Commodore has set up a microsite to help steer you towards its unique vision of a modern operating system. If you head over to commodore.net/closewindows, you will first see a banner image of the Commodore 64X PC with OS Vision. But that is essentially an x86 PC in a C64-style ‘bread bin’ chassis, so don’t worry about the hardware.
I never owned a Commodore. I didn’t know they had cartridge games. At the time, my family owned a TI 99/4a. I think it did have a cartridge, but the BASIC one just stayed in there. We didn’t have anything else. I hand-typed in games from Compute! magazine and saved em on tape drive. Lotsa debug involved.
The c64 actually did have game cartridges, but be it tape, cartridge, floppy, cd - in the emulation space, ROM (Read-Only Memory) just generally means the file with the game data no matter the medium.
But technically, it’s a ROM only if it truly is a dump of an actual ROM chip.