Ultima: Runes of Virtue has never been released for PC, so it has no PC system requirements. It came out on Game Boy. Released in 1991.
Running Ultima: Runes of Virtue on a computer
There is no emulator for Game Boy that this site will point you at.
Games of the same series that run on PC
Underworld Ascendant
Ultima IX: Ascension
Ultima VIII: Pagan
Ultima VII Part 2: Serpent Isle - The Silver Seed
Ultima VII: The Black Gate
Ultima Worlds of Adventure 2: Martian Dreams
Where Ultima: Runes of Virtue can be played
Platforms: Game Boy.
