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.
DBOOK is a simple database program for storing names and dates (such as birthdays and anniversaries.) User interaction takes place through a clumsy command-line interface and the validation is weak—the PET will happily accept November 31 as a date. Saving and loading date books requires a datasette.