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.
The game **3D Os & Xs** is a lesser-known title from the early days of personal computing, specifically associated with the **Commodore PET**. It is a three-dimensional version of the classic tic-tac-toe game, designed to challenge players in a more complex spatial environment compared to the traditional 2D version. The game was likely created during the late 1970s or early 1980s, a period when developers were experimenting with 3D concepts on limited hardware.