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PSX version

Runs fine on emulators. Also runs on real hardware, but you'll need a modded system that allows running region-less and unlicensed games.

Windows version

OpenGL variant supports everything from Windows 95 / Windows NT 4.0 and up. Requires an OpenGL implementation, be it software (Microsoft's OPENGL32, for example) or hardware (3dfx Voodoo works amazingly).

Software renderer only needs a VGA-capable card. It works on Windows 3.1 with Win32s installed as well as DOS with HX DOS Extender (you will need crtdll.dll from a Windows 95 install, though). Make sure your display is set to 256 colors for best performance. For even better performance, pick the DOS version.

Requires an 486 or better CPU, 4 MB of RAM and a CD-ROM drive.

DOS version

Works on pretty much anything from DOS 3.30 and up. This includes MS-DOS, DR-DOS, OS/2 2.x, Windows 3.1 in 386 enhanced mode and Windows 9x/ME et cetera.

Requires a 486 or better CPU, 4 MB of RAM, a VGA graphics adapter and a CD-ROM drive.