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.
LOT! is a slot machine game. The machine is drawn quite effectively with PETSCII, although the reels show the names of the fruits rather than interpreting them in graphics characters. The gameplay is simple: place your bet, watch the reels come to rest, and collect your winnings (or go further and further into debt.) You don't have a wallet or tokens; the game will keep track of your score, showing you how far ahead or behind your money total is.
The slot machine is supposed to be completely fair, with no advantage for the house. The author believes that in the long run, you should come out even, but I wouldn't be surprised if there's a slight bias in favour of the player. Because you can go as far into debt as you like, you can essentially play forever without getting kicked out of the casino.