The CP/M computers had 64 KB addressable. That's the total of the data+instruction L1 cache on each core. I've used WordStar on a machine with 64 KB addressab

The CP/M computers had 64 KB addressable. That's the total of the data+instruction L1 cache on each core. I've used WordStar on a machine with 64 KB addressable, which was as WSIWYG word processor as possible on the text monitor with 80x25 characters. It showed you all the possible actions in each step too -- what even today so many programs don't manage to do. If I remember it didn't keep the whole program in the RAM at once, but had its own swapping mechanism. I've also used a Turbo Pascal there, which was even on such a machine amazingly fast. By default the compilation was directly to memory, no waiting on any disk.