It uses "vapor lock" (the floating bus) plus careful cycle counting
to show text, lores, and hires graphics at the same time, plus
play mockingboard music if available.
Video capture on my Apple IIe platinum. The capture card has some issues,
including some sound lag:
Screenshot
Picture of it running on Cooper's super-fancy Apple IIe at Kansasfest 2018.
This took some finessing the buttons until lo-res page2 wanted to display
properly.