Changing the size of memory or changing the ROM version forces a reset of the PET.
The emulator has an IEEE-488 device at address 8. It can be used load and save (.prg) files.
Some programs don't run on ROM1 and some require more memory than the default 8K.
FACE is a little software toy where you can have the PET generate some random PETSCII faces, or you can select eyebrows, eyes, noses, and mouths from a series of menus and make your own face. The program reminds me a bit of later programs like Commodore's Home Babysitter or Facemaker from Spinnaker.