DOCUMENT:Q74209 22-NOV-1999 [msdos] TITLE :Why MEM /C Does Not Show UMB Information PRODUCT :Microsoft Disk Operating System PROD/VER:MS-DOS:5.0 OPER/SYS: KEYWORDS: ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft MS-DOS operating system version 5.0 ------------------------------------------------------------------------------- SUMMARY ======= If you type the command "MEM /C" (without the quotation marks) and receive information only about the conventional portion of memory, one of two things is occurring: - The command is being given in a virtual machine, such as the MS-DOS prompt under Windows 3.0. -or- - There are no upper memory blocks (UMBs) available or in use. MORE INFORMATION ================ In order for upper memory block information to be displayed, the following must be in your CONFIG.SYS file: - UMB must be specified on the DOS=HIGH or DOS=LOW line to tell MS-DOS to make UMBs available. For example: dos=high,umb - EMM386 must be loaded in the CONFIG.SYS file, which will map some of the available extended memory into the upper memory area (UMA) as usable UMBs. For UMB support, either the RAM or NOEMS switch must be used. For example: device=c:\dos\emm386.exe noems Note: EMM386.EXE requires that HIMEM.SYS be loaded. For more information on the use of upper memory blocks, see pages 313-330 and 605-609 of the version 5.0 "Microsoft MS-DOS User's Guide and Reference," or query on the following words: "requirements" (without the quotation marks) and "UMB" (without the quotation marks) and "support" (without the quotation marks) and "MS-DOS 5.0" (without the quotation marks) Additional query words: 5.00 ====================================================================== Keywords : Technology : kbMSDOSSearch kbMSDOS500 Version : MS-DOS:5.0 ============================================================================= 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.