Core was ram wasn't it?
Anyway, I used to do uni teaching about 4 years ago. The practical course I helped run involved programming with a whole 64 actual bytes of RAM (you want k, rich boy?). Rather more modern, but as usual the constraints are about cost and power draw but at the fractions of a cent and nano watt level.
Resource constrained programming hasn't gone away, it's probably bigger now than it ever was, but it's very well hidden.
I think it was a PIC12F675 or maybe a 10F series one. I don't recall precisely.
Of course you get a much faster machine to run the editor, assembled simulator and debugger.
I really came to appreciate those chips. The dedication of the builders to shaving cost and power while making the absolute most of the few transistors they were willing to use is impressive!