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.
Lode Runner was an amazing game .. and available on pretty much every major 8-bit platform except for the Commodore PET. Forty years on, I took a crack at creating Lode Runner Clone for the PET and here it is. Tested on PET/CBM models 3032, 4032 and 8032.