darn you this stuff is interesting.
  *[1]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.

References

  Visible links
  1. http://www.colorforth.com/install.htm