YOU: You’re trying to get the Commodore 64 working in an emulator but you didn’t have one growing up or you don’t remember some specifics. That’s ok! Commodork is here to help you! Take it away, Rob!
Powering on the Commodore 64 places you at a BASIC prompt. Note that by simply turning the machine on, the amount of available RAM drops from 64k to 39k. Fake news!
02. ATTACHING A DISK IMAGE
All Commodore 64 emulators recognize .D64 files as Commodore disk images. In real life you would would insert a disk into your disk drive before using it. In an emulator, you must “attach” the disk. Different emulators have different ways to do this but they’re all the same basic idea. Note that each physical disk drive on the Commodore 64 had an assigned number on the serial bus, and the first one was always #8. 99% of all Commodore programs assume you are loading from drive 8, and many/most multifile programs will fail if loaded from a different drive.