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.
SPOT is a computerized version of the board game Connect Four for two human players. There's no way to play against the PET, which is a missed opportunity for this program. The game of Connect Four has been solved, although there's no way a brute-force solution could fit in the PET's limited RAM. I'd be interested in knowing whether a moderately strong opponent could be programmed to fit in 3K of free RAM that SPOT has to work with.