darn you this stuff is interesting. http://www.colorforth.com/install.htm - THIS guy made a pin compatible TI99A (and other systems) graphics chip which is programmable using a Forth variation he invented he called “colorForth”. You program in COLORS.
I downloaded the version he puts on his site for the chip and I was all smiles. I had to go out for the day but all I could think about was getting back to understanding this stuff. A language where YOU DEFINE how functions like “IF” might work really changes things.