Microsoft developed the PC-99 specification to define consistent architecture and performance requirements for Windows-based PCs. Chapter 17 of the specification deals with audio requirements. The PC-99 audio specification covers:
- Audio system requirements;
- Audio performance and feature requirements;
- Advanced audio recommen-dations.
The PC-99 document specifically defines minimum performance requirements for frequency response, THD+N, and crosstalk. It defines system requirements such as nominal signal levels and input impedances as well. The specification covers physical interfaces, like the type of connectors and connector color-coding for interfacing the audio with the outside world. To obtain the PC-99 specification online, visit www.microsoft.com/hwdev/pc99.htm.
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