    AST RESEARCH, INC.        TECHNICAL BULLETIN # 1340          6-17-96

    TITLE: Crystal Sound Drivers for WinNT 3.51

    SUMMARY

       The Crystal sound drivers for Windows NT 3.51 may not work.

       This issue applies to all systems using the Crystal CS4232 audio
       chipset.

    ISSUE

       The User's Manual states that the configuration for the sound card
       is IRQ5, I/O 220, and DMA 1, however, these settings may not be
       valid.  The above configuration may cause the system to hang.

    BACKGROUND

       Crystal Semiconductor's new Sound Blaster emulation code was not
       implemented.

    ACTION

       Update the Bravo MS system BIOS to release 1.05 (p/n 05558-310) or
       greater and the Windows NT Crystal Semiconductor's sound drivers
       (p/n 912454-032) to release 1.10 or greater.

       File 05558310.EXE, Bravo MS flash BIOS release 1.05, and file
       12454032.EXE, Crystal Semiconductor's CS4232 driver release 1.10
       for Windows NT are available from any of AST's On-Line! services
       including:

         AST WWW Site:  http://www.ast.com
         AST On-Line! BBS*:  See IB0001.TXT
         CompuServe:  GO: ASTFORUM

         * Refer to IB0001.TXT for a list of AST's international BBS
           numbers.

       To decompress this file, create a temporary directory on your
       hard drive, copy the downloaded file to that directory, and run
       the file.

    NOTES

       For additional information on the Bravo MS BIOS, see Software
       Bulletin # 0249.  For additional information on the Crystal
       Semiconductor's CS4232 sound drivers, see Software Bulletin # 0253.

    TAN N/A

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