If that was what NASA was making do with just imagine what the Russians were doing. The story I heard was that most of their guidance and flight control systems were simple clockwork mechanisms,and rather than spend millions developing pens that work in zero gravity they used pencils, but that might be an urban myth.
When I started programming our first lab computer in the 70s, each user had a 2kb of memory, with a total of 32kb in the machine. More than 20 people could use it simultaneously though, as the operating system simply switched out dormant jobs to disk. It could handle very complex tasks but the difference was no fancy user interfaces, thats what eats up the memory and processing power.
Oh, and to all those who think the moon landings were faked, do you really think the Russians didn't track within a few metres exactly where the US spacecraft were. Would they have kept it to themselves if they were picking up the moon broadcasts from the direction of the Mohave desert rather than the moon? I don't think so.