I should post this to Pascal rather than development resources, but I'm too lazy.
eXecute the MODCOL program on disk 712a before running the binary tree sample (TURTTREE or TURTTREE1) in the Turtle graphics library. Without, it's black on sky blue and a great example of bitmap graphics. With, it's all kinds of colors on black. Excuse me, while I kiss the sky.
If helpful I can post my steps. Again, just seeing how far I can push the emulator. Turns out, pretty far.
@tursi == creator_of_universes But I know it's > @tursi and I thank you all.