DOCUMENT:Q138738 08-AUG-2001 [winnt] TITLE :VESA Local Bus Device Conflicts in Windows NT PRODUCT :Microsoft Windows NT PROD/VER: OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Windows NT Workstation versions 3.5, 3.51 - Microsoft Windows NT Server versions 3.5, 3.51 ------------------------------------------------------------------------------- SUMMARY ======= When you use VESA local bus devices in a Windows NT computer with a fast processor, one of the following STOP error messages may appear: STOP 0x0000000A IRQL_NOT_LESS_OR_EQUAL STOP 0x0000007F UNEXPECTED_KERNEL_MODE_TRAP STOP 0x00000050 PAGE_FAULT_IN_NONPAGED_AREA RESOLUTION ========== To correct this problem, do one of the following: - Disable the external cache on the computer. Some BIOS manufacturers include tuning parameters in the CMOS setup. -or- - Add wait states to the L2 cache in the computer CMOS setup. This adjustment may compensate for slower devices. For detailed information on the hardware, contact your computer manufacturer. MORE INFORMATION ================ A maximum of three VESA local (VL) bus connections can reside on a motherboard. Each slot contains up to one VL-bus device. For example, if a VL-bus device such as a video controller physically resides on the motherboard, only two VL-bus slots are then allowed in the system. The following table lists recommended maximum number of slots at various buffered or unbuffered speeds: CPU Speed Unbuffered Buffered -------------------------------------------------------------- Less or Equal to 33 MHz 2 slot/2 device 3 slot/3 device At 40 MHz 1 slot/2 device not recommended Greater or Equal to 50 MHz 0 slot/2 device not recommended Additional query words: prodnt ====================================================================== Keywords : Technology : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNT350search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbWinNTSsearch kbWinNTS351 kbWinNTS350 kbWinNTS351search kbWinNTS350search ============================================================================= 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 2001.