DOCUMENT:Q74636 17-DEC-2000 [msdos] TITLE :A20 Hardware Error Installing Windows 3.0 on AST Premium PRODUCT :Microsoft Disk Operating System PROD/VER:MS-DOS:5.x OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft MS-DOS operating system versions 5.0, 5.0a ------------------------------------------------------------------------------- SYMPTOMS ======== The Microsoft Windows version 3.0 Setup program may hang on disk #2 when you install Windows under Microsoft MS-DOS version 5.0 on an AST Premium 80386 machine when the message "A20 Hardware Error" is displayed on the screen. WORKAROUND ========== If this error occurs, check the CONFIG.SYS file for the line "DOS=high." If it exists, change it to "DOS=low", and remove any third-party device drivers such as ASTEMM.SYS. Reboot the machine to have the change take effect. Begin the Windows Setup program again. Additional query words: 5.00 ====================================================================== Keywords : Technology : kbMSDOSSearch kbMSDOS500 kbMSDOS500a Version : MS-DOS:5.x ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2000.