DOOM II RPG has never been released for PC, so it has no PC system requirements. It came out on iOS. Released in 2009.
There is no emulator for iOS that this site will point you at.
Platforms: iOS.
System requirements for the game DOOM (2016)
System requirements for the game DOOM Eternal
System requirements for the game Doom 3
System requirements for the game DOOM II
System requirements for the game Ultimate Doom
System requirements for the game Final DOOM
System requirements for the game DOOM
System requirements for the game Doom 64
