                    OPTi 82C925 Windows 95 Drivers
                            Version 4.00.24 
                                08/01/96

UPDATE
    This version has been updated from 4.00.23 with the following changes:
    - Fix Repeat Stop and Record Noise Problem with AD1845 Codec.

INSTALLATION PROCESS

    If you do not have a previous copy of the drivers installed, and 
    you are installing this Sound Card plus Driver package for the
    first time, you may proceed to the FIRST TIME INSTALLATION section. 
    However, if you are updating your previous installed drivers, you 
    MUST follow the UPDATE PREVIOUS DRIVERS section below in order to 
    succesfully install the new drivers.

    UPDATING PREVIOUS DRIVERS

    [Updating "OPTi Plug-N-Play Sound System" Driver]

    1. You should have the latest drivers on a floppy diskette ready
       for installation.

    2. Start Windows 95 and proceed to the Control Panel folder and 
       select (double click) the Add New Hardware icon. This will 
       add/update the OPTi Sound Device and it's associated drivers.

    3. When prompted by Windows 95 for the Auto-Scan option for 
       detecting new devices on your System - select NO and proceed
       to the next page.

    4. Windows 95 will display a list of known devices that you 
       currently wish to install. Select "Other Devices" eventhough
       the name of the device is included in the list. This forces
       Windows 95 to perform a fresh install for your device. Select
       Next to proceed.

    5. Windows 95 will again display a list containing manufacturer 
       names and at which point you should ignore the list and select
       the "Have Disk..." button. This tells Windows 95 to read
       special installation instructions from your diskette to 
       correctly install the drivers for your OPTi Sound device.
       You will have to direct Windows 95 to the proper location of 
       the floppy diskette.

    6. Once information from the floppy diskette has been read by
       Windows 95, a list of devices available for installation will
       be displayed. This list contains driver setup options pertaining
       to your Sound Card's capabilities. For example, if your Sound
       Card has an IDE CD-ROM interface which you wish to connect your
       IDE CD-ROM to, select the appropriate option to enable this
       setup. If your Sound Card does not contain any options other
       than Audio functions, then just select the first option.

    7. Windows 95 will now proceed to install the drivers needed for 
       your device and configure your device accordingly. Once your 
       device has been successfully configured, Windows 95 will prompt 
       you to restart your system - select Yes for the new drivers to 
       take effect. YOU MUST REBOOT for the changes to take effect!



    FIRST TIME INSTALLATION
    
    Install the Sound Card into your system and reboot your machine; 
    Windows 95 should detect new PnP resource on your Sound Card and
    prompt you for the installation files. At this point, insert the
    OPTi 82C925 Windows 95 Driver diskette into your floppy drive and 
    let Windows 95's Device Manager direct you through the installation
    of the drivers.

    When Device Manager finds a new device but cannot determine/find the
    correct driver for the device, it will prompt you for the location 
    of the drivers associated with the device and will expect that the
    drivers are from a floppy diskette. At this time, select OK if the 
    option "Drivers from disk..." is enabled and Device Manager will 
    proceed to copy the drivers from the diskette. However, if the option 
    "Windows Compatible Driver" is enabled, select OK as well to direct 
    Device Manager to make use of default drivers for that particular 
    device.



RECONFIGURATION OF RESOURCES

    The OPTi 82C925 device is a fully Plug-n-Play device and all it's
    resources should be reconfigurable on-the-fly unless due to a
    similar conflicting device present in the system.

    To reconfigure the resources, use the SYSTEM icon located in your
    Control Panel folder and choose Device Manager. From Device Manager,
    double click the "OPTi Plug-N-Play Sound System" option and the
    list of installed OPTi Audio devices will be displayed. Double click
    on the device which you wish to change resources for. Once resources
    have been changed, the driver will be automatically reconfigured to 
    operate with the new resources and function as before.



AUDIO SUPPORT under REAL MODE DOS

    REAL MODE DOS Support is handled in "COMBO" package only. Please 
    obtain this package to support this option.



