                                                             Last Revised
    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1749          08/13/97

    TITLE:  ESS1788 Drivers and AST Adventure! 4xx

    ISSUE

       When the user updates the AST Adventure! 4xx system with the
       ESS1788 drivers obtained from ESS’s Web page, the user is unable
       to calibrate the joystick. The drivers will successfully load,
       but the joystick icon under Control Panel will not function at
       all. These generic drivers are not compatible with the Advantage!
       4XX systems.

       This issue affects the following systems: 503303, 503316, and
       503319.

    BACKGROUND

       N/A

    ACTION

       To restore the original sound drivers that shipped with the
       system, perform the following steps:

       1.  Make sure Audio in system CMOS is set to "Built-in".

       2.  Create the ESS1788 sound driver diskette from the
           "Windows 95 Create System Diskette" utility located
           in the System Tools menu option.

       3.  Remove the ESS1788 sound device from the Device
           Manager.

       4.  Delete the "Essesscwt2.INF file located in the
           \Windows\Inf\Other subdirectory. Note: When using
           Explorer, make sure the view is set to show all
           hidden files.

       5.  Delete the files listed below from the
           \Windows\System subdirectory:

              ES1788.DRV
              ES1788.VXD
              ESFM.DRV
              ESSMPU.DRV

       6.  Shutdown and restart the system.

       7.  The system will have the "New Hardware Found Wizard"
           appear during Windows 95 initialization.

       8.  The "Update Device Driver Wizard" showing unknown
           device will appear. Insert the ESS1788 driver
           diskette created in step 2 into drive A: and click
           next.

       9.  The system will find the ESS ES1788 Plug and Play
           AudioDrive driver. Click the  button.

       10. When the "Insert Disk Labeled Install Disk 1" window
           appears, click OK. When the "Copying Files" window
           appears prompting for the ES1788.DRV on Install Disk
           1, change the path to be A:\ and click the
           button.

       11. The files will then be copied and the driver
           installation will be complete. Click the joystick
           icon in the Control Panel to calibrate the joystick.

    NOTES

       AST can only assure proper system operation if the customer uses
       AST-supplied drivers.

    TAN TPR 100AT

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