuttle http://history.nasa.gov/sts1/pages/computer.html http://history.nasa.gov/sts1/pages/computer.html five processors cranking at 0.4 MHz each trojan five processors cranking at 0.4 MHz each