Digital Monster Ver. S has never been released for PC, so it has no PC system requirements. It came out on SEGA Saturn. Released in 1998.
There is no emulator for SEGA Saturn that this site will point you at.
Platforms: SEGA Saturn.
System requirements for the game Digimon Masters Online
System requirements for the game Digimon Survive
System requirements for the game Digimon World: Next Order
System requirements for the game Digimon Rumble Arena
System requirements for the game Digimon World 3
System requirements for the game Digimon World 2
System requirements for the game Digimon All-Star Rumble
System requirements for the game Digimon World 4
