A mainframe computer was used for guidance and navigation for the Apollo 13 mission in 1970. This was a critical component, as the mainframe was responsible for calculating the trajectory, firing the engines, and guiding the spacecraft. Without it, the astronauts would not have been able to return home safely.

The mainframe computer for Apollo 13 was a Control Data Corporation 6600, which was a large and powerful machine. It had a storage capacity of 8 million words, which was more than enough for the needs of the mission. The computer was also able to handle the large amounts of …