Im sure a Raspberry could do it now. Pretty cool. I’d like to look at the code they are running.
A Raspberry Pi would run rings around this.
The latest RPi3 has a 1GHz CPU. It's actually 64-bit, but there's only one distribution that I know about that will run it in that mode. Raspian (a derivative of Debian) is still 32-bit.
The C-64 had a 1-MHz CPU. No, that's not a typo -- it was a full 3 orders of magnitude slower than the RPi 3. And, it was an 8-bit processor. With no floating point.
The RPI3 also has WiFi, USB, HDMI, and a number of other capabilities that didn't even exist when the C-64 was built.