[DirectX 2 Programmer's Reference] Software Emulation (35.5808080808081%)

DirectSound > Overview > Object Types

[DirectX 3 Programmer's Reference] Software Emulation (34.1919191919192%)

DirectSound > DirectSound Architecture > Object Types

[DirectX 5 Programmer's Reference] Software Emulation (29.0700483091787%)

DirectX Foundation > DirectDraw > DirectDraw Architecture

[DirectX 6 Programmer's Reference] Software Emulation (29.0700483091787%)

DirectX Foundation > DirectDraw > DirectDraw Architecture

[DirectX 7 Programmer's Reference] Software Emulation (27.8795721187026%)

Microsoft DirectX 7.0 > DirectDraw > DirectDraw Architecture

[DirectX 5 Programmer's Reference] Software versus Hardware (27.3071184995737%)

DirectX Foundation > Direct3D Immediate Mode > Direct3D Immediate-Mode Essentials > Performance Optimization