Pentium II, 400 MHz, 600 MHz recommended.  128 MB RAM, 384 recommended for best play.  DirectX 8.0 compatible, or DirectX 8.1 compatible (recommended for best play) sound and video cards with Windows 98SE, ME, 2000, and XP drivers.  Joystick, mouse and keyboard. Throttle and Rudder pedals are recommended. Several manufacturers make models of their flight control systems for the PC. 
14.4K or faster connection to the Internet. To connect via PPP/SLIP/LAN, you must have Windows' Dial-up Networking and TCP/IP drivers installed (included with Windows).  16 MB 3D card.  Recommended 3D cards: ATI Rage 128  ATI Rage Mobility 128  ATI Radeon  Matrox G400  NVidia GeForce 256  NVidia GeForce 2MX 
NVidia GeForce 2  NVidia GeForce 2 Ultra 
NVidia Quadro  NVidia Quadro 2 Pr0  PowerVR Kyro II  As more 3D cards receive drivers compatible with DirectX 8 we will expand this recommended list.