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.
Taito released the original Space Invaders arcade game in 1978, and as a high school student Satoshi Matsuoka created a masterpiece replica of Space Invaders for the Commodore PET in 1980.
Taito updated the original arcade game in 1979 with the release