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.
Play catch with the PET, says the flyer. CATCH! is simple: the PET sends a ball across the screen along a random trajectory and you have to intercept it with your block. I found this one frustrating but hard to put down. The ball is difficult to catch; a score of 3 out of 10 was about the best I could manage.