Perhaps my favorite fantasy console is one of the first, if not the first to exist: CHIP-8. It was originally an easy way to program video games for the Cosmac VIP hobbyist computer, but it found new life in recent years because writing a CHIP-8 interpreter is a good "babby's first emulator" exercise. It's not really capable of much by today's standards, but it goes to show that the fantasy console phenomenon has a long and deep history.