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.
AHTZEE is, not surprisingly, an implementation of the dice game Yahtzee. The main game screen is well designed: the scorecard layout is clean and the PETSCII dice look good. I found the re-rolling input procedure a little counter-intuitive but quickly got used to it. I also had to get used to the reality that the random number generator absolutely hates me. I couldn't roll a single Yahtzee over the course of several games, which I guess makes this version a fairly realistic simulation.