Forth was the revolution back then. I remember seeing a demo of a user-written Forth program running real time 3d wire frame animation on an Apple II. In those days, that was quite a deal. Then, the only alternatives were, you could run the same program at 1/20th speed in BASIC, or spend half a year writing it in assembler.
I had a TI9914 graphics card grafted on to my OSI Superboard II 6502 machine, wrote a Forth display library for it. It rocked.