Yes, I recall being aghast when I saw teh movie Apollo 13 & learned how small the computer was that ran the entire craft
They say that today's cars have many more computers than even the Apollo spacecraft. Still though, it is amazing what they accomplished with the same amount of memory (4K) that an early personal computer or a run of the mill Atari 2600 cartridge had although in that case, the cartridge was ROM memory. I was quite amazed at Atari programming "Adventure" in 4K but when you think that the same amount of RAM was used to go to the moon, that is many times even more spetacular. Come to think of it, the Apollo's computer ran almost half the speed as an Apple ][+ or //e.
Read about it here:
Wikipedia on the Apollo CSM Computer