This is less of a “how to mod up Color 64” and more of a LPT.
If you have JiffyDOS type this:
Save it as ^ (that’s the up arrow) on your main disk you will be editing from.
BONUS: Be a real badass:
Make sure baid64 is on the disk you are booting to and add this line:
Now all you need to do to make the display not burn your retina AND get right to coding is just type “^^” after the system boots!
If you want to be fancy, just set ^ as the screen changer and create a new file with Baid64 in it called ^^. So then you can boot and type ^^ or ^^^ and others will think you are enlightened.