Technical Information 1-31
The audio subsystem requires up to two DMA channels and one IRQ. Table 1-15 shows the
IRQ, DMA channel, and base I/O address options. These options are automatically chosen
by the Plug and Play interface, so there are no default settings.
Table 1-15 Audio Subsystem Resources
Resource
IRQ
(Options)
DMA Channel
(Options)
I/O Address
(Options)
Sound Blaster
(DMA playback, DMA / IRQ
shared with Windows
Sound System capture)
5 (best choice)
7
10 (best choice)
11
0 (best choice)
3
210-21Fh
220-22Fh (best choice)
230-234h
240-24Fh
250-25Fh
260-26Fh
Windows Sound System
(DMA playback)
5
7
10 (best choice)
11
0
1 (best choice)
3
534-537h (best choice)
608-60Bh
MPU-401
(IRQ shared with Sound
Blaster)
5 (best choice)
7
10 (best choice)
11
300-301h
330-331h (best choice)
332-333h
334-335h
MIDI
200-207h
FM Synthesis
388-38Dh
CS4236B Control
FF0-FFFh
The system board audio connectors include the following:
Rear panel connectors (Line In, Line Out, Mic In)
CD-ROM audio (ATAPI and 2 mm)
Telephony (ATAPI-style)
MIDI/Game port header
Line In (ATAPI style).
See Appendix A for the audio subsystem’s connector pin assignments.