[DirectX 8.1 C/C++ Programmer's Reference] Gain (39.8013750954927%)

DirectX 8.1 (C++) > DirectInput > Using DirectInput > Force Feedback

[DirectX 8.1 Visual Basic Programmer's Reference] Gain (39.8013750954927%)

DirectX 8.1 (Visual Basic) > DirectInput > Using DirectInput > Force Feedback

[DirectX 5 Programmer's Reference] Gain (38.7987012987013%)

DirectX Foundation > DirectInput > DirectInput Essentials > Force Feedback

[DirectX 6 Programmer's Reference] Gain (38.7987012987013%)

DirectX Foundation > DirectInput > DirectInput Essentials > Force Feedback

[DirectX 7 Programmer's Reference] Gain (38.7987012987013%)

Microsoft DirectX 7.0 > DirectInput > DirectInput Essentials > Force Feedback