DOCUMENT:Q137363 17-DEC-2000 [win95x] TITLE :Problems with ATI Mach32 Video Adapter on MCA Computer PRODUCT :Microsoft Windows 95.x Retail Product PROD/VER: OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows 95 ------------------------------------------------------------------------------- SYMPTOMS ======== When you use an ATI Graphics Ultra Pro (Mach32) video adapter in a Microchannel (MCA) computer, the Windows 95 icons, menu arrows, and minimize and maximize buttons may not appear in Windows 95. You may also experience screen redraw problems when you use an 800 x 600 x 256 color resolution with this video adapter. RESOLUTION ========== To work around this problem, follow these steps: 1. Use any text editor (such as Notepad) to edit the System.ini file in the Windows folder. Add the following line to the [Display] section of the file: MemMapRegs=0 After you add this line, save and then close the System.ini file. 2. Change the hardware jumper on the video adapter to enable VGA mode, and then disable the on-board VGA controller on the motherboard. For information about configuring the video adapter and motherboard, please refer to each product's documentation. MORE INFORMATION ================ Adding the "MemMapRegs=0" line to the System.ini file disables the use of memory-mapped I/O for the adapter, which may be necessary for MCA computers. ====================================================================== Keywords : Technology : kbWin95search kbZNotKeyword3 ============================================================================= 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.