AUDIO SUPPORT under WINDOWS 95 DOS BOX

    DOS Game support has been added for this release and is fully 
    functional. During the setup for your DOS games, you must ensure that
    the current resources assigned to the sound card matches with the
    current settings requested by your DOS game. To find out what resources
    are currently assigned to the sound card, proceed to open the properties
    box associated with the "OPTi Plug-N-Play Sound System" (Device Manager)
    and select the Resource tab. From the Resources box, you should see the
    current I/O Address range for Input/Output Range Number 1. We recommend 
    the 220 Hex address range as opposed to the 240 Hex be selected as most 
    games support 220 Hex by default. We also recommend the Interrupt and 
    Direct Memory Access settings of 7 and 1 respectively. Reconfigure these 
    resources as appropriate and select OK for Device Manager to dynamically 
    change and update your current resources and configure the hardware. 
    At this point, you may setup your DOS game with the settings which you 
    have just configured.

    Also, if you have a Wave Table Device on board or attached to your
    sound card, you should also follow the recommended steps above but
    this time check on the "OPTi Plug-N-Play MPU-401" device settings
    instead. You will need it's current settings if you wish to enable
    General MIDI support in your DOS games.

    To ensure an ideal environment for DOS games, it is recommended that
    you modify the Idle Sensitivity property of your DOS Game environment
    to High. To do this, press the ALT+ENTER keys to change to a DOS Box
    Window (if not already in a Windowed session) and click on the top left
    hand corner of the DOS Box Window. A drop down menu will appear and
    at which point you should select Properties. Select the Misc tab and
    proceed to modify the above mentioned property.



HOT-KEY SUPPORT under WINDOWS 95 DOS BOX

    The following are the Hot-Keys and their associated channel controls.

    <CNTRL>+<ALT>+M     = Decrease Master Volume
    <SHIFT>+<ALT>+M     = Increase Master Volume
    <CNTRL>+<SHIFT>+M   = Mute Master Volume

    <CNTRL>+<ALT>+V     = Decrease Voice (Digital Sound) Volume
    <SHIFT>+<ALT>+V     = Increase Voice (Digital Sound) Volume
    <CNTRL>+<SHIFT>+V   = Mute Voice (Digital Sound) Volume

    <CNTRL>+<ALT>+F     = Decrease FM Music Volume
    <SHIFT>+<ALT>+F     = Increase FM Music Volume
    <CNTRL>+<SHIFT>+F   = Mute FM Music Volume



FULL-DUPLEX DUAL-DMA SUPPORT

    To enable Dual-DMA channel operation for simultaneous playback and
    recording, please ensure the following:
   
    1. The DMA resource settings under Device Manager must be different
       and paired as follows: 
                              
                Playback DMA:  0    1    3
               Recording DMA:  1    0    0

    2. The frequency format (eg. 11KHz, 22KHz..) must be the same during
       simultaneous playback and recording.
                              
    3. Full-Duplex is only supported if you have CS4231/CS4248 Class CODECs
       interfaced with the 82C925 PnP Audio Controller.



KARAOKE SUPPORT

    The customizeable option for supporting Karaoke Sing-A-Long basically
    turns on the LoopBack channel of the AD1848 class CODEC as well as
    forcing the input MUX to Microphone. This will ensure that the ADC
    signal is properly fed back to the output channel for amplification
    using the DAC volume control. The following options may be specified 
    in the CUSTOM.AddReg section of the INF file.

    To enable support for Karaoke Sing-A-Long, the following must be
    specified:

    ..,Karaoke_Src_Name,,"Voice"          


    To customize default settings for the Mic input gain plus the Loopback 
    attenuation, the following must be specified:

    ..,"LeftKaraokeMicVol",1,0080        // Low Byte then High Byte
    ..,"RightKaraokeMicVol",1,0080       
    ..,"KaraokeLoopBackVol",1,FFFF       

    Valid range is from 0000 -> FFFF ( 0 to 64K )



MIXER CUSTOMIZATION

    Mixer driver customization info should be specified in the SND925P.INF
    file which is located in the installation diskette and is required by
    Windows 95 during installation of the drivers. 

