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.
GAMMON lets you play backgammon against the PET. The board display makes excellent use of minimalistic PETSCII graphics. The program requires 16K of RAM, so don't expect to run it on the original 8K PET 2001. A significant portion of that 16K is used up by the game's instructions—there are a lot of screenfuls of instructional text.