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.
TITRATE is a titration simulation that plays out a bit like a timing game. Use the keyboard controls to mix solutions and get an indicator to change colour. Go too far, and you ruin the sample. The PET will rate your performance, and if you take too long, it will chide you for being slow. A real scientist would probably prefer carry out titrations in a slow, deliberate fashion so as not to waste samples, but then most scientists don't have have to answer to the PET for their performance throughput.