The Apollo Guidance Computer system was designed for the Nasa Apollo space programme. It was first used in 1966, and within three years helped Neil Armstrong and Buzz Aldrin reach the surface of the Moon. With only 74KB of memory – less than a ONE page WORD document – it was able to control a 13,000kg spaceship, orbiting at 3,500km/h around the Moon, land it safely and return it back to Earth.
The so-called Apollo Guidance Computer (AGC) used a real time operating system [...] was more basic than the electronics in modern toasters that have computer controlled stop/start/defrost buttons. It had approximately 64Kbyte of memory and operated at 0.043MHz.