DOCUMENT:Q72595 03-DEC-1999 [msdos] TITLE :Using Weitek Math Coprocessor with MS-DOS PRODUCT :Microsoft Disk Operating System PROD/VER:MS-DOS:5.0,5.0a,6.0,6.2,6.21,6.22 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft MS-DOS operating system versions 5.0, 5.0a, 6.0, 6.2, 6.21, 6.22 ------------------------------------------------------------------------------- SUMMARY ======= The default setting in EMM386.EXE for the Weitek coprocessor is Off. If the switch for the Weitek coprocessor is not set to On when EMM386.EXE is loaded and the machine contains a Weitek coprocessor board, the machine may stop responding (hang) on boot. MS-DOS must be loaded low if the W=ON switch is specified for EMM386.EXE. If Weitek support is enabled, EMM386 will attempt to allocate the high memory area (HMA) and map the memory locations used by the Weitek coprocessor to this location. If MS-DOS is already loaded high, this will not be possible. NOTE: Weitek can be used in conjunction with the 80387 math coprocessor, although special code must be written to use each device. MORE INFORMATION ================ The WTL 1167 is a set of three chips found on the Weitek coprocessor board that are used as a replacement for the Intel 80387. To use EMM386.EXE on a machine with the Weitek coprocessor installed: 1. Add EMM386.EXE to the CONFIG.SYS file as follows: device=c:\dos\emm386.exe w=on This example assumes that EMM386.EXE is located in the C:\DOS directory. 2. If the EMM386 device driver has been loaded in CONFIG.SYS, you can toggle Weitek coprocessor support on and off by typing the following at the DOS prompt: " emm386 w=on " (without the quotation marks) -or- " emm386 w=off " (without the quotation marks) The following machines may be shipped with the Weitek coprocessor board installed: Compaq Deskpro 386/20e, Model 110 HP Vectra RS/16 PC HP Vectra RS/20 PC Additional query words: 6.22 5.00 5.00a 6.00 6.20 6.21 ====================================================================== Keywords : Technology : kbMSDOSSearch kbMSDOS621 kbMSDOS622 kbMSDOS620 kbMSDOS600 kbMSDOS500 kbMSDOS500a Version : MS-DOS:5.0,5.0a,6.0,6.2,6.21,6.22 ============================================================================= 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 1999.