To get to the moon, a computer really has very little to do. Adjusting the jet nozzles 10 times a second or so was well within the capabilities, and there was no need for gigabytes of maps and the like; once the pod was on it's way, it could hardly get lost. The environmental controls and so on would be seen to at the hardware level by their own independent systems, so it's not like the computer would need to coordinate 1000 different subsystems.