They had pretty good tech for the day. I saw a vidio on how they stored numbers it was a grid of fine metal wire with individual loop over the intersection. Some very, very smart people worked with what they had.

I've read and I belive that we can't make the Saturn 5 jet engines that the used back in the day. Our modern tech isn't equal to the skill and brains of the men who built it.

Edit

https://www.youtube.com/watch?v=6mMK6iSZsAs

This guy has a bunch of vidios on the topic, even several interviews with the men who built and used these systems.