Trademark Acknowledgments:
· OPTI is a trademark of OPTI Incorporation.
· IBM is a trademark of International Business Machines Corporation.
· Sound Blaster PRO and Sound Blaster are trademarks of Creative Lab Inc.
· MS-DOS and WINDOWS are trademarks of Microsoft Corporation.
1. Introduction

This Model # 2321 OPTI 931 &  Model # 2326 OPTI 931+3D Audio Controller 
is a 16-bit Full Duplex sound card based on the OPTi 82C931 Full Duplex 
Plug-n-Play Integrated Audio Controller Chip.  

The OPTI Sound Card is available in two versions. The standard version 
Model # 2321 OPTI 931 is a 16-bit Full Duplex sound card whereas the 
Model # 2326 OPTI 931+3D comes with a built-in ‘3D’ features which is 
always enable. It adds hardware and software 3D sound effect to any 
audio signal, whether it is from an audio CD, MIDI or Wave file.

The OPTI 931/OPTI 931+3D Sound Card will let you run thousands of Sound 
Blaster and Sound Blaster PRO compatible games and applications, 
including a rapidly growing number of Windows business applications 
that are compatible with the Windows Sound System.

Included with full support for these PC popular sound standards, the 
OPTI 931/OPTI 931+3D includes audio cable interface for CD-ROM drives. 
Also, it has multiple input and output ports for recording and playback 
of stereo sound.


1.1 The OPTI 931/OPTI 931+3D Sound Card Features
The OPTI 931/OPTI 931+3D is a fully featured sound card which includes 
the following :
· 16 bit full duplex plug & play stereo sound
· 22 voice 52 operators FM Music Synthesizer
· Integrated 16-bit A/D and D/A converters
· Maximum sampling rate up to 48KHz for stereo recording and playback
· 7 channel mixer - 5 stereo & 2 mono
· Software volume control for both record and playback
· Built in 2 watts per channel stereo power amplifier
· Connector for Mic in, Line in, Line out/ Speaker out, Wavetable & 
  ATAPI IDE Interface
· Game port for joystick or MIDI device
· Plug and Play Features 1.0a
· Optional built-in ‘3D’ features (Model # 2326 only)
 
1.2  What is in your package ? 

You should have the following items in your package :

· Model # 2321  OPTI 931  or   Model # 2326  OPTI 931+3D Sound Card
· MMCD CD-ROM containing all drivers, utilities and manuals
· Hardware Installation, product layout & troubleshooting manual


2.  Installation

Jumpers and Connectors Description 

J1	IDE Connector  (set default as disable; can enable by software)
J2	Wavetable Connector
J3	CD-ROM Drive Audio Cable Connector
J4	MPEG-IN
J5	Game Port Connector
AJ2	Speaker Out/ Line Out Connector
AJ3	Line In Connector
AJ4	MIC In Connector

JP2 & JP3 : 
2-3 = Enable on board amplifier	(AJ2 = SPEAKER OUT Connector)
1-2 = Disable on board amplifier(AJ2 = LINE OUT Connector)

Note :    i) The factory default setting is 2-3
	 ii) Uses 2-3 setting - when connect the sound card to normal 
             computer speakers
	iii) Uses 1-2 setting - when connect the sound card to self-power 
             devices (e.g. Hi-Fi system, amplifier)


2.1  Hardware Installation

Note that if your system is not PnP compatible, the default configuration 
is as follows:

Operation Mode	Sound Blaster Pro Compatible
IRQ			5
DMA Channel		1
I/O Port Address	220h
CD-ROM Interface	None


2.2  Software Driver Installation
2.21  DOS & Windows 3.1 Driver Installation

1. Insert the MMCD in to your CD-ROM drive and run the MMCD program. 
   Go to the Opti931 page and click on the Windows 3.1x Driver button 
   under the ‘Install’ section.  The driver will load automatically.
2. The driver installation program will appear.
3. Click on the ‘NEXT’ button to begin installation. 
4. You will be prompted to select a drive and directory. The default 
   is C:\ OPTI931.
5. Press ‘NEXT’ , the installation program will begin. 
6. When the files are copied, reboot your computer system and Driver 
   Installation is completed.

Note : If your system does not support Plug & Play, you will have to 
make your configuration settings under the ‘Configuration & Sound-Test’ 
menu. But if your system supports the Plug & Play 1.0a specification, 
most of these settings will not be user selectable.

2.22 	Windows 95 Driver Installation
 
 
Note : Install the Sound Card into the motherboard only after the 
Windows ‘95 has already  installed into the new HDD of the new system, 
then restart the system and follow the procedure below..

1. Install the Sound Card on the motherboard, and power on the system.
2. Windows ‘95 will automatically detect the sound card.
3. Select the "Driver from disk provided by hardware manufacture"  
   and direct Windows to the location of the Windows ’95 driver - 
   app\product\3\win3195\
4. This will complete the Windows ‘95 installation.