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.
MORSE! is a drill program for practicing Morse code. The student sets the transmission speed at the beginning of each session; I know no Morse code aside from SOS, so I set the speed as slow as possible, which was helpful. This program uses CB2 sound effectively, with short and long tones corresponding to the dots and dashes that make up the Morse-code representation of each character. While this program is okay for learning Morse code—in the short time I played with it, I learned a handful of numbers and the letter 'L'—I think it is more useful as practice for someone who already knows the system and wants to get better at it. To learn from scratch, I'd want to see a graduated system where letters are introduced a few at a time, and the ability to practice on real words instead of random strings of characters. Unfortunately, there's not enough memory on the 8K PET to add these features to the program.