MediaForte SF256-PCP, Руководство пользователя

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User Manual
What are DMA Channels and PCI?
Under Windows 9x, the SF256-PCP PCI Sound card is capable of
full duplex audio. This means that the card can playback WAV file
and record another WAV file concurrently. With the PCI bus, full
duplex is possible without any DMA channels.
To test full-duplex yourself, try the following steps:
1. Launch the Sound Recorder as shown below:
2. Launch another session of Sound Recorder.
3. Use one of the Sound Recorder to play any WAV file (select
a long WAV file).
4. Use the other Sound Recorder to record your voice through
a microphone.
5. If both works, your sound card support full-duplex.
There is no microphone support in the MS-DOS Mode and
therefore only a single DMA is required for legacy emulation.
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