Toshiba Infinia 7130 Series Maintenance Manual page 207

Audio Subsystem
The Infinia™ Models 7130, 7160, 7161, 7200, 7201, and 7220 system boards feature a 16-bit
stereo audio subsystem. The audio subsystem is based upon the Yamaha YMF701 OPL3-SA
FM synthesizer. The OPL3-SA provides all the digital audio and analog mixing functions
required for recording and playing of audio on personal computers. These functions include
stereo analog-to-digital and digital-to-analog converters, analog mixing, anti-aliasing and
reconstruction filters, line and microphone level inputs, and digital audio compression via
selectable A-law / µlaw, and full digital control of all mixer and volume control functions.
Yamaha OPL4-ML
The Infinia™ Models 7200, 7201, and 7220 system board also features the Yamaha OPL4-
ML wavetable. The OPL4-ML is a ROM table containing live instrument sound samples.
Wave synthesis results in richer and more realistic sounds than that of FM synthesis. If the
OPL4-ML option is not installed, a wavetable upgrade connector header (J1F1) is installed
allowing use of an ISA bus add in wavetable card.
SRS
The Infinia™ Models 7130, 7160, 7161, 7200, 7201, and 7220 system boards feature an SRS
Labs, Inc. Sound Retrieval System (SRS), a patented and licensed audio circuit that creates
3D spatial sound from conventional mono, stereo, or surround sound, using only two
speakers. This is achieved by summing portions of the right channel audio into the left and
vice versa, and does not require signal encoding/decoding, time delay or phase shift of the
audio signal. The resultant effect is the creation of virtual speakers, which expands the audio
image, creating a 3D sound experience, and eliminating the speakers as discrete point audio
sources.
Resource
Sound Blaster
(SB DMA playback, DMA shared
with Windows Sound System
Capture)
Windows Sound System
(DMA playback)
MPU-401
(IRQ shared with Sound Blaster)
FM Synthesizer Port
Game Port
* indicates default setting
Audio Drivers
Audio drivers for OS/2 2.11 and OS/2 WARP, Windows 3.11, Windows 95 and Windows NT may be
downloaded from the Intel Applications Support BBS or the world wide web (http://www.intel.com). Also
available is a Windows 95 task bar icon, SRS, which allows the us e r to enable/disable surround s o und audio
without accessing the Setup program .
Table E-1 Audio Resource Mapping
Interrupts (Options)
10* (5, 7, 9)
7* (5, 9, 10)
11* (7, 9)
10* (5, 7, 9)
DMA (Options) I/O (Options)
0* (3) 220h (240h)
1* (3) 530h* (604h,
E80h, F40h)
0 330h* (300h,
332h, 334h)
388h
201h