    By default, this file instructs the Mixer driver not to support
    any customizations and only the manufacturer's default channel
    mappings and controls are supported.

    To enable mixer customizations, proceed to the [CUSTOM.AddReg]
    section in this file and modify the "Default_Codec_Mapping"
    field from "Yes" to "No". This tells the mixer driver not to
    use the manufacturer's default mixer mappings but to expect
    customized channels mappings and controls instead.


    TYPE 1) Channel Mapping Customization

      The following are defaults:
      ..,AUX1_Src_Name,,"CD"                // For AUX 1 Channel
      ..,AUX2_Src_Name,,"Synth"             // For AUX 2 Channel
      ..,DAC_Src_Name,,"Wave"               // For LOC and ROC channels
      ..,MIX_Src_Name,,"Mix"                // For loopback Mix Channel

      ..,Karaoke_Src_Name,,"Voice"          // For enabling Karaoke


      Below are supported only if you have the extended CODEC on board
      such as CS4231 or AD1845.

      ..,LINE_Src_Name,,"Line"              // For LINE Channel

      ..,MIC_Src_Name,,"Mic"                // For Microphone Channel
                                            // Supported by AD1845 Only

      ..,MONOIN_Src_Name,,"Alarm"           // 

      Channel mapping customization allows renaming of a source to
      a different name thus changing the original assumed source
      mapping of the channel. 


    TYPE 2) Extra internal controls through existing H/W resource 
            - for controls using general purpose output bits of CODEC 
            or MC device.

      These internal controls are of the ON/OFF type controlled by a
      single toggling bit.

      The following are valid:

      ..,Total_Internal_Controls,1,n    // Total number of controls desired,
                                        // maximum is 3.
                                        // Default is assumed to be none.

      ..,Internal_Control_1_Name,,"SRS-3D"      // Name to call this control.

      ..,Internal_Control_1_OnVal,1,00 or 01    // What is the default ON bit.
                                                // Default is 01.

      ..,Internal_Control_1_By,,"XCTL0" | "XCTL1" | "GPOUT"

         // What bits to use for control based on the following
         // available on the default H/W.
         XCTL0 - OUT 0 bit located at index 10 of CODEC registers
         XCTL1 - OUT 1 bit located at index 10 of CODEC registers
         GPOUT - General Purpose Output bit at MC4

        
      ..,Internal_Control_2_Name,,""
      ..,Internal_Control_2_OnVal,1,00 or 01
      ..,Internal_Control_2_By,,""

        .
        .

      ..,Internal_Control_n_Name,,""
      ..,Internal_Control_n_OnVal,1,00 or 01
       ..,Internal_Control_n_By,,""


    TYPE 3) Extra external controls through external logic 
            (Requires DLL from third party).

      ..,Total_External_Controls,1,n  // Total number of controls desired,
                                      // maximum is 3.
                                      // Default is assumed to be none.

      ..,External_Control_1_Name,,"SRS-3D"    // Name to call this control.
      ..,External_Control_1_By,,"XCONT_1.DLL" // The accompanying DLL. Each
                                              // external control has it's own
                                              // unique DLL.

      ..,External_Control_2_Name,,""          // Name to call this control.
      ..,External_Control_2_By,,"XCONT_2.DLL"

      ..,External_Control_3_Name,,""          // Name to call this control.
      ..,External_Control_3_By,,"XCONT_3.DLL"


      Each external control has it's own set of exported functions for 
      the driver to call. For example, external control 1 will have the
      following 3 functions:

                XControl_1_Init();
                XControl_1_On();
                XControl_1_Off();

      The accompanying DLL must export these functions exactly as 
      named above.



    ** NOTES **

    1) Internal and External Controls must be of the ON/OFF control types; 
       any other types are not supported for now.

    2) In order to make use of the ON/OFF controls in the Volume Control
       application bundled with Windows 95, you will have to enable the 
       "Advance Controls" option under the "Properties" menu item.